GOES-11 Pitch Angle Distribution Analysis of Energetic Magnetospheric Electron Source and Loss Processes

Details GOES-11 Pitch Angle Distribution Analysis of Energetic Magnetospheric Electron Source and Loss Processes GOES-11 Pitch Angle Distribution Analysis of Energetic Magnetospheric Electron Source and Loss Processes

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm43b1501g&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM43B-1501

Physics

2700 Magnetospheric Physics (6939), 2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Pitch angle distributions and their evolution can give us information about the physical processes affecting energetic magnetospheric electrons beyond phase space density or flux analyses alone. The GOES-11 satellite, spinning in storage, provides a resource for studying these distributions over several years time. Fitting the pitch angle (α) information to a sin^{n}α function for each 8 minute period spin allows us to correlate the changes in distribution to magnetic field measurements, geomagnetic indices and solar wind parameters. Changes in the fitting parameter, n, over time appear to correlate well with magnetic field variations, consistent with drift shell splitting arguments, while asymmetric changes in n seen on either the dayside or nightside may suggest energization or loss of electrons in particular L-shell ranges. These results provide clues as to the relative contributions of internal source and loss processes versus large scale variations due to processes such as magnetic field reconfiguration and magnetopause shadowing.

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