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New Insights into the Nature of Turbulence in the Earth's Magnetosheath Using Magnetospheric MultiScale Mission Data
Univ Paris Sud, Sorbonne Univ, Ecole Polytech, Lab Phys Plasmas,UMR7648,CNRS, Paris, France..
UPMC Univ Paris 06, Univ Paris Diderot, PSL Res Univ, LESIA Observ Paris,CNRS, Meudon, France..
Univ New Hampshire, Durham, NH 03824 USA..
Univ Paris Sud, Sorbonne Univ, Ecole Polytech, Lab Phys Plasmas,UMR7648,CNRS, Paris, France..
Vise andre og tillknytning
2018 (engelsk)Inngår i: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 859, nr 2, artikkel-id 127Artikkel i tidsskrift (Fagfellevurdert) Published
Fritextbeskrivning
Abstract [en]

The Earth's magnetosheath, which is characterized by highly turbulent fluctuations, is usually divided into two regions of different properties as a function of the angle between the interplanetary magnetic field and the shock normal. In this study, we make use of high-time resolution instruments on board the Magnetospheric MultiScale spacecraft to determine and compare the properties of subsolar magnetosheath turbulence in both regions, i. e., downstream of the quasi-parallel and quasi-perpendicular bow shocks. In particular, we take advantage of the unprecedented temporal resolution of the Fast Plasma Investigation instrument to show the density fluctuations down to sub-ion scales for the first time. We show that the nature of turbulence is highly compressible down to electron scales, particularly in the quasi-parallel magnetosheath. In this region, the magnetic turbulence also shows an inertial (Kolmogorov-like) range, indicating that the fluctuations are not formed locally, in contrast with the quasi-perpendicular magnetosheath. We also show that the electromagnetic turbulence is dominated by electric fluctuations at sub-ion scales (f > 1Hz) and that magnetic and electric spectra steepen at the largest-electron scale. The latter indicates a change in the nature of turbulence at electron scales. Finally, we show that the electric fluctuations around the electron gyrofrequency are mostly parallel in the quasi-perpendicular magnetosheath, where intense whistlers are observed. This result suggests that energy dissipation, plasma heating, and acceleration might be driven by intense electrostatic parallel structures/waves, which can be linked to whistler waves.

sted, utgiver, år, opplag, sider
IOP PUBLISHING LTD , 2018. Vol. 859, nr 2, artikkel-id 127
Emneord [en]
acceleration of particles, Earth, planets and satellites: magnetic fields, plasmas, turbulence waves
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-230828DOI: 10.3847/1538-4357/aabae8ISI: 000433938500026Scopus ID: 2-s2.0-85048305743OAI: oai:DiVA.org:kth-230828DiVA, id: diva2:1220645
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QC 20180619

Tilgjengelig fra: 2018-06-19 Laget: 2018-06-19 Sist oppdatert: 2019-06-13bibliografisk kontrollert

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