Filamentary Currents and Alfvénic Vortices in the Inner Magnetosphere. Issue 4 (14th February 2020)

• Record Type: Journal Article
• Authors: Chaston, C. C.; Bonnell, J. W.; Wygant, J. R.; Reeves, G. D.; Baker, D. N.
• Is Part Of: Geophysical research letters. Volume 47:Issue 4(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-02-14
• Subjects: Alfven waves -- turbulence -- radiation belts -- ring current -- geomagnetic stormsVan Allen Probes; Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1029/2019GL086318
• Languages: English
• ISSNs: 0094-8276

Abstract

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 ( f sc ) over the range 0.1 < f sc < 10 Hz and correspond to structure advected over the spacecraft on scales ( λ ) over the range 0.1 ≲ λ / ρ i ≲ 10. where ρ 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 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. Key Points: Broadband inner magnetospheric Alfvén waves are composed of multiscale sheet and filamentary currents, flow shears, and vortices The field and flow topology in broadband Alfvénic fluctuations is symptomatic of the action of magnetic and convective nonlinearities The multiscale rotational field and flow topology suggests that cross‐scale energy transport supports particle acceleration