Low Altitude Distribution of Radiation Belt Electrons

Details Low Altitude Distribution of Radiation Belt Electrons Low Altitude Distribution of Radiation Belt Electrons

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm41c0585s&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM41C-0585

Statistics

Computation

2716 Energetic Particles, Precipitating, 2720 Energetic Particles, Trapped, 2730 Magnetosphere: Inner, 2753 Numerical Modeling

Scientific paper

In radiation belt mapping it is usual to assume that particle data are independent of the phase angles associated with gyration, bounce, and drift motions. Similarly, trapped particle modeling often addresses the bounce and drift averaged distribution of the guiding centers. These are useful approximations for the high altitude radiation belt, where most of the observed particles have mirror points that are well above the dense atmosphere. The reverse is true at low altitudes (below ˜1000~km) where it becomes necessary to account for the role of the atmosphere in creating strong bounce and drift phase dependences of the trapped particle guiding center distributions. Such a computational model of the low altitude electron distribution is described. It applies to geomagnetically quiet periods of decaying electron intensity and to locations inside the plasmasphere where plasma waves are the dominant scattering mechanism that cause diffusion into the atmospheric loss cones. The model parameters are adjusted to fit samples of electron data taken by a low altitude satellite, thereby providing empirical constraints on theories of radiation belt electron losses.

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