Observational constraints on relativistic electron dynamics: temporal evolution of electron spectra and flux isotropization

Details Observational constraints on relativistic electron dynamics: temporal evolution of electron spectra and flux isotropization Observational constraints on relativistic electron dynamics: temporal evolution of electron spectra and flux isotropization

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsm53a..03k&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SM53A-03

Physics

2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2774 Radiation Belts

Scientific paper

Models of energization of electrons in the Earth's outer radiation belts invoke two classes of processes, radial transport and in-situ wave-particle interactions. Temporal evolution of electron spectra and flux isotropization during energization events provide useful observational constraints on models of electron energization. Events dominated by radial diffusion result in pancake type pitch angle distributions whereas some in-situ wave-particle energization mechanisms include pitch angle scattering leading to rapid flux isotropization. We present a survey of flux isotrpization time scales and electron spectra during relativstic electron enhancement events. We will use data collected by detectors onboard SAMPEX in low earth orbit and Polar which measures electron fluxes at higher altitude to measure flux isotropization. Electron spectra are obtained by pulse height analyzed data from the PET detector onboard SAMPEX.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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