Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm21a0329s&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM21A-0329
Physics
2716 Energetic Particles: Precipitating, 2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2753 Numerical Modeling, 2774 Radiation Belts
Scientific paper
In this study parameterizations for the loss of the radiation belt electrons to the atmosphere due to the resonant pitch-angle scattering by chorus waves are developed. By analyzing the dependence of the loss rates on L-value and energy we find dependencies for the lifetime of the radiation belt electrons. Parameters of the functional dependences are obtained using a linear regression technique. To create parameterizations of loss rate as a function of geomagnetic indices, we also analyzed the statistical data from day-side lower band chorus observations in the range of geomagnetic latitudes from 20° to 30°. The combined parameterizations of the wave amplitudes and scattering rates indicate that electron loss due to chorus waves strongly depends on energy and geomagnetic activity. During storm-time conditions the lifetimes of relativistic electrons, in the heart of the outer zone are on the order of a day and are on the scale of hours at lower energies. The developed parameterizations may be used in particle tracing codes and radial diffusion codes.
Meredith Nick
Shprits Yuri Y.
Thorne Robert
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