Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm53b1279g&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM53B-1279
Physics
2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2774 Radiation Belts, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
The evolution of high energy electron pitch angle distributions (PADs) can provide clues to help us distinguish the physical processes at work in the Earth's radiation belts. The shape of a PAD is affected by the geometric structure of the magnetic field environment and by the particle distributions. Changes in the form of magnetic field reconfiguration or the particle populations can result in specific changes in PAD. Using GOES-11 particle and magnetic field data, while the satellite was spinning in storage mode in geosynchronous orbit, we obtain pitch angle resolved electron measurements (>600 keV and >2MeV) and observe the evolution of the constructed PADs. In this study, we observe an unusual event occurring March 22 - 28, 2002, which suggests an acceleration mechanism which favors field-aligned electrons, resulting in clearly observed butterfly-type (minimum around 90 degrees) distributions at all local times over a 2 day period.
Gannon J. L.
Onsager T.
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