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Talks and Posters

Publications
19 Invited talks

2007

  • 151. N. Østgaard, A. L. Borg, A. Åsnes, A. Pedersen, M. Øieroset, T. Phan and K. Snekvik. What are the ionospheric signatures of magnetotail reconnection? AGU fall meeting, San Francisco, USA, 2007.

  • 150. T. Gjesteland, N. Østgaard, P. H. Connell, J. Stadsnes Monte Carlo simulation of the temporal behavior of Terrestrial Gamma ray Flashes AGU fall meeting, San Francisco, USA, 2007.

  • 149. K. M. Laundal, N. Østgaard. Solar wind pressure as a cause for persistent proton precipitation AGU fall meeting, San Francisco, USA, 2007.

  • 148. A. Åsnes, M. G. G. T. Taylor, A. L. Borg, C. P. Escoubet, H. Laakso, A. Masson, N. Østgaard, P. Daly, A.N. Fazakerley, E. Lucek. Cluster observations of electron acceleration in near-Earth reconnection events. AGU fall meeting, San Francisco, USA, 2007.

  • 147. A. Orr, R. Nasca, M. Tacconi, S. De Mey, O. Hartnack, P. Davidsen, J.S. Pedersen, S.E. Jorgensen, O. Mikkelsen, K. Pedersen, O. Gloe-Jakobsen, P. L. Thomsen, J. Rodrigo, T. Neubert, N. Østgaard, V. Reglero, E. Blanc ESA's Atmosphere-Space Interactions Monitor (ASIM) for the ISS, the 3rd International Symposium on Physical Sciences in Space (ISPS 2007), October 2007, Nara, Japan.

  • 146. N. Østgaard . De mystiske tvillingene - Nordlys og Sørlys, Invited talk Forskningsadgene, Bergen, Sept 22, 2007.

  • 145. A. Helland, N. Østgaard, K. Ullaland, A. O. Solberg, K. Njøten, V. Reimundo. ASIM, 18th symposium on European Rocket and balloon programmes and related resarch, June 2007, Visby, Sweden.

  • 144. K. Olafsson , N. Østgaard, E. Tanskanen The Spce Suitcase - instruments for exploring the near-Earth space from the classroom IHY workshop, Torino, Italy, June, 2007.

  • 143. N. Østgaard . IPY-ICESTAR. Invited talk Norway-Japan Symposium on Polar, Space and Climate, May 29-30, Tokyo, Japan

  • 142) Anil Bhardwaj, Ronald F. Elsner, G. Randall Gladstone, Graziella Branduardi-Raymont, Konrad Dennerl, Carey M. Lisse, Thomas E. Cravens, J. Hunter Waite Jr., Nikolai Østgaard, Bradford J. Wargelin, Ina Robertson, Peter Beiersdorfer, Steven L. Snowden, Vasili Kharchenko. Solar System X-rays: Relationship with Solar X-rays and Solar Wind. Asia Oceania Geosciences Society, 4th Annual Assembly, Bangkok, July 30 - August 4, 2007.

  • 141. N. Østgaard, A. L. Borg, A. Åsnes, A. Pedersen, M. Øieroset and T. Phan. What are the ionospheric signatures of magnetotail reconnection? Invited. IUGG meeting, Perugia, July, 2007.

  • 140. J. Stadsnes, C. Sætre, N. Østgaard, C. A. Barth, S. M. Bailey, G. A. Germany, J. W. Gjerloev. Energetic Particles and Geomagnetic Storm Influence on Chemical and Dynamical Processes in the Polar Stratosphere and Mesosphere. Invited, IUGG meeting, Perugia, July, 2007.

  • 139. J. Stadsnes, C. Sætre, N. Østgaard, C. A. Barth, S. M. Bailey, G. A. Germany, J. W. Gjerloev. Energetic Particles and Geomagnetic Storm Influence on Chemical and Dynamical Processes in the Polar Stratosphere and Mesosphere. AGU, Mexico, May, 2007.

  • 138. T. Gjesteland , N. Østgaard and J. Stadsnes. Monte Carlo Simulation of Terrestrial Gamma ray Flashes production altitude. EGU meeting in Vienna, April 2007.

  • 137. K. Laundal and N. Østgaard Global observations of proton precipitation during the 21.-25. October 2001 geomegnetic storm. EGU meeting in Vienna, April 2007.

  • 136. J. R. Flatjord and N. Østgaard The characteristics of theta aurora and implications for its production mechanisms. EGU meeting in Vienna, April 2007.

  • 135. K. Snekvik , R. Nakamura, S. Haaland, N. Østgaard A statistical survey of the electric field Z(GSM) component in the plasma sheet based on Cluster data. EGU meeting in Vienna, April 2007.

  • 134. N. Østgaard Conjugate studies, Invited review talk at the IPY-ICESTAR kick-off meeting in Helsinki, Finland, February, 2007.

  • 133. N. Østgaard Conjugate studies, Invited talk at the 2. International Symposium of KuaFu at Hainan, China, 15-19 January, 2007.

    2006

  • 132. N. Østgaard, J. Stadsnes, T. Gjesteland, Paul H. Conell. TGF production altitude - revisiting the BATSE spectra in view of upcoming missions AGU fall meeting, San Francisco, December, 2006.

  • 131. N. Østgaard . Imaging the upper atmopshere from space. Invited talk at the Transatlantic Science Week 2006, 'Arctic Meltdown Global Effects', October 2-4, 2006, Carnegie Institution, Washington DC., USA.

  • 130. N. Østgaard and J. Stadsnes. X-ray spectra measured by MXGS can reveal the production altitude of TGFs. ASIM Science workshop, ESTEC, June, 2006.

  • 129. N. Østgaard, S. B. Mende, H. U. Frey, J. B. Sigwarth A. Aasnes, J. Weygand. ICESTAR: Auroral conjugacy studies. SCAR meeting, Hobart, Australia, July 2006.

  • 128. T. Neubert , N. Østgaard, Carl Budz-Jorgensen, Irfan Kuvvetli, Victor Reglero, Eric Donovan, Serge Soula, Elisabeth Blanc. The Atmosphere-Space Interactions Monitor (ASIM) for the International Space Station. 57th International Astronautical Congress, October 2006.

  • 127. N. Østgaard , S. B. Mende, H. U. Frey, J. B. Sigwarth, A. Aasnes, J. Weygand. Auroral conjugacy studies based on global imaging. Invited talk at the National Institute of Polar Reasearch, Tokyo, Japan,, August 2006.

  • 126. N. Østgaard , S. B. Mende, H. U. Frey, J. B. Sigwarth, A. Aasnes, J. Weygand. Hemispherical asymmetries derived from conjugate auroral imaging. Invited talk at the Western Pacific Geophysical Meeting, Beijing, China, July 2006.

  • 125. C. Sætre , J. Stadsnes, N. Østgaard, C. A. Barth, S. M. Bailey, G. A. Germany, D. N. Baker. Chemical effects of electron precipitation - Modelling thermospheric nitric oxide. COSPAR meeting, Beijing, July, 2006.

  • 124. J. Stadsnes , N. Østgaard,C. Sætre, A. Aasnes. Global observations of the dynamics of energetic electron precipitation during substorms. COSPAR meeting, Beijing, July, 2006.

  • 123. J. Stadsnes , A. Aksnes, C. Sætre, N. Østgaard, C.A. Barth, S.M. Bailey, G. Germany. Satellite remote mapping of the precipitation of energetic electrons and their effects on the Earth's upper atmosphere. AOGS 2006 meeting in Singapore 10-14 July, 2006.

  • 122. N. Østgaard , S. B. Mende, H. U. Frey, J. B. Sigwarth, A. Aasnes. Substorm onset asymmetries derived from conjugate auroral imaging EGU meeting, Vienna, Austria, April, 2006.

  • 121. N. Østgaard , K. Kauristie, A. Weatherwax, ICESTAR A connection between IHY and IPY. Invited talk at the EGU meeting, Vienna, Austria, April, 2006.

  • 120. C. Sætre , J. Stadsnes, N. Østgaard, C. A. Barth, S. M. Bailey, G. A. Germany, D. N. Baker. Electron precipitation - Energy deposition and chemical effects in the lower thermosphere. EGU meeting, Vienna, Austria, April, 2006.

  • 119. T. Neubert , N. Østgaard, Carl Budz-Jorgensen, Irfan Kuvvetli, Victor Reglero, Elisabeth Blanc. The Atmosphere-Space Interactions Monitor (ASIM) for the International Space Station. EGU meeting, Vienna, Austria, April, 2006.

  • 118. N. Østgaard Remote sensing of X rays to study characteristics of electron precipitation. Invited talk at 2nd International Workshop on Riometry, Banff, Canada, March 2006.

  • 117. N. Østgaard , S. B. Mende, H. U. Frey, J. B. Sigwarth, A. Aasnes. Conjugate imaging of substorms. Invited talk at the ICS-8, March, Calgary, 2006.

  • 116. N. Østgaard and T. Immel. Global imaging to predict space weather. Invited talk at the SCOSTEP, STP-11 in Rio de Janeiro, Brazil 6-10 March, 2006.

  • 115. N. Østgaard , S. B. Mende, H. U. Frey, J. B. Sigwarth. Auroral conjugacy studies, Invited talk at the Yosemite meeting, California, February, 2006.

  • 114. N. Østgaard , S. B. Mende, H. U. Frey, J. B. Sigwarth. Simulaneous imaging of the reconnection spot in the opposite hemispheres during northward IMF, Invited talk at the IHY European Assembly, January 2006 .

    2005

  • 113. N. Østgaard and J. Stadsnes. Production altitude effects on the X-ray spectrum from TGFs. AGU fall meeting in San Francisco, 2005.

  • 112. N. Østgaard , Conjugate auroral observations, Now and in the future. Invited talk at the Vegard symposium, Oslo, Norway, October 14, 2005.

  • 111. N. Østgaard , S. B. Mende, H. U. Frey, J. B. Sigwarth. Global imaging of Auroral Phenomena in the Conjugate Hemispheres. Invited talk at the IAGA 2005 Scientific Assembly, Toulouse, France, 18-29 July, 2005.

  • 110. A. Aksnes, J. Stadsnes, N. Østgaard, G. A. Germany, R. R. Vondrak, K. Oksavik, A. Brekke, U. P Lovhaug. Ionospheric global conductance maps from remote sensing of UV and X-ray emissions. Invited talk at the IAGA 2005 Scientific Assembly, Toulouse, France, 18-29 July, 2005.

  • 109. N. Østgaard and J. Stadsnes. Production altitude effects on the X-ray spectrum from TGFs. Invited talk at the midterm review and science meeting of the European Union Research Training Network, Coupling of Atmopsheric Layers, Crete, Greece, June, 2005.

  • 108. Anil Bhardwaj , Ron Elsner, Randy Gladstone, Tom Cravens, Hunter Waite, Graziella Branduardi-Raymont, Nikolai Ostgaard, Konrad Dennerl, Casey Lisse, Vasili Kharchenko, Ronnie Hoekstra, Peter Beiersdorfer. A Comparative View of X-rays from the Solar System. AGU spring meeting, New Orleans, May, 2005.

  • 107. Nesse H. Stadsnes J., Paxton L., Saetre C., Aksnes A. , Aasnes A., Ostgaard N. Effects on the O/N2-ratio caused by ionospheric heating during geomagnetic storms. EGU meeting, Vienna, Austria, April, 2005.

  • 106. C. Sætre , C. A. Barth, J. Stadsnes, N. Østgaard, D. N. Baker, A. Aksnes, H. Nesse, S. M. Petrinec, S. M. Bailey. Comparisons of electron energy flux derived from X-ray bremsstrahlung measurements and from a photochemical model for nitric oxide. EGU meeting, Vienna, Austria, April, 2005.

  • 105. A. L. Borg, N. Østgaard, A. Pedersen. Studies of an X-line passage 2 October 2002 using multipoint Cluster and Polar imaging data, EGU meeting, Vienna, Austria, April, 2005.

  • 104. A. Aksnes, J. Stadsnes, A. Brekke, N. Østgaard, G. A. Germany, R. R. Vondrak, K. Oksavik, U. P Lovhaug. Height profiles of the ionospheric electron density derived from remote sensing of UV- and X-ray emissions and measured by EISCAT radar, EGU meeting, Vienna, Austria, April, 2005.

  • 103. N. Østgaard, J. Stadsnes, J. Moen, J. C. Gerard. A double spacecraft imaging mission to study reconnection and ion outflow EGU meeting, Vienna, Austria, April, 2005.

  • 102. N. Østgaard, S. B. Mende, H. Frey, J. B. Sigwarth. Auroral signatures of lobe reconnection observed simultaneously in the conjugate hemispheres. EGU meeting, Vienna, Austria, April, 2005.

    2004

  • 101. A. Aasnes, Reiner Friedel, Michelle Thomsen, Tom Cayton, Nikolai Ostgaard, Johan Stadsnes. Statistical pitch angle properties of substorm injected electron clouds and their relation to dawnside energetic electron precipitation. AGU meeting, San Francisco, USA, Dec, 2004.

  • 100. R. Gladstone, R. Elsner , A. Bhardwaj, N. Østgaard, H. Waite, Jr., T. Majeed, S. W. Chang, T. E. Cravens, A. E. Metzger. Chandra observations of soft X-ray emissions from Earth and Jupiter. AGU meeting, San Francisco, USA, Dec, 2004.

  • 99. N. Østgaard, S. B. Mende, H. Frey, T. J. Immel, J. B. Sigwarth, L. A. Frank. The Cusp Aurora in the Conjugate Hemispheres of the Earth. AGU meeting, San Francisco, USA, Dec, 2004.

  • 98. C. Sætre , J. Stadsnes, H. Nesse, A. Aksnes, S. M. Petrinec, C. A. Barth, D. N. Baker, R. R. Vondrak and N. Østgaard, Direct comparisons of energetic electron precipitation and nitric oxide in the upper atmosphere during geomagnetic storms. AGU meeting, San Francisco, USA, Dec, 2004.

  • 97. A. Bhardwaj, R. F. Elsner , G. R. Gladstone, J. H. Waite, Jr., T. E. Cravens, N. Østgaard, S. W. Chang, A. E. Metzger, T. Majeed. First terrestrial soft X-ray aurora observations by Chandra. Hunstville workshop, Alabama, USA, Nov. 2004.

  • 96. Pedersen, A.; Balogh, A.; Borg, A.L.; Holtet, J.; Lybekk, B.; Moen, J.; Oksavik, K.; Østgaard, N.; Svenes, K.; Soeraas, F. Electric and magnetic field and particle observations on Cluster combined with ground-based observations during substorms, ICS7-A-00083, ICs-7, March 21-27, 2004 Levi, Lapland, Finland

  • 95. Alexander Kozlovsky, Alexander Koustov, Vladimir Safargaleev, N. Østgaard. Response of magnetospheric electric fields and dayside auroras to a solar wind pressure pulse. SuperDARN-2004 workshop.

  • 94. T. J. Stubbs, Richard R. Vondrak, N. Østgaard, John B. Sigwarth and Louis Frank. Simultaneous observations of the auroral oval in both hemispheres under various conditions AGU meeting, Montreal, Canada, May, 2004.

  • 93. H.U. Frey , N. Østgaard, T.J. Immel, H. Korth, S.B. Mende, Seasonal dependence of localized, High Latitude Dayside Aurora (HiLDA), AGU meeting, Montreal, Canada, May, 2004.

  • 92. Immel, T. J., N. Ostgaard, D. J. Strickland, H. U. Frey, S. B. Mende, G. Lu IMAGE-FUV observations of the October-November 2003 flare and magnetic storm effects on Earth, AGU meeting, Montreal, Canada, May, 2004.

  • 91. H.U. Frey, G. Haerendel, S.B. Mende, T. Forrester, M. Thomsen, T.J. Immel, N. Ostgaard Sub-Auroral Morning Proton Spots (SAMPS) as a result of plasmapause-ring-current interaction, AGU meeting, Montreal, Canada, May, 2004.

  • 90. H.U. Frey, S.B. Mende, T.J. Immel, N. Ostgaard, T.D. Phan The combination of auroral imaging and spacecraft in-situ measurements for M-I coupling research, COSPAR, Paris, July, 2004.

  • 89. A. Kozlovsky,A. Koustov, V. Safargaleev, N. Østgaard,Response of dayside auroras and ionospheric plasma flows to a solar wind pressure pulse, AGU meeting, Montreal, Canada, May, 2004.

  • 88. N. Østgaard, S. B. Mende, H. Frey, T. J. Immel, L. A. Frank, J. B. Sigwarth, M. O Fillingim. IMF control of auroral phenomena in the conjugate hemispheres, AGU meeting, Montreal, Canada, May, 2004.

  • 87. O. Amm, A. Aksnes, J. Stadsnes, N. Østgaard, R. R. Vondrak, G. A. Germany, I. Sillanpää, Observations and analysis of ionospheric electrodynamics during a substorm recovery phase using the MIRACLE network, EGU meeting, Nice, France, April, 2004.

  • 86. A. Aksnes, J. Stadsnes, Asgeir Brekke, U. P Lovhaug, N. Østgaard, G. A. Germany, R. R. Vondrak. Comparing height profiles of the ionospheric electron density derived from remote sensing of UV- and X-ray emissions and from EISCAT radar data, EGU meeting, Nice, France, April, 2004.

  • 85. N. Østgaard, S. B. Mende, H. Frey, T. J. Immel, L. A. Frank, J. B. Sigwarth, M. O Fillingim. IMF control of the aurora in the conjugate hemispheres, EGU meeting, Nice, France, April, 2004.

  • 84. O. Amm , A. Aksnes, J. Stadsnes, N. Østgaard, R. R. Vondrak, G. A. Germany, and I. Sillanpää Observations and analysis of ionospheric electrodynamics during a substorm recovery phase using the MIRACLE network, Invited talk at ICS-7, Finland, March, 2004.

    2003

  • 83. G. K. Parks , M. Fillingim, E. S Lee, M. Spesojevic, M. Wilber, F. Mozer, N., Østgaard, K. Liou, C. I. Meng, J. Scudder, B. Giles, T. Moore, J. Wygant, N. Fox, J. Sigwarth, J. Spann, B. Blake, P. Chi, C. Russell, M. Goldstein A. Fazakerley, I. Dandouras, C. Vallat, H. Reme, P. Escoubet, A. Balogh, Featuring Particles and Fields from the Super Storms during October 24 to 29, 2003., AGU fall meeting, San Francisco, 2003.

  • 82. H.U. Frey H.U Frey, S.B. Mende, T.J. Immel, N. Østgaard, Response of the dayside aurora to the October/November storms, AGU fall meeting, San Francisco, 2003.

  • 81. O Amm, A Aksnes, J Stadsnes, N Ostgaard, R R Vondrak, G A Germany, G Lu, A Pulkkinen, I Sillanpaa, Mesoscale and semiglobal scale view of the ionospheric electrodynamics of auroral torches, AGU fall meeting, San Francisco, 2003.

  • 80. K. S. Garcia, P. H. Reiff, S. Naehr, H. Frey, J. Sigwarth, N. Østgaard, S. Mende, L. Frank, T. Hill, F. Toffoletto. Comparison of Rice Field Model to Simultaneous Conjugate Auroral Images , AGU fall meeting, San Francisco, 2003.

  • 79. N. Østgaard, S. B. Mende, H. Frey, T. J. Immel, L. A. Frank, J. B. Sigwarth IMF control of the theta aurora and substorm onset location in the conjugate hemispheres, AGU fall meeting, San Francisco, 2003.

  • 78. H.U. Frey, S.A. Fuselier, S.B. Mende, T.D. Phan, T.J. Immel, N. Ostgaard Investigation of cusp dynamics with IMAGE-FUV, AGU fall meeting, San Francisco, 2003.

  • 77. A. Aksnes, J. Stadsnes, Asgeir Brekke, U. P Lovhaug, N. Østgaard, G. A. Germany, R. R. Vondrak. Comparing height profiles of the ionospheric electron density derived from remote sensing of UV- and X-ray emissions and from EISCAT radar data, AGU fall meeting, San Francisco, 2003.

  • 76. H. Nesse , J. Stadsnes , C. J. Mertens , C. Saetre , A. Aasnes, A. Aksnes, N. Østgaard. Upper Atmosphere Temperature Effects of Energetic Electron Precipitation During Substorms, AGU fall meeting, San Francisco, 2003.

  • 75. T. J. Stubbs, Richard R. Vondrak, Nikolai Ostgaard, John B. Sigwarth Conjugate auroral observations under various interplanetary conditions, AGU fall meeting, San Francisco, 2003.

  • 74. A. T. Weatherwax, L. J. Lanzerotti, T. J. Rosenberg, R. Clauer, S. B. Mende, U. S. Inan, M.J. Engebretson, J. LaBelle, M. Lessard, K. Lynch, C. Maclennan, A. Ridley, D. L. Detrick, N. Petit, H. U. Frey, N. Østgaard, R. W. Sterling, J. H. Doolittle, H. Fukunishi, Polar Experiment Network for Geospace Upper-atmosphere Investigations (PENGUIn): A Vision for Global Polar Studies and Education, AGU fall meeting, San Francisco, 2003.

  • 73. N. Østgaard, J. I. Moen, S. B. Mende, H. U. Frey, P. Gallop, K. Oksavik. Reconnection rate determined from EISCAT VHF radar measurements and IMAGE FUV imaging from space. EISCAT 2003 Workshop, Menlo Park, California, USA, August 25-29, 2003.

  • 72. N. Østgaard, S. B. Mende, H. Frey, L. A. Frank, J. B. Sigwarth. Global conjugate imaging of a substorm by Polar and IMAGE., EGS/AGU, EAE03-A-02406, April 2003, Nice, France.

  • 71. S. B. Mende, H. U. Frey, N. Østgaard, D. S. Evans. The expansion of substorm auroras in local time., EGS/AGU, EAE03-A-02974, April 2003, Nice, France.

  • 70. H. U. Frey, S. Fusilier, S. B. Mende, N. Østgaard. Proton aurora at the cusp footprint during southward IMF, EGS/AGU, EAE03-A-07221, April 2003, Nice, France.

  • 69. A. Aksnes, J. Stadsnes, G. Lu, N. Østgaard, R. R. Vondrak, D. L. Detrick, T. J. Rosenberg, G. A. Germany, M. Schulz, Effects of energetic electrons on the electrodynamics in the ionosphere. EGS/AGU, EAE03-A-02575, April 2003, Nice, France.

  • 68. A. Aksnes, O. Amm, J. Stadsnes, N. Østgaard, R. R. Vondrak, G. A. Germany, A. Pulkkinen, I. Sillanpaa. Comparison of two Different Techniques to Derive the Ionospheric Conductances., EGS/AGU, EAE03-A-02295, April 2003, Nice, France.

  • 67. O. Amm, A. Aksnes, J. Stadsnes, N. Ostgaard, R.R. Vondrak, G. A. Germany, G. Lu, A. Pulkkinen, I. Sillanpää, Mesoscale and semiglobal scale view of the ionospheric electrodynamics of auroral torches., EGS/AGU, EAE03-A-02625, April 2003, Nice, France.

  • 66. H. Nesse, J. Stadsnes, A. Aksnes, C. Sætre, A. Aasnes, P. C. Anderson, A. Christensen, L. Paxton, N. Østgaard. Atmospheric effects of energetic electron precipitation during substorms., EGS/AGU, EAE03-A-13231, April 2003, Nice, France.

    2002

  • 65. N. Østgaard, J. Moen, S. B. Mende, H. U. Frey, T. J. Immel, P. Gallop, K. Oksavik. Estimates of magnetotail reconnection rate based on IMAGE FUV and EISCAT measurements, AGU fall meeting, San Francisco, 2002 USA.

  • 64. B. Ursin, J. Stadsnes, M. Brittnacher, G.K. Parks, R. Friedel, N. Østgaard, The Global Development of Energetic Electron Precipitation During the Storm Sudden Commencement on September 24, 1998., AGU fall meeting, San Francisco, 2002 USA.

  • 63. O. Amm, A. Aksnes, J. Stadsnes, N. Østgaard, T. J. Rosenberg, D. L. Detrick, G. A. Germany, R. R. Vondrak, I. Sillanpää Comparison of two Different Techniques to Derive the Electric Current Density in the Ionosphere, AGU fall meeting, San Francisco, 2002 USA.

  • 62. A. Aksnes, J. Stadsnes, G. Lu, A. D. Richmond, N. Østgaard, T. J. Rosenberg, D. L. Detrick, G. A. Germany, R. R. Vondrak, M. Schulz, The electrodynamics in the ionosphere during substorms, AGU fall meeting, San Francisco, 2002 USA.

  • 61. H.U. Frey, S.B. Mende, T.J. Immel, G. Lu, N. Østgaard, Global cause of localized high latitude aurora, AGU fall meeting, San Francisco, 2002 USA.

  • 60. N. Østgaard, S. B. Mende, H. U. Frey, G. R. Gladstone, Neutral hydrogen density profiles derived from geocoronal imaging, poster at the COSPAR meeting, Houston, Texas, October 2002 USA.

  • 59. N. Østgaard, Hydrogen density profiles derived from geocoronal imaging. Seminar, University of California, Berkeley, USA, September 2002.

  • 58. N. Østgaard, Hydrogen density profiles derived from geocoronal imaging. Guest lecture, Lockheed Martin Advanced Technology Center, Palo Alto, September 2002.

  • 57. A. Bhardwaj, G. R. Gladstone, R. F. Elsner , J. H. Waite, Jr., D. Grodent, W. S. Lewis, F. J. Crary, M. C. Weisskopf, R. R. Howell, R. E. Johnson, P. G. Ford, A. E. Metzger, K. C. Hurley, E. D. Feigelson, G. P. Garmire, T. Majeed, J. T. Clarke, D. T. Young, M. K. Dougherty, S. A. Espinosa, T. E. Cravens, A. F. Tennant, J.-M. Jahn, N. Østgaard, Soft X-Ray Emissions from Planets and Moons, Conference: ESLAB 36: Earth-like Planets and Moons, Noordwijk, June 3-8, 2002.

  • 56. N. Østgaard, Hydrogen density profiles derived from geocoronal imaging. Guest lecture, University of Bergen, Norway, May 2002.

  • 55. N. Østgaard, Hydrogen density profiles derived from geocoronal imaging. Guest lecture, University of Oslo, Norway, May 2002.

  • 54. N. Østgaard, S. B. Mende, H. U. Frey, G. R. Gladstone, Neutral hydrogen density profiles derived from geocoronal imaging, poster at AGU spring meeting, Washington DC, May 2002.

  • 53. A. Aksnes, J. Stadsnes, M. Lester, N. Østgaard, T. J. Rosenberg,, G. Germany , Ionospheric electric fields, conductances and currents during geomagnetic substorms, ICS-6, April 2002, Seattle, USA .

  • 52.T. Christensen, N. Østgaard, T. J. Rosenberg, D. Detrick, G. A. Germany and P. Stauning, Conjugate high-intensity energetic electron precipitation at high latitude, EGS, April 2002, Nice, France.

  • 51. A. Aksnes, J. Stadsnes, M. Lester, S. Milan, N. Østgaard, T. J. Rosenberg, D. L. Detrick, G. A. Germany, R. R. Vondrak, , M. Schulz, Electrodynamical parameters during a geomagnetic substorm, EGS, April 2002, Nice, France .

  • 50. A. Aksnes, J. Stadsnes, N. Østgaard, R. R. Vondrak, D. Detrick, T. J. Rosenberg, G. Germany, M. Schulz, Instantaneous ionospheric global conductance maps during substorms, EGS, April 2002, Nice, France.

  • 49. N. Østgaard, S. B. Mende, H. U. Frey, G. R. Gladstone, Neutral hydrogen density profiles derived from geocoronal imaging, poster at the Yosemite 2002, Magnetospehric Imaging Workshop, February 2002, California, USA.

    2001

  • 48. T. Christensen, N. Østgaard, T. J. Rosenberg, P. Stauning, G. A. Germany, J. Watermann, A conjugate study of localized high-energy precipitation event in the evening sector, poster at the AGU fall meeting, Dec 2001, San Francisco, USA.

  • 47. J. W. Gjerloev, R. A. Hoffman, N. Østgaard, L. A. Frank and J. B. Sigwarth, The non-expansive auroral disturbance events. poster at the AGU fall meeting, Dec 2001, San Francisco, USA.

  • 46. A. Aksnes, J. Stadsnes, N. Østgaard, R. R. Vondrak, D. Detrick, T. J. Rosenberg, G. Germany, D. Chenette and D. Weimer, Global maps of electromagnetical parameters during substorms, talk at the AGU fall meeting, Dec 2001, San Francisco, USA.

  • 45. N. Østgaard, S. Mende, H. Frey, T. Immel, G. Germany, J. Stadsnes and R. R. Vondrak, The energy transport during substorms based on remote sensing techniques, solar wind measurements, and magnetic indices, talk at the AGU fall meeting, Dec 2001, San Francisco, USA.

  • 44. N. Østgaard, Recent results from PIXIE. Guest lecture, University of Bergen, Norway, Nov 2001.

  • 43. N. Østgaard, G. Germany, J. Stadsnes and R. R. Vondrak, Energy analysis of substorms based on solar wind measurements, derived auroral electron distribution and magnetic indices, poster at the IAGA meeting August 2001 in Hanoi, Vietnam.

  • 42. N. Østgaard, T. J. Rosenberg, D. Detrick, J. Stadsnes and R. R. Vondrak, High-latitude dayside X-ray emissions observed in the southern auroral region, talk at the IAGA meeting August 2001 in Hanoi, Vietnam.

  • 41. P. C. Anderson, N. Østgaard, J. Sigwarth, S. Cummer, Multispectral imaging results from the Polar spacecraft, invited talk at the AGU spring meeting, May-June 2001,Boston USA.

  • 40. A. Aasnes, J. Stadsnes, J. Bjordal, N. Østgaard, S. Håland, T. J. Rosenberg and D. Detrick, A detailed study of the energetic electron precipitation at substorm onset and expansion, poster at the AGU spring meeting, May-June 2001,Boston USA.

  • 39. A. Aksnes, J. Stadsnes, N. Østgaard, J. Bjordal, T. J. Rosenberg, D. Detrick, G. Germany and R. R. Vondrak, Global maps of Pedersen and Hall conductivities through a substorm, talk at the AGU spring meeting, May-June 2001,Boston USA.

  • 38. N. Østgaard, G. Germany, J. Stadsnes and R. R. Vondrak, Energy analysis of substorms based on remote sensing techniques, solar wind measurements, and magnetic indices, talk at the AGU spring meeting, May-June 2001,Boston USA.

  • 37. N. Østgaard, Recent results from PIXIE. Seminar, University of California, Berkeley ,USA, May 2001.

  • 36. S. Håland, N. Østgaard, D. Vassiliadis and J. Stadsnes, Principal Component Analysis of X-ray Images, talk at the EGS meeting April 2001, Nice, France.

  • 35. J. Moen, J. A. Holtet, A. Pedersen, B. Lybekk, P. E. Sandholt, K. Oksavik, N Østgaard and G. Gustafsson, CLUSTER observations related to postnoon auroral arcs, talk at the EGS meeting April 2001, Nice, France.

  • 34. J. Stadsnes, J. Bjordal, N. Østgaard, A. Aksnes, R. R. Vondrak, T. J. Rosenberg and D. L. Chenette, Space based imaging of auroral X-rays, talk at the EGS meeting April 2001, Nice, France.

  • 33. N. Østgaard, J. Stadsnes, R. R. Vondrak, and G. Germany, Energy analysis of substorms based on remote sensing techniques, talk at the EGS meeting April 2001, Nice, France.

  • 32. N. Østgaard, G. Germany, J. Stadsnes and R. R. Vondrak, Energy analysis of substorms based on remote sensing techniques and solar wind measurements, poster at the Chapman Conference on Storm-Substorm Relationship, 13-16 March, 2001, Mumbai, India.

    2000

  • 31. A. Aksnes, J. Stadsnes, J. Bjordal, N. Østgaard, D. Detrick, T. J. Rosenberg, R. R. Vondrak and D. Chenette, Global Conductivity Maps Derived From Polar PIXIE Observations, poster at the AGU fall meeting Dec. 2000, San Francisco, USA, EOS Vol. 81, No 48, SM22A-03

  • 30. B. El Marji, B. L. Giles, M. Fok, T. E. Moore, N. Østgaard and M. O. Chandler, Cusp Area, Solar Wind Pressure and Ionospheric Outflow, poster at the AGU fall meeting Dec. 2000, San Francisco, USA, EOS Vol. 81, No 48, SM52A-19

  • 29. S. Håland, N. Østgaard, J. Stadsnes, F. Søraas, G. Germany, R.R. Vondrak, B. Wilken, T. Doke, G. D. Reeves, V. Lutsenko and J. -A Sauvaud, Comparison of Energy Spectra in the Ionosphere and in the Central Plasma Sheet During a Magnetospheric Substorm, talk at the AGU fall meeting Dec. 2000, San Francisco, USA, EOS Vol. 81, No 48, SM21A-10

  • 28. N. Østgaard, J. Stadsnes, R. R. Vondrak, and G. Germany, Energy Analysis of an Isolated Substorm Based on Remote Sensing Techniques, poster at the AGU fall meeting Dec. 2000, San Francisco, USA, EOS Vol. 81, No 48, SM71A-20

  • 27. S. Håland, N. Østgaard, J. Bjordal, J. Stadsnes, S. Ullaland, B. Wilken, T. Yamamoto, T. Doke, D. L. Chenette, G.K. Parks, M. Brittnacher and G. D. Reeves, Energetic Particle Signatures of Reconnection and Plasmoid Formation in the Magnetotail, First S-RAMP Conference, Sapporo, Japan, 2-6 October, 2000.

  • 26. J. Stadsnes, J. Bjordal, N. Østgaard, E. Thorsen, D. L. Chenette, G.K. Parks and M. Brittnacher, Temporal and Spatial Features of the Energetic Electron Precipitation During Substorms, talk at the AGU spring meeting May-June 2000, Washington DC, USA, EOS SM32B-03.

  • 25.N. Østgaard, J. Stadsnes, J. Bjordal, R. R. Vondrak, D. L. Chenette, J. G. Pronko, G. Germany and S. A. Cummer, Global energy input derived from UVI and PIXIE, talk at the AGU spring meeting May-June 2000, Washington DC, USA, EOS SM32B-05.

  • 24. J. Stadsnes, J. Bjordal, N. Østgaard, E. Thorsen, D. L. Chenette, G.K. Parks and M. Brittnacher, Temporal and Spatial Features of the Energetic Electron Precipitation During Substorms, talk at the EGS meeting April 2000, Nice, France.

  • 23. N. Østgaard, J. Stadsnes, J. Bjordal, R. R. Vondrak, D. L. Chenette, J. G. Pronko, G. Germany and S. A. Cummer, Global energy input derived from UV and X rays, talk at the EGS meeting April 2000, Nice, France.

    1999

  • 22. J. Stadsnes, J. Bjordal, N. Østgaard, E. Thorsen and D. L. Chenette, Energetic Electron Precipitation Patterns During Substorm Onset and Expansion, talk at the AGU fall meeting Dec. 1999. Abstract in EOS, Suppl. of Vol. 80, 46, SM52A-10, 1999.

  • 21. S. A. Cummer, R. R. Vondrak, R. Pfaff, N. Østgaard, J. Bjordal, J. Stadsnes, D. L. Chenette, G. K. Parks, M. J. Brittnacher, L. Frank, J. Sigwarth and C. W. Carlson.Global Multispectral Imaging of an Isolated Substorm, talk at the IUGG, Birmingham, July 1999.

  • 20. L.Lazutin, I. Kornilova, G. Starkov, T. Kornilova, L. Borovkov, S. Chernouss, J. Stadsnes, J. Bjordal, N. Østgaard, E. Thorsen, C. Meng, D. G. Sibeck and K. Liou. Comparison of Auroral Dynamics Over Kola Peninsula With the Global Auroral UV and X-ray Oval Measured by Polar/PIXIE, on February 9, 1997. talk at the AGU spring meeting May 1999. Abstract in EOS, Suppl. of Vol. 80, 17, SM31C-10, 1999.

  • 19. S. A. Cummer, R. R. Vondrak, R. Pfaff, N. Østgaard, J. Bjordal, J. Stadsnes, D. L. Chenette, G. K. Parks, M. J. Brittnacher, L. Frank, J. Sigwarth and C. W. Carlson. Global Multispectral Imaging of an Isolated Substorm, talk at the AGU spring meeting May 1999. Abstract in EOS, Suppl. of Vol. 80, 17, SM31C-11, 1999.

  • 18. N. Østgaard, J. Stadsnes, J. Bjordal, R. R. Vondrak, S. A. Cummer, D. L. Chenette, M. Schulz and J. G. Pronko Localized Maximum of X-ray emission in the Morning Sector Caused by Drifting Electrons. Talk at the AGU spring meeting, Boston, May 1999, Abstract in EOS, Suppl. of Vol. 80, 17, SM32D-02, 1999

  • 17.N. Østgaard, "Nordlys - en effekt av stormer og eksplosjoner på solen (The aurora - an effect of solar storms and eruption)", Invited public talk at Bergen Realistforening, 12 Mars, 1999

  • 16. N. Østgaard, "Nordlys - en effekt av stormer og eksplosjoner på solen (The aurora - an effect of solar storms and eruption)", Invited public talk at Norges Fysikkstudenters Konferanse i Bergen, 28 February, 1999

  • 15.N. Østgaard, J. Stadsnes, J. Bjordal, R. R. Vondrak, S. Cummer, D. L. Chenette, M. Schulz, J. G. Pronko, G. K. Parks; M. J. Brittnacher and D. L. McKenzie. Intensified Energetic Electron Precipitation in the Morning Sector Caused by Drifting Electrons. Talk at the 34th Nordic Plasma and Gas Discharge Symposium, Geilo, Norway, 24- 27 January, 1999

    1998

  • 14. J Stadsnes, J Bjordal, E Thorsen, N Østgaard, D L Chenette, G K Parks and M Brittnacher. Temporal Characteristics of Energetic Electron Precipitation during Substorm Onset and Expansion Phase.AGU fall meeting 1998, Abstract in EOS, Suppl. of Vol. 79, 45, SM41B-05, 1998.

  • 13. N. Østgaard, J. Stadsnes, J. Bjordal, R. R. Vondrak, S. Cummer, D. L. Chenette, M. Schulz, J. G. Pronko, G. K. Parks; M. J. Brittnacher and D. L. McKenzie. Intensified Energetic Electron Precipitation in the Morning Sector Caused by Drifting Electrons. Invited talk at the Sixth Huntsville Modelling Workshop at Guntersville, Alabama, 26-30 October 1998

  • 12. N. Østgaard, S. Håland, J. Bjordal, J.Stadsnes, S. Ullaland, G. D. Reeves, D. L. Chenette, B. Wilken, T. Yamamoto, T. Doke, G. K. Parks and M. J. Brittnacher. Magnetospheric and Ionospheric Response to a Substorm: GEOTAIL HEP-LD and POLAR PIXIE Observations, Poster at the AGU spring meeting, Boston, May 1998. Abstract in EOS, Suppl. of Vol. 79, 17, SM41A-08, 1998.

  • 11.S. A. Cummer, R. R. Vondrak, R. Pfaff, N. Østgaard, J. Bjordal, J. Stadsnes, D. L. Chenette, G. K. Parks and M. J. Brittnacher, L. Frank and J. Sigwarth and C.Carlson. Multi-spectral Auroral Imaging on 23 November 1997, talk at the AGU spring meeting May 1998. Abstract in EOS, Suppl. of Vol. 79, 17, SM31B-05, 1998.

  • 10. N. Østgaard, J. Stadsnes, J. Bjordal, R. R. Vondrak, D. L. Chenette, G. K. Parks, M. J. Brittnacher and D. L.McKenzie. Global Scale Electron Precipitation During Substorms, Poster. Abstracts from 32nd Scientific Assembly of COSPAR, Nagoya, Japan 1998.

  • 9. N. Østgaard, Ionospheric Response to Magnetospheric Processes seen in X-ray and UV-images, Talk at the 33th Nordic Plasma and Gas Discharge Symposium, Geilo, Norway, 25- 28 January, 1998.

    1997

  • 8. N. Østgaard, J. Stadsnes, J. Bjordal, E. Thorsen, R. R. Vondrak, D. L. Chenette, G. K. Parks; M. J. Brittnacher and D. L. McKenzie. Global Scale Electron Precipitation Features During Substorms, Poster at the AGU fall meeting Dec. 1997. Abstract in EOS, 78, 46, F601, 1997 - awarded as an Outstanding Student Paper.

  • 7. J. Bjordal, J. Stadsnes, N. Østgaard, E. Thorsen, R. R. Vondrak, D. L. Chenette, J. Mobilia and S. Petrinec, Distribution of High Energy Electron Precipitation During the MSX/FAST Conjuction of 9 February 1997. poster at the AGU fall meeting Dec. 1997. Abstract in EOS, 78, 46, F503, 1997

  • 6. J. Stadsnes, N. Østgaard, F. Søraas, K. Aarsnes, J. Bjordal, K. Måseide, M. Smith and J. Sharber, Coordinated Studies of Auroral X-rays, Optical Emissions and Precipitating Electrons By Rockets. The 24th Annual European Meeting on Atmospheric Studies by Optical Methods, Andenes, Norway, 18-22 August 1997.

  • 5. J. Bjordal, M. Brittnacher, D. L. Chenette, D. L. McKenzie, G. K. Parks, J. Stadsnes, E. Thorsen, and N. Østgaard, X-ray and optical auroral imaging from the Polar satellite. The 24th Annual European Meeting on Atmospheric Studies by Optical Methods, Andenes, Norway, 18-22 August 1997.

  • 4. J. Bjordal, J. Stadsnes, N. Østgaard, D. L. Chenette, W. L. Imhof, G. K. Parks, M. Brittnacher, D. L. McKenzie, T. J.Rosenberg, J. G. Luhmann and R.R.Vondrak, Global Scale Auroral Electron Precipitation Features during Substorms. 8th Scientific Assembly of IAGA with ICMA and STP Symposia, Uppsala, Sweden, 4-15 August 1997.

  • 3. J. Stadsnes, J. Bjordal, E. Thorsen, N. Østgaard, D.L.Chenette, D. L. McKenzie, G. K. Parks and M. Brittnacher, Boundaries and dynamics of the energetic electron precipitation as seen from POLAR images. Invited paper, NATO Advanced Study Institute on Polar Cap Boundary Phenomena, Longyearbyen, Svalbard, 4-13 June 1997.

    1996

  • 2. J. Stadsnes, N. Østgaard, F. Søraas, K.Aarsnes and M. Smith, Electron flux modulations during pulsating aurora, poster at the AGU spring meeting May 1996. Abstract in EOS, 77, S238, 1996.

  • 1. N. Østgaard, J. Stadsnes, K. Aarsnes, F. Søraas and M. Smith. PULSAUR II Launched 01.23 MLT 9.2.1994: X-ray Measurements During a Pulsating Aurora, Talk at the EGS meeting in The Hague, May 1996, Abstract in Annales Geophysicae, Suppl. of Vol. 14, 730, 1996
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