期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 2, 页码 209-215出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013GL058507
关键词
alfven waves; field lines resonances; injections; particle accleration; kinetic effects
资金
- NASA [NNX11AD78G, NAS5-01072]
- EFW investigation
- Emfisis under JHU/APL [921647]
- RBSP-ECT JHU/APL [967399]
- Australian Research Council [FT110100316]
- NASA [148582, NNX11AD78G] Funding Source: Federal RePORTER
- Australian Research Council [FT110100316] Funding Source: Australian Research Council
We identify electromagnetic field variations from the Van Allen Probes which have the properties of Doppler shifted kinetic scale Alfvenic field line resonances. These variations are observed during injections of energetic plasmas into the inner magnetosphere. These waves have scale sizes perpendicular to the magnetic field which are determined to be of the order of an ion gyro-radius ((i)) and less. Cross-spectral analysis of the electric and magnetic fields reveals phase transitions at frequencies correlated with enhancements and depressions in the ratio of the electric and magnetic fields. Modeling shows that these observations are consistent with the excitation of field-line resonances over a broad range of wave numbers perpendicular to the magnetic field (k) extending to k(i)>> 1. The amplitude of these waves is such that E/B-oi/k (E,B-o, and (i) are the wave amplitude, background field strength, and ion gyro-frequency, respectively) leading to ion demagnetization and acceleration for multiple transitions through the wave potential.
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