Kinetic Range Spectral Features of Cross Helicity Using the Magnetospheric Multiscale Spacecraft.
Phys Rev Lett
; 121(26): 265101, 2018 Dec 28.
Article
em En
| MEDLINE
| ID: mdl-30636132
ABSTRACT
We study spectral features of ion velocity and magnetic field correlations in the magnetosheath and in the solar wind using data from the Magnetospheric Multiscale (MMS) spacecraft. High-resolution MMS observations enable the study of the transition of these correlations between their magnetofluid character at larger scales into the subproton kinetic range, previously unstudied in spacecraft data. Cross-helicity, angular alignment, and energy partitioning is examined over a suitable range of scales, employing measurements based on the Taylor frozen-in approximation as well as direct two-spacecraft correlation measurements. The results demonstrate signatures of alignment at large scales. As kinetic scales are approached, the alignment between v and b is destroyed by demagnetization of protons.
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MEDLINE
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2018
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Article