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Observations of turbulence in a Kelvin-Helmholtz event on 8 September 2015 by the Magnetospheric Multiscale mission
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2016 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 121, no 11, p. 11021-11034Article in journal (Refereed) Published
Abstract [en]

Spatial and high-time-resolution properties of the velocities, magnetic field, and 3-D electric field within plasma turbulence are examined observationally using data from the Magnetospheric Multiscale mission. Observations from a Kelvin-Helmholtz instability (KHI) on the Earth's magnetopause are examined, which both provides a series of repeatable intervals to analyze, giving better statistics, and provides a first look at the properties of turbulence in the KHI. For the first time direct observations of both the high-frequency ion and electron velocity spectra are examined, showing differing ion and electron behavior at kinetic scales. Temporal spectra exhibit power law behavior with changes in slope near the ion gyrofrequency and lower hybrid frequency. The work provides the first observational evidence for turbulent intermittency and anisotropy consistent with quasi two-dimensional turbulence in association with the KHI. The behavior of kinetic-scale intermittency is found to have differences from previous studies of solar wind turbulence, leading to novel insights on the turbulent dynamics in the KHI.

Place, publisher, year, edition, pages
Blackwell Publishing, 2016. Vol. 121, no 11, p. 11021-11034
Keywords [en]
collisionless plasma turbulence, Kelvin-Helmholtz instability, magnetopause
National Category
Geophysics
Identifiers
URN: urn:nbn:se:kth:diva-199969DOI: 10.1002/2016JA023458ISI: 000390403400026Scopus ID: 2-s2.0-85006257470OAI: oai:DiVA.org:kth-199969DiVA, id: diva2:1067182
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QC 20170120

Available from: 2017-01-20 Created: 2017-01-20 Last updated: 2017-11-13Bibliographically approved

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Lindqvist, Per-ArneMarklund, Göran T.
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