Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 47, Issue 4, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2019GL086318
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Funding
- NASA [NNX15AF57G, NNX16AG69G, NNX17AD36G, NNX17AI55G]
- Van Allen Probes (RBSP) under NASA [NAS5-01072]
- EMFISIS investigation under JHU/APL [921647]
- RBSP-ECT under JHU/APL [967399]
- EFW investigation under JHU/APL [921647]
- NASA [904219, NNX16AG69G, NNX15AF57G, 805007, 1002523, NNX17AD36G] Funding Source: Federal RePORTER
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We show that broadband low-frequency Alfvenic field variations observed in the inner-magnetosphere from the Van Allen Probes during geomagnetically disturbed intervals are composed of multiscale current sheets, current filaments, flow shears, and vortices. These observations pertain to spacecraft frame frequencies (f(sc)) over the range 0.1 < f(sc) < 10 Hz and correspond to structure advected over the spacecraft on scales (lambda) over the range 0.1 less than or similar to lambda/rho(i) less than or similar to 10. where rho(i) is the average ion gyroradius. The topology of the current and flow is derived via time domain and spectral approaches adapted for the interpretation of advected structure. The results reveal the action of magnetic and convective nonlinearities in the generation of broadband Alfvenic fluctuations prevalent in the inner magnetosphere during active times. The observed current filamentation and rotational vorticity is suggestive of how broadband Alfvenic field variations on kinetic scales are driven and support geophysically significant particle acceleration in the inner magnetosphere.
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