Scientific Contributed Presentations by WALTHER N. SPJELDVIK

______________________ 1980 - 1989: ____________________________

Spjeldvik, W. N. and T. A. Fritz: "The Post-Storm Decay of MeV Helium Ions in the Radiation Belts", Spring Annual Meeting of the American Geophysical Union, Toronto, Canada, May 26, 1980. In: EOS, Transactions of the American Geophysical Union, 61, 342, 1980.

Fritz, T. A. and W. N. Spjeldvik: "Effects of the August 1972 Solar Flare Events and Associated Geomagnetic Storm(s) on the Heavy Ion (Z > 4) Population in the Earth's Radiation Belts", Spring Annual Meeting of the American Geophysical Union, Toronto, Canada, May 26, 1980. In: EOS, Transactions of the American Geophysical Union, 61, 343, 1980.

Spjeldvik, W. N.: "Heavy Ions in the Radiation Belts During Magnetic Storms", Department of Physics, Seminar, University of new Hampshire, Durham, New Hampshire, May 30, 1980.

Spjeldvik, W. N. and T. A. Fritz: "Discovery of Ions Heavier than Oxygen at MeV Energies in the Earth's Radiation Belts", Seventh Lindau Symposium: Ion Composition, Max-Planck-Institut fur Aeronomie, Lindau/Katlenburg, Harz, Germany, August 26, 1980.

Spjeldvik, W. N.: "ISEE observasjoner av grenselag mellom plasmaomraader i den ytre magnetosfaeren: magnetopausen og 'plasma-sheet'-randen", ("'ISEE Observations of Boundary Layers between Plasma Regimes in the Outer Magnetosphere: The Magnetospause and the Plasma Sheet Boundary'"), Department of Physics, University of Bergen, Norway, September 17, 1980.

Spjeldvik, W. N.: "The Characteristics of Energetic Ion Streaming Anisotropy on the Northern Edge of the Geomagnetic Plasma Sheet", NASA / ISEE Workshop on the Magnetotail, University of Washington, Seattle, Washington, Lake Quinault Retreat, Washington, March 3, 1981.

Spjeldvik, W. N. and T. A. Fritz: "Relative Variations of Radiation belt Protons, Helium Ions, CNO Ions and Ions with Nuclear Charge Z > 9 During and Following the August 1972 Magnetic Storm", Spring Annual Meeting of the American Geophysical Union, Baltimore, Maryland, May 28, 1981. In: EOS, Transactions of the American Geophysical Union, 62, 365, 1981.

Fritz, T. A. and W. N. Spjeldvik: "The Pitch Angle Distributions of MeV Heavy Ions in the Earth's Radiation Belts: Storm and Quiet", Spring Annual Meeting of the American Geophysical Union, Baltimore, Maryland, May 28, 1981. In: EOS, Transactions of the American Geophysical Union, 62, 365, 1981.

Spjeldvik, W. N. and T. A. Fritz: "Ions Heavier than Oxygen in the Earth's Magnetosphere", International Association of Geomagnetism and Aeronomy, Biannual Meeting, Edinburgh, Scotland, United Kingdom, August, 1981.

Fritz, T. A. and W. N. Spjeldvik: "Steady-State Observations of Geomagnetically Trapped Energetic Ions and Their Implications for Theory", International Association of Geomagnetism and Aeronomy, Biannual Meeting, Edinburgh, Scotland, United Kingdom, August, 1981.

Spjeldvik, W. N.: "Energetic Particle Motion in the Interior of the Plasma Sheet During a Geomagnetic Disturbance", International Association of Geomagnetism and Aeronomy, Biannual Meeting, Edinburgh, Scotland, United Kingdom, August, 1981.

Spjeldvik, W. N. and T. A. Fritz: "Waves of Periods 2-5 Minutes Observed in > 24 KeV Ions on the Boundary of the Plasma Sheet", International Association of Geomagnetism and Aeronomy, Biannual Meeting, Edinburgh, Scotland, United Kingdom, August, 1981.

Spjeldvik, W. N.: "Charge Transfer Processes for Energetic Ions in the Magnetosphere", Department of Physics, University of Denver, Denver, Colorado, October 6, 1982.
Spjeldvik, W. N. and H. A. Garcia: "Local Time Variations of Ring Current and of the Radiation Belt Ion Fluxes and Anisotropies", Fall Annual Meeting of the American Geophysical Union, San Francisco, California, December 8, 1982. In: EOS, Transactions of the American Geophysical Union, 63, 1079, 1982.

Garcia, H. A. and W. N. Spjeldvik: "The Energy Dependence of Ion Pitch Angle Anisotropy in the Magnetosphere and the Determination of Plasma Density from Energy versus Anisotropy Minima", Fall Annual Meeting of the American Geophysical Union, San Francisco, California, December 8, 1982. In: EOS, Transactions of the American Geophysical Union, 63, 1078, 1982.

Spjeldvik, W. N.: "Theoretical Modeling of the Earth's Radiation Belts", Department of Physics, University of Colorado at Denver, Denver, Colorado, March 10, 1983.

Spjeldvik, W. N. and H. A. Garcia: "Geomagnetically Trapped Ions: Anisotropy Dependence on Local Time", Spring Annual Meeting of the American Geophysical Union, Baltimore, Maryland, May 31, 1983. In: EOS, Transactions of the American Geophysical Union, 64, 287, 1983.

Garcia, H. A. and W. N. Spjeldvik: "The Systematic Variations of Ion Pitch Angle Anisotropy with Energy and L", Spring Annual Meeting of the American Geophysical Union, Baltimore, Maryland, June 2, 1983. In: EOS, Transactions of the American Geophysical Union, 64, 297, 1983.

Spjeldvik, W. N.: "On the Pitch Angle Anisotropy of Trapped Particles", Air Force Geophysics Laboratory, Space Physics Seminar, Hanscom AFB, Bedford, Massachusetts, July 20, 1983.

Spjeldvik, W. N.: "Plasma, Energetic Particle and Low Energy Solar Cosmic Ray Detectors on the NOAA / TIROS and GOES Spacecraft: Capabilities and Scientific Usage", NASA / ISTP Science Workshop, NASA Goddard Space Flight Center, Greenbelt, Maryland, October 11, 1983.

Sauer, H. H. and W. N. Spjeldvik: "VLF Response to Solar Cosmic Ray Events: Delayed Phase Recovery", Fall Annual Meeting of the American Geophysical Union, San Francisco, California, December 7, 1983. In: EOS, Transactions of the American Geophysical Union, 64, 804, 1983.

Spjeldvik, W. N. and H. A. Garcia: "ISEE-1 Observations of Geomagnetically Trapped Ion Anisotropies", Fall Annual Meeting of the American Geophysical Union, San Francisco, California, December 8, 1983. In: EOS, Transactions of the American Geophysical Union, 64, 806, 1983.

Spjeldvik, W. N.: "Space Physics and Aurorae", Department of Physics, Boston College, Chestnut Hill, Massachusetts, April 11, 1984.

Spjeldvik, W. N.: "Techniques for Numerical Modeling of Physical Processes in the Earth's Radiation Belts: 1. Finite Difference Formulation for Parabolic Partial Differential Equations", Department of Physics, Boston College, Chestnut Hill, Massachusetts, September 18, 1984.

Spjeldvik, W. N.: "Understanding the Earth's Radiation Belts: Where We are and What We are Doing", Colloquium, Department of Physics, Boston College, Chestnut Hill, Massachusetts, September 19, 1984.

Spjeldvik, W. N.: "Techniques for Numerical Modeling of Physical Processes in the Earth's Radiation Belts: 2. Finite Element Technique Formulation for Elliptic Partial Differential Equations", Department of Physics, Boston College, Chestnut Hill, Massachusetts, September 30, 1984.

Spjeldvik, W. N.: "Data Search, Interpolation, Curve Fitting, Solution of Transcendental Equations and Solution of Linear System of Algebraic Equations by Numerical Techniques", Space Physics Division, Air Force Geophysics Laboratory, Hanscom AFB, Massachusetts, October 15, 1984.

Spjeldvik, W. N.: "Numerical Representation of Differential Operators and Estimation of Error: A Prelude to Solving Differential Equations", Space Physics Division, Air Force Geophysics Laboratory, Hanscom AFB, Massachusetts, October 16, 1984.

Spjeldvik, W. N.: "Techniques for Numerical Integration of Integral Expressions and Linear Integral Equations of the Volterra and Fredholm Types", Space Physics Division, Air Force Geophysics Laboratory, Hanscom AFB, Massachusetts, October 17, 1984.

Spjeldvik, W. N.: "Solution of First Order Linear Partial Differential Equations: Application to Time Dependent Convection Problems, Stable and Unstable Finite Difference Techniques", Space Physics Division, Air Force Geophysics Laboratory, Hanscom AFB, Massachusetts, October 18, 1984.

Spjeldvik, W. N.: "Numerical Solution of Second Order Linear Partial Differential Equations: Application to Steady State and Time Dependent Inhomogeneous Diffusion Problems", Space Physics Division, Air Force Geophysics Laboratory, Hanscom AFB, Massachusetts, October 19, 1984.

Spjeldvik, W. N.: "Radiation Belt Physics: Theory and Experiment", Physical Sciences Seminar, Eastern New Mexico University, Portales, New Mexico, November 26, 1984.

Spjeldvik, W. N., S. M. Gussenhoven, R. C. Filz, F. A. Hanser and G. Farrell: "Observations of Heavy Ion to Proton Flux Ratios at MeV Energies: Comparison of Many Experiments", Fall Annual Meeting of the American Geophysical Union, San Francisco, California, December 6, 1984. In: EOS, Transactions of the American Geophysical Union, 65, 1055, 1984.

Spjeldvik, W. N.: "Physical Modeling of the Steady State Radiation Belts of the Earth: Numerical Simulation Techniques and Results Obtained", Second International School of Space Plasma Simulations, Kapaa, Kauai, Hawaii, February 6, 1985.

Spjeldvik, W. N.: "Development of Dynamical Models for Radiation Belt Perturbations using Numerical Simulation Techniques", Second International School of Space Plasma Simulations, Kapaa, Kauai, Hawaii, February 6, 1985.

Spjeldvik, W. N.: "Computer Simulation, Theory and Experiment in Physics of the Earth's Radiation Zone", Physics Colloquium, Physics Department, Weber State University, Ogden, Utah, April 21, 1985.

Spjeldvik, W. N.: "Physics of Energetic Confined Particles in the Earth's Radiation Belts", Physics Seminar, Department of Physics, University of Houston, Houston, Texas, April 23, 1985.

Spjeldvik, W. N.: "Radiation Belt Physics: Trapping of Relativistic Electrons and Energetic Heavy Ions", Physics Seminar, Department of Physics, California State University, San Jose, California, May 12, 1985.

Spjeldvik, W. N.: "Time Dependent Model Development for Diffusive Processes in the Earth's Radiation Belts", Space Environment Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, July 15, 1985.

Spjeldvik, W. N. and H. H. Sauer: "Consequences of Solar Energetic Particle Emissions on Geomagnetically Trapped Particles", Fall Annual Meeting of the American Geophysical Union, San Francisco, California, December 9, 1985. In: EOS, Transactions of the American Geophysical Union, 66, 1043, 1985.

Spjeldvik, W. N.: "Advances in Modeling of the Earth's Radiation Belt Region", National Oceanic and Atmospheric Administration, Environmental Research Laboratories, SEL Seminar, Boulder, Colorado, March 28, 1986.

Spjeldvik, W. N.: "Physical Radiation Belt Models: What can they do?", Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, August 8, 1986.

Spjeldvik, W. N.: "Techniques for Simulating the Steady State Proton Fluxes in the Earth's Radiation Belts based on First Principles", Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, August 15, 1986.

Spjeldvik, W. N.: "Comparing Model Calculations of Trapped Protons with the Observed Reality", Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, September 7, 1986.

Spjeldvik, W. N.: "Development of Event-Oriented, Time-Dependent Simulation Techniques for Energetic Proton Fluxes in the Earth's Radiation Belts", Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, September 14, 1986.

Spjeldvik, W. N.: "Consequences of the Duration of Solar Energetic Particle Associated Geomagnetic Storms on the Intensity of Geomagnetically Trapped Radiation", First Huntsville Symposium on Space Physics Modeling, Lake Guntersville Lodge, Alabama, October 18, 1986.

Spjeldvik, W. N., R. Martin, E. Gillis and T. Speiser: "Review of the Huntsville Symposium on Magnetosphere-Ionosphere Models", Space Environment Laboratory, National Oceanic and Atmospheric Administration, Plasma Physics Seminar, Boulder, Colorado, October 23, 1986.

Spjeldvik, W. N.: "How to Make an Unstable Coupled System of Differential Equations Numerically Stable: Application to Charge Exchange of Sub-Relativistic Confined Ion Distributions", Space Environment Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, October 25, 1986.

Spjeldvik, W. N.: "Solution of the Parabolic Partial Differential Equations for the Earth's Trapped Radiation by Finite Difference Techniques", Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, November 10, 1986.

Spjeldvik, W. N.: "Comparing the Different Ion Species in the Quiet Time Radiation Belt Region", Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, November 17, 1986.

Spjeldvik, W. N.: "The Prospect for Solving the Elliptic Partial Differential Equations for the Coupled Radial and Pitch Angle Diffusion of Geomagnetically Confined Charged Particles", Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, November 24, 1986.

Spjeldvik, W. N. and H. H. Sauer: "Re-examination of the Charge State Coupled Transport Equations for Magnetically Trapped Heavy Ions: Application to the Earth's Trapping Region", Fall Annual Meeting of the American Geophysical Union, San Francisco, California, December 9, 1986. In: EOS, Transactions of the American Geophysical Union, 67, 1162, 1986.

Spjeldvik, W. N.: "Observations of Radiation Belt Electrons and Ions: What We need to Explain and Model", Space Plasma Physics Seminar, Los Alamos National Laboratory, New Mexico, January 5, 1987.

Spjeldvik, W. N.: "Theory for Radiation Belt Particles: Stochastic Analysis", Space Plasma Physics Seminar, Los Alamos National Laboratory, New Mexico, January 6, 1987.

Spjeldvik, W. N.: "Modeling of the Quiet Time Radiation Zone of the Earth", Space Plasma Physics Seminar, Los Alamos National Laboratory, New Mexico, January 7, 1987.

Spjeldvik, W. N.: "Measuring the Speed of Light with a Pulsed Laser at 1 MHz", Spring Meeting of the American Association of Physics Teachers, Weber State College, Ogden, Utah, March 6, 1987.

Spjeldvik, W. N.: "Magnetic Torque Technique in Attitude Control of the NuSat-II Spacecraft: Mechanical Aspects", Tutorial Lecture, Department of Physics, Weber State University, Ogden, Utah, October 14, 1987.

Spjeldvik, W. N.: "Computing the Mean Surface Temperature of the Planet Earth Based on Astrophysical Quantities and a simple Two-layer Model of Infrared Radiative Transfer in the Earth's Atmosphere", Physics Department Seminar, Weber State University, Ogden, Utah, November 12, 1987.

Spjeldvik, W. N.: "Magnetic Torque Technique in Attitude Control of the NuSat-II Spacecraft: Electro-Kinematical Aspects", Tutorial Lecture, Department of Physics, Weber State University, Ogden, Utah, November 30, 1987.

Spjeldvik, W. N. and H. H. Sauer: "Comparison of Predictions from a Diffusive Entry Proton Radiation Belt Disturbance Model with Magnetospheric in-situ Data", Fall Annual Meeting of the American Geophysical Union, San Francisco, California, December 8, 1987. In: EOS, Transactions of the American Geophysical Union, 68, 1432, 1987.

Spjeldvik, W. N.: "Origin of Magnetism and Motion of Charged Particles in Inhomogeneous Magnetic Fields: Stoermer Theory and Adiabatic Invariant Fundamentals", Physics Seminar Series, Department of Physics, Weber State University, Ogden, Utah, February 11, 1988.

Spjeldvik, W. N.: "Charge State Distribution algorithms for the Steady State Radiation Belts of the Earth", Fall Annual Meeting of the American Geophysical Union, San Francisco, California, December 5, 1988. In: EOS, Transactions of the American Geophysical Union, 69, 1375, 1988.

Spjeldvik, W. N.: "Study of Iron Ions in the Earth's Outer Radiation Belt", AMPTE / CCE Working Group presentation, Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland, September 19, 1989.

Spjeldvik, W. N.: "Iron Ions in Earthspace", Physics Department Seminar, Weber State University, Ogden, Utah, October 17, 1989.

Spjeldvik, W. N. and R. W. McEntire: "A Theoretical Model of Iron Ions in the Earth's Radiation Belts", Fall Annual Meeting of the American Geophysical Union, San Francisco, California, December 5, 1989. In: EOS, Transactions of the American Geophysical Union,70, 1276, 1989

McEntire, R. W. and W. N. Spjeldvik: "Spectra and Radial Distributions of Iron Ions in the Earth's Radiation Belts: AMPTE / CCE Observations and Comparison with Diffusion Theory", Fall Annual Meeting of the American Geophysical Union, San Francisco, California, December 5, 1989. In: EOS, Transactions of the American Geophysical Union, 70, 1276, 1989.

Robinson, P. A. and W. N. Spjeldvik: "A Parameter Study of Latitude Variations of Particle Pressures and Electrical Current Distributions in the Earth's Ring Current", Fall Annual Meeting of the American Geophysical Union, San Francisco, California, December 4, 1989. In: EOS, Transactions of the American Geophysical Union, 70, 1265, 1989.