Filamentary Currents and Alfvénic Vortices in the Inner Magnetosphere

C. C. Chaston, J. W. Bonnell, J. R. Wygant, G. D. Reeves, D. N. Baker

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We show that broadband low-frequency Alfvénic 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 (fsc) over the range 0.1 < fsc < 10 Hz and correspond to structure advected over the spacecraft on scales (λ) over the range 0.1 ≲ λ/ρi ≲ 10. where ρi 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 Alfvénic fluctuations prevalent in the inner magnetosphere during active times. The observed current filamentation and rotational vorticity is suggestive of how broadband Alfvénic field variations on kinetic scales are driven and support geophysically significant particle acceleration in the inner magnetosphere.

Original languageEnglish (US)
Article numbere2019GL086318
JournalGeophysical Research Letters
Volume47
Issue number4
DOIs
StatePublished - Feb 28 2020

Keywords

  • Alfven waves
  • geomagnetic stormsVan Allen Probes
  • radiation belts
  • ring current
  • turbulence

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