Phase Space Distribution of Relativistic Electrons at Geosynchronous Orbit

Details Phase Space Distribution of Relativistic Electrons at Geosynchronous Orbit Phase Space Distribution of Relativistic Electrons at Geosynchronous Orbit

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm41c0588c&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM41C-0588

Physics

2700 Magnetospheric Physics, 2720 Energetic Particles, Trapped, 2730 Magnetosphere: Inner, 2784 Solar Wind/Magnetosphere Interactions, 7807 Charged Particle Motion And Acceleration

Scientific paper

Understanding the behavior of relativistic electrons in the Earth's radiation belts is of great significance for both practical and theoretical reasons. Although many models have been developed to describe the acceleration, transportation and loss processes, the differentiation of those competing theories eventually calls for a data-assimilation based global electron phase space density model. As an initial step in this development we present the relativistic electron phase space density distribution in the vicinity of geostationary orbit. Combining data from the LANL geosynchronous SOPA and ESP instruments with data from the GOES satellites provides up to 8 simultaneous measurements distributed in longitude. Because of the tilt of the magnetic equator with respect to the geographic equator and drift shell splitting for different pitch angles each satellite samples a different range of L* throughout its orbit. We use a storm-time magnetic field model and the measured pitch-angle resolved electron spectra to determine the phase space density as a function of fixed adiabatic invariants at each spacecraft. Comparing all satellite measurements provides a determination of the global phase space density gradient over the range L*~6-7 as a function of both universal time and local time. We also describe methods for simultaneously solving the field model and particle distributions as a next step toward a global data-assimilation based radiation belt model.

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