Turbulence properties and kinetic signatures of electron in Kelvin-Helmholtz waves during a geomagnetic storm
arxiv(2024)
摘要
We present a comprehensive study of Magnetospheric Multiscale (MMS)
spacecraft encounter with KHI during a geomagnetic storm, focusing on
elucidating key turbulence properties and reconnection signatures observed at
the edges of KH vortices. The spectral slope for electric field stays
approximately constant for frequencies below the ion cyclotron frequency and
exhibits a break around the lower hybrid frequency, indicating wave activity.
Furthermore, MMS observes a current sheet accompanied by intense electron jets
and features consistent with strong guide-field asymmetric reconnection across
the magnetopause. Substantial agyrotropy (by a factor of 10) in electron
distribution functions is observed in the reconnecting current sheet and at the
edges of KH. Our observation presents a multi-scale view into KH turbulence
under strongly driven conditions and into the dynamics occurring at electron
dissipation scales.
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