Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm43b..06b&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM43B-06
Physics
2716 Energetic Particles: Precipitating, 2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2772 Plasma Waves And Instabilities (2471), 7867 Wave/Particle Interactions (2483, 6984)
Scientific paper
The recent discovery of large amplitude (1 nT) chorus has prompted questions regarding the boundaries of applicability of quasilineat theory, traditionally employed in the study of radiation-belt dynamics. In this talk, we use a general, relativistic, oblique, test-particle code to evaluate the effect of large amplitude chorus on energetic, radiation-belt electrons. Three cases are examined: (A) low-amplitude waves interacting at low- latitudes, exhibit the expected, linear scattering which leads to large-scale diffusive behavior. (B) large- amplitude waves interacting at low-latitudes result in monotonic decreases in pitch-angle and energy due to a resonance dislocation effect, leading to large-scale de-energization and particle loss. (C) large-amplitude waves interacting obliquely at high latitudes, result in a combination of the above behaviors, as well as nonlinear phase-trapping which leads to rapid, dramatic increases in both energy and pitch-angle of a small portion of the test-particles. These results suggest that the intensity of individual, discrete wave elements is critical for quantifying the large-scale dynamics of the radiation-belts.
Bortnik Jacob
Inan Umran S.
Mansergh Thorne Richard
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