期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 4, 页码 1085-1092出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013GL059132
关键词
plasmaspheric hiss; electron precipitation; infer hiss wave amplitudes
资金
- JHU/APL under NASA [967399, 921647, NAS5-01072]
- EMFISIS [1001057397: 01]
- ECT [13-041]
- NASA [NNX11AD75G, NNX11AR64G, NNX13AI61G]
We analyze a conjunction event between the Van Allen Probes and the low-altitude Polar Orbiting Environmental Satellite (POES) to quantify hiss-driven energetic electron precipitation. A physics-based technique based on quasi-linear diffusion theory is used to estimate the ratio of precipitated and trapped electron fluxes (R), which could be measured by the two-directional POES particle detectors, using wave and plasma parameters observed by the Van Allen Probes. The remarkable agreement between modeling and observations suggests that this technique is applicable for quantifying hiss-driven electron scattering near the bounce loss cone. More importantly, R in the 100-300keV energy channel measured by multiple POES satellites over a broad L magnetic local time region can potentially provide the spatiotemporal evolution of global hiss wave intensity, which is essential in evaluating radiation belt electron dynamics, but cannot be obtained by in situ equatorial satellites alone.
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