Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm34a..02s&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM34A-02
Physics
2716 Energetic Particles: Precipitating, 2720 Energetic Particles: Trapped, 2774 Radiation Belts
Scientific paper
Fluxes of relativistic (~MeV) electrons in the Earth's radiation belts are highly variable on time scales from a few hours to months. Even similar geomagnetic storms show variability, either increasing or decreasing the measured relativistic electron flux. This variability in flux represents a dynamic balance between acceleration of new electrons to high energies and losses of the existing population. Losses set the boundaries for the belts and can be strong enough to deplete relativistic electron populations in the belts on the order of a day. This talk will review direct observations of losses as well as those inferred from flux dropouts and we will examine the proposed source of these losses including adiabatic motion, drift out the magnetopause, outward radial diffusion, and scattering into the atmosphere by resonance with EMIC, whistler mode waves and plasmaspheric hiss. The ability to identify and quantify the time and space dependent importance of these loss processes is essential to understanding the flux variability of radiation belt relativistic electrons.
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