Pitch angle evolution of energetic electrons at geosynchronous orbit during disturbed times

Details Pitch angle evolution of energetic electrons at geosynchronous orbit during disturbed times Pitch angle evolution of energetic electrons at geosynchronous orbit during disturbed times

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm41c..08f&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM41C-08

Physics

2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2774 Radiation Belts, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

Pitch angle resolved data have been obtained for three of the Los Alamos geosynchronous energetic particle instruments for parts of the period 2001-2004. The pitch angle distributions show a clear dependence on local time with predominant butterfly distributions at the night side transitioning to pancake at the day side. These are geometric effects due to the Earth's magnetic field asymmetry (shell splitting) which dominate the gross features of the pitch angle distribution and which make it difficult to observe activity dependent changes in the pitch angle distribution such as isotropization due to wave scattering or the effects of in-situ acceleration processes. We attempt here to "remove" the geometric effects in the pitch angle distributions by sorting the data into pitch-angle dependent L* coordinates and the re-assembling the pitch angle distribution adiabatically at a constant, fixed L* of 6.0, using activity-dependent magnetic field models such as Tsyganenko 2004 storm. We will then use this re-assembled dataset to investigate the pitch angle dependence at L*=6.0 on storm phase and local time.

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