Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm33b..07f&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM33B-07
Physics
2700 Magnetospheric Physics, 2716 Energetic Particles, Precipitating, 2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2760 Plasma Convection
Scientific paper
The dynamic variation of the electrons in the outer radiation belts has been observed for many years, but the cause of this variation has not been clearly understood. The adiabatic effect due to ring current evolution is not sufficient to account for flux changes during storm phases. Thus, addition processes have been invoked to explain these variations, chiefly the radial diffusion of electrons conserving the first and second adiabatic invariants, where the electrons are accelerated through the betatron and fermi processes, and perhaps with enhanced transport enabled by ULF waves. More recently, local heating inside the radiation belts has been proposed to explain the energization of electrons. However, the exact mechanism that produces the lower energy seed population and converts them to energetic radiation belt electrons has not yet been clarified. In this presentation we will examine the current understanding of the processes which accelerate electrons into the radiation belts with particular emphasis on the role of non-adiabatic processes. The energies that electrons can acquire via radial diffusion are determined using data from ISEE and CRRES, and samples of spectra are examined at various L-values to identify the deficiencies in phase space density. This will determine the extent to which non-adiabatic processes are required to achieve the observed radiation belt energies. We have found strong evidence supporting recent suggestions that non-adiabatic (first invariant breaking) processes are required to explain the generation of the outer belt during intense storm events. We will report on the relative importance of non-adiabatic processes during more typical outer belt conditions.
Bernard Blake J.
Fox Nicola J.
Mauk B. M.
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