Scientific Contributed Presentations by WALTHER N. SPJELDVIK

________________________ 1990 - 1999: ___________________________

Spjeldvik, W. N.: "Diffusion Processes in Geospace: When Energetic Particle Transport Defaults to Diffusion in Phase Space", Department of Physics, Weber State University, Utah, May 1990.

Spjeldvik, W. N.: "Very Heavy Ions Trapped in the Earth's Radiation Belt Region: Theory and Comparison with Results from the AMPTE/CCE Spacecraft Detectors", Los Alamos National Laboratory, Los Alamos, New Mexico, March 28, 1991.

Spjeldvik, W. N.: "Numerical Simulation Methods in Energetic Particle Transport Theory: 1. Finite Difference Techniques for Steady State", Physics Institute, University of Bergen, Norway, October 19, 1991.

Spjeldvik, W. N.: "Numerical Simulation Methods in Energetic Particle Transport Theory: 2. Local Integration Method for Time Independence", Physics Institute, University of Bergen, Norway, October 26, 1991.

Spjeldvik, W. N.: "Numerical Simulation Methods in Energetic Particle Transport Theory: 3. Finite Element Approach and the Time Dependent Cases", Physics Institute, University of Bergen, Norway, November 3, 1991.

Spjeldvik, W. N.: "A Model of Simultaneous Radial Diffusion, Pitch Angle Scattering and Energy Degradation in the Earth's Radiation Belts", Solar-Terrestrial Energy Program STEP-Symposium, Committee on Space Research (COSPAR) World Space Congress, Johns Hopkins University - Applied Physics Laboratory (APL), Laurel, Maryland; August 27, 1992.

Spjeldvik, W. N.: "Response of Radiation Belt Particle Flux to Enhanced Solar Particle Emissions: Model Calculations", Solar-Terrestrial Energy Program STEP-Symposium, Committee on Space Research (COSPAR) World Space Congress, Johns Hopkins University - Applied Physics Laboratory (APL), Laurel, Maryland; August 27, 1992.

Spjeldvik, W. N.: "Space Radiation in Earth-Space: Status of Knowledge and Efforts", Space Environmental Effects Symposium, Space Technology Interdependency Group: U.S. Air Force and the National Aeronautics and Space Administration (NASA), Washington Court Hotel, Washington, D.C., November 17, 1992.

Spjeldvik, W. N.: "Magnetospheric Physics Spacecraft Missions: Old Data Archiving and Restoration", NASA Headquarters, Office of Spce Science and Applications, Space Physics Division, Governor's House, Washington, DC, May 5, 1993.

Spjeldvik, W. N.: "The NASA Supporting Research and Technology Program", Meeting of the NASA Headquarters Management Operations Working Group, Governor's House, Washington, D.C., May 6, 1993.

Spjeldvik, W. N.: "International Collaboration in Trapped Particle Modeling: An Effort under the IACG Aegis", Meeting of the NASA Headquarters Management Operations Working Group, Governor's House, Washington, D.C., May 6, 1993.

Spjeldvik, W. N.: "The NASA Magnetospheric Modeling Initiative", Meeting of the NASA Headquarters Management Operations Working Group, Governor's House, Washington, D.C., May 7, 1993.

Spjeldvik, W. N.: "NASA Delegation Presentation: Avenues of Russia-USA Cooperation in Space Physics", Meeting of the USA-Russia Bilateral Working Group in Space Physics, Izmiran Resort, Moscow Region, Russia, May 1993.

Spjeldvik, W. N.: "The NASA Space Physics Research Plan and Initiatives: 1993-2005", Nuclear Physics Institute, Moscow State University, Moscow, Russia, May 1993.

Spjeldvik, W. N.: "Numerical Techniques for Modeling Time Dependent Transport of Geomagnetically Trapped Charged Particles", Nuclear Physics Institute, Moscow State University, Moscow, Russia, May 1993.

Spjeldvik, W. N.: "Numerical Modeling of Stably and Transiently Trapped Energetic Charged Particles in the Earth's Magnetosphere",,, Workshop and Symposium on Radiation Belt Models, Dubna, Russia, June 1993.

Spjeldvik, W. N.: "The IACG Initiative in Physical and Numerical Modeling of the Earth's Radiation Belts", Space Environment and Effects committee Joint meeting with the Third Long Duration Exposure Facility Symposium, Williamsburg, Virginia; November 12, 1993.

Spjeldvik, W. N.: "USA - Argentina Collaboration in Space Research: Three New Proposed Space Experiments Suitable for an Argentine Spacecraft with a US Pegasus Launcher", Joint NASA - CONAE Agency Spacecraft Planning Symposium, Buenos Aires, Argentina, November 30, 1994.

Spjeldvik, W. N.: "Energetic Charged Particle Transport by Diffusive processes in Earthspace", Department of Mathematics, Weber State University, Ogden, Utah; January 18, 1995.

Spjeldvik, W. N.: "Predicted Charge State Distributions of Carbon and Iron Ions in the Earth's Radiation Belt Region", Space Radiation Laboratory, California Institute of Technology, June 23, 1995.

Spjeldvik, W. N.: "Energetic Particles of Extraterrestrial Source: Carbon and Iron Ions Confined Within the Earth's Radiation Belt Region", International Union of Geodesy and Geophysics XXI General Assembly, Boulder, Colorado, June 7, 1995.

Gusev, A. A., T. Kohno, I. M. Martin, G. I. Pugacheva and W. N. Spjeldvik: "The Temporal Evolution of 3-9 MeV/nucleon He Flux Trapped in the Magnetosphere", International Cosmic Ray Conference, Rome, Italy, 1995.

Tylka, A. J. and W. N. Spjeldvik: "Theoretical Modeling of Trapped Anomalous Cosmic Rays Using Energy Dependent Atomic Stripping Cross-Sections", American Geophysical Union, Spring Annual Meeting, Baltimore, Maryland, May 1996.

Spjeldvik, W. N.: "The Effective Magnetospheric Penetration Depth for Energetic Heavy Ions from an Extraterrestrial Source", The XVIII Assembly of COSPAR, Birmingham, England, July 1996.

Spjeldvik, W. N.: "Polar Spacecraft Observations of Helium Ions in the Earth's Inner Magnetosphere", Center for Space Physics, Boston University, Boston, Massachusetts, 13 September, 1996.

Spjeldvik, W. N., G. I. Pugacheva, A. A. Gusev and I. M. Martin: "Local Generation of Isotopes of Energetic Helium Ions in the Inner Radiation Zone of the Earth", Symposium on Environment Modeling for Space-Based Applications, European Space Agency, ESTEC, Noordwijk, The Netherlands, 18 September 1996.

Spjeldvik, W. N., T. A. Fritz and J. Chen: "Observations of Radiation Belt Helium Ions with the CAMMICE/HIT detector on the POLAR Spacecraft", 1996 Fall Annual Meeting of the American Geophysical Union, EOS, Transactions of the American Geophysical Union, 77 (#46), F632, 1996.

Chen, J., T. A. Fritz, R. L. Sheldon and W. N. Spjeldvik: "Solar Energetic Particle Event on 8/27/96 Observed by the POLAR Spacecraft", 1996 Fall Annual Meeting of the American Geophysical Union, EOS, Transactions of the American Geophysical Union, 77 (#46), F602, 1996.

Matthews, D. L., R. B. Sheldon, H. E. Spence and W. N. Spjeldvik: "Data-driven Dynamic Diffusion Determination and Consequences for Theory", 1996 Fall Annual Meeting of the American Geophysical Union, EOS, Transactions of the American Geophysical Union, 77 (#46), F633, 1996.

Spjeldvik, W. N., T. A. Fritz, R. B. Sheldon and J. Chen: "Azimuthal and Radial Distributions of Radiation Belt Helium Ions: POLAR Spacecraft Observations in 1996", American Geophysical Union, Spring Annual Meeting, Baltimore, Maryland, May 1997.

Chen, J., T. A. Fritz, R. B. Sheldon, H. E. Spence, W. N. Spjeldvik, J. F. Fennell, and S. Livi: "Cusp Energetic Particle Events Discovered by the POLAR Spacecraft", Spring Annual Meeting, Baltimore, Maryland, May 1997.

Spjeldvik, W. N., T. A. Fritz, R. B. Sheldon and J. Chen: "Magnetic Local Time Survey of Radiation Belt Helium Ion Structure Conducted with Data from the POLAR CAMMICE/HIT Instrument", Symposium on Scientific Results from the ISTP/GGS Mission, Island of Paros, Greece, June, 1997.

Fritz, T. A., J. Chen, R. B. Sheldon, H. E. Spence, W. N. Spjeldvik, J. F. Fennell and S. Livi: "Cusp Energetic Particle Events measured by POLAR Spacecraft", Symposium on Scientific Results from the ISTP/GGS Mission, Island of Paros, Greece, June, 1997.

Pugacheva, G. I., W. N. Spjeldvik, A. A. Gusev, I. M. Martin: "The Influence of Synchrotron Energy Losses on the Inner Radiation Zone Electron Deceleration Process", International Cosmic Ray Conference, Durban, South Africa, July-August, 1997.

Gusev, A. A., T. Kohno, W. N. Spjeldvik, I. M. Martin, G. I. Pugacheva and A. Turtelli, Jr.: "The 1 - 9 MeV/nucleon He Flux Dynamics in the Inner Magnetosphere During 1984-1986", International Cosmic Ray Conference, Durban, South Africa, July-August, 1997.

Pugacheva, G. I., A. A. Gusev, I. M. Martin, D. M. Boscher, S. A. Bourdarie and W. N. Spjeldvik: "A Three-Dimensional Model of the Electron Radiation belt at High Energies", International Cosmic Ray Conference, Durban, South Africa, July-August, 1997.

Spjeldvik, W. N., G. I. Pugacheva, A. A. Gusev and I. M. Martin: "Production of Light Element Isotopes in the Inner Magnetosphere", International Cosmic Ray Conference, Durban, South Africa, July-August, 1997.

Spjeldvik, W. N., T. A. Fritz, R. B. Sheldon and J. Chen: "New POLAR Spacecraft Observations of Radiation Belt Ions", International Association of Aeronomy and Geomagnetism, Uppsala Symposium, Sweden, August 14, 1997.

Spjeldvik, W. N., T. Kohno, A. A. Gusev, I. M. Martin and G. I. Pugacheva: "Magnetospheric He Ion Flux Dynamics at 1.2-9.2 MeV/nucleon Observed with the OHZORA Spacecraft During 1984-1986", International Association of Aeronomy and Geomagnetism, Uppsala Symposium, Sweden, August 14, 1997.

Spjeldvik, W. N., G. I. Pugacheva, A. A. Gusev and I. M. Martin: "Local Generation of Light Element Isotopes and Their Resulting Distributions in the Earth's Inner Magnetosphere", International Association of Aeronomy and Geomagnetism, Uppsala Symposium, Sweden, August 14, 1997.

Spjeldvik, W. N., G. I. Pugacheva, A. A. Gusev and I. M. Martin: On Synchrotron Energy Losses of High Energy Confined Magnetospheric Electrons: Characteristic Time Scales", International Association of Aeronomy and Geomagnetism, Uppsala Symposium, Sweden, August 14, 1997.

Spjeldvik, W. N., S. Bourdarie, D. Boscher, A. A. Gusev, I. M. Martin and G. I. Pugacheva: "Three-Dimensional Model of the Earth's Inner Electron Radiation Belt Including Synchrotronic-, Coulomb- and Wave-Scattering Losses", International Association of Aeronomy and Geomagnetism, Uppsala Symposium, Sweden, August 14, 1997.

Chen, J., T. A. Fritz, R. B. Sheldon, H. E. Spence, W. N. Spjeldvik, J. F. Fennell, S. Livi: "Polar Cusp Energetic Particle Events measured by the POLAR Spacecraft", International Association of Aeronomy and Geomagnetism, Uppsala Symposium, Sweden, August 14, 1997.

Sheldon, R. B., J. Chen, T. A. Fritz, H. Spence, J. Sullivan, W. N. Spjeldvik: "The Bimodal Response of the Earth's Magnetosphere to Coronal Mass Ejection (CME) Events: A New Magnetic Storm Classification", International Association of Aeronomy and Geomagnetism, Uppsala Symposium, Sweden, August 14, 1997.

Pugacheva, G. I., D. M. Boscher, A. A. Gusev, I. M. Martin, and W. N. Spjeldvik: "Magnetospheric Electron Radial Transport with Accounting for Synchrotron Radiation Losses", 5-o Congresso Internacional da Sociedade Brasileira de Geofisica, Centro de Convencoes do Hotel Transamerica, Sao Paulo, Brazil, 28 September through 2 October, 1997.

Pugacheva, G. I., A. A., Gusev, I. M. Martin, and W. N. Spjeldvik: "Modeling of Isotope Radiation Belts in the Inner Magnetosphere", 5-o Congresso Internacional da Sociedade Brasileira de Geofisica, Centro de Convencoes do Hotel Transamerica, Sao Paulo, Brazil, 28 September through 2 October, 1997.

Spjeldvik, W. N., T. A. Fritz, R. B. Sheldon and J. Chen: "New Insight on Radiation Belt Helium Ions: Quiet Time ISTP/POLAR Spacecraft Observations of Radial Profiles, Local Time Variations and Anisotropy Characteristics", International Symposium on the Earth's Radiation Belts, Moscow State University, Moscow, Russia, October 7-9, 1997.

Spjeldvik, W. N., T. A. Fritz, R. B. Sheldon and J. Chen: "Distribution of Radiation belt Helium Ions in Azimuth Around the Earth: Observations with the CAMMICE/HIT Instrument on ISTP/POLAR", International Symposium on the Earth's Radiation Belts, Moscow State University, Moscow, Russia, October 7-9, 1997.

Pugacheva, G. I., W. N. Spjeldvik., A. A. Gusev, I. M. Martin, and N. M. Sobolevsky: "Nuclear Processes as Sources of Energetic Charged Particles in the Inner Radiation Zone of the Earth: Source Functions", International Symposium on the Earth's Radiation Belts, Moscow State University, Moscow, Russia, October 7-9, 1997.

Spjeldvik, W. N.: "Modeling the After-Effects of a Heliospheric Traveling Shock Wave Through the Earth's Radiation Belts", 1998 COSPAR Biannual Symposium,, 32nd Assembly Book, p. 235, Nagoya, Japan, July 1998.

Pugacheva, G. I., A. A. Gusev, T. Kohno, I. M. Martin, and W. N. Spjeldvik: "An Investigation of the Spatial and Time Variations of Energetic Trapped Helium Ions with the Japanese Ohzora and Akebono Satellites", 1998 COSPAR Biannual Symposium, 32nd Assembly Book, p. 228, Nagoya, Japan, July 1998.

Spjeldvik, W. N.: "Transient Effects of Solar Energetic Particle Flux Enhancements on the Inner Magnetosphere of the Earth", 1998 COSPAR Biannual Symposium, 32nd Assembly Book, p. 229, Nagoya, Japan, July 1998.

Pugacheva, G. I., D. M. Boscher, A. A. Gusev, I. M. Martin, and W. N. Spjeldvik: "Transport Modeling of Energetic Electrons in the Inner Magnetosphere with Accounting for Synchrotron Energy Losses", 1998 COSPAR Biannual Symposium, 32nd Assembly Book, p. 228, Nagoya, Japan, July 1998.

Gusev, A. A., T. Kohno, I. M. Martin, G. Pugacheva and W. N. Spjeldvik: "The Spatial Distribution and Dynamics of MeV Proton Fluxes under the Earth's Radiation Belt", 1998 COSPAR Biannual Symposium, 32nd Assembly Book, p. 229, Nagoya, Japan, July 1998.

Pugacheva, G. I., A. A., Gusev, I. M. Martin, and W. N. Spjeldvik: "Modeling of Isotope Radiation Belts in the Inner Magnetosphere", 5-o Congresso Internacional da Sociedade Brasileira de Geofisica, Centro de Convencoes do Hotel Transamerica, Sao Paulo, Brazil, 28 September through 2 October, 1997.

Martin, I. M., A. A. Gusev, T. Kohno, G. I. Pugacheva, and W. N. Spjeldvik: "Space Distribution of Energetic He Ion Flux in the Magnetosphere: Ohzora Observations During 1984-1986", Brasileira Collage, Sao Jose Dos Campos, Brazil, August 1998.

Gusev, A. A., I. M. Martin, G. I. Pugacheva, A. Turtelli, T. Kohno, and W. N. Spjeldvik: "The Secondary Proton Radiation Belt: Origin and Dynamics", Brasileira Collage, Sao Jose Dos Campos, Brazil, August 1998.

Gusev, A. A., I. M. Martin, G. I. Pugacheva, A. Turtelli, T. Kohno, and W. N. Spjeldvik: "On the Secondary Proton Radiation Belt:", Brasileira Collage, Sao Jose Dos Campos, Brazil, August 1998.

Gusev, A. A., G. I. Pugacheva, I. M. Martin, and W. N. Spjeldvik: "Energetic Trapped Helium Ions Observed by the OHZORA and AKEBONO Satellites", Seminario de Posters da Quita Colage -- San Jose em Sao Jose Dos Campos, Instituto Nacional de Pesquisas Espaciais, Brazil, 9 through 13 November, 1998.

Pugacheva, G. I., D. M. Boscher, A. A. Gusev, I. M. Martin, and W. N. Spjeldvik: "Electron Radial Transport with Accounting for Synchrotron Radiation Losses", Brasileira Collage, Sao Jose Dos Campos, Brazil, August 1998.

Pugacheva, G. I., A. A. Gusev, I. Martin, and W. Spjeldvik: "Antiparticles and Light Element Isotope Ions in the Planetary Magnetospheres", Latin American Conference on Space Physics, San Jose, Costa Rica, November 1998.

Gusev, A. A., T. Kohno, I. Martin, G. I. Pugacheva, and W. N. Spjeldvik: "Dynamics of the Energetic Trapped Helium Ions Observed Onboard the Ohzora and Akebono Satellites", Latin American Conference on Space Physics, San Jose, Costa Rica, November 1998.

Pugacheva, G. I., D. Boscher, A. A. Gusev, I. Martin, and W. N. Spjeldvik: "The Role of Synchrotron Energy Losses in Formation of the Energetic Electron Population in the Magnetosphere" Latin American Conference on Space Physics, San Jose, Costa Rica, November 1998.

Spjeldvik, W. N.: "Relativistic Electrons and Energetic Ions in the Inner Magnetosphere of The Earth: A Modeling Approach", Gleb Wataghin Institute of Physics, Universidade Estadual de Campinas, Sao Paulo, Brazil, May 29, 1999.

Gusev, A. A., I. M. Martin, G. I. Pugacheva, A. C. Catlin, and W. N. Spjeldvik: "Results of a FEM Simulation of the Geomagnetic Proton Radiation Belt", International Cosmic Ray Conference, Salt Lake City, USA, August, 1999.

Pugacheva, G. I., A. A. Gusev, T. Kohno, M. Martin, and W. N. Spjeldvik: "On the Local Time Dependence of the Magnetospheric Energetic Helium Ion Spatial Distribution", International Cosmic Ray Conference, Salt Lake City, USA, August,1999.

Spjeldvik, W. N.: "Unconditionally Stable Algorithms for 3-dim Proton Transport", ONERA-CERT/DESP Research Facility, Toulouse, France, August, 1999.

Spjeldvik, W. N.: "Charge State Coupling Amongst the Helium Ion Species in Radiation Belt Transport Theory: A 4-dimensional Numerical Approach", ONERA-CERT/DESP Research Facility, Toulouse, France, September, 1999.

Spjeldvik, W. N.: "Oxygen and Iron Ion Transport Simulations with Multiple Ionic Charge States: 4-dim Numerical Modeling Techniques including the Discrete Charge State Space", ONERA-CERT/DESP Research Facility, Toulouse, France, November 1999.