Energetic electron spectra and flux isotropization during different phases of solar cycle

Details Energetic electron spectra and flux isotropization during different phases of solar cycle Energetic electron spectra and flux isotropization during different phases of solar cycle

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm43b1490k&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM43B-1490

Physics

2774 Radiation Belts

Scientific paper

We will report here on the measurements of electron spectra and flux isotropization during electron energization events. We will present the results of investigating the dependence of electron spectra and flux isotropization upon solar cycle phase. It is well known that high speed solar wind streams dominate during the descending phase of the solar cycle whereas coronal mass ejections are the dominant driver of the magnetosphere during the ascending phase. Temporal evolution of electron spectra and flux isotropization may be important discriminators of models of electron energization in the Earth's outer zone. For example, radial diffusion preferentially energizes electrons of large equatorial pitch angles whereas some in-situ wave-particle energization mechanisms include concomittant pitch angle scattering leading to rapid flux isotropization. The systematics of electron energization due to different drivers may shed light upon the underlying physical processes. We will use data collected by detectors onboard SAMPEX in low earth orbit and Polar which measures electron fluxes at higher altitude to characterize flux isotropization. Electron spectra are obtained by the use of pulse height analyzed data from the PET detector onboard SAMPEX. We will use global field models such as the Tsyaganenko-04 model, to calculate thegeneralized L parameter during geomagnetically disturbed times. SAMPEX measurements cover the entire outer zone for more than a decade from mid 1992 to mid 2004 and Polar covers the time period from mid 1996 to the present.

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