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Magnetospheric Multiscale Observations of Electron Vortex Magnetic Hole in the Turbulent Magnetosheath Plasma
Vise andre og tillknytning
2017 (engelsk)Inngår i: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 836, nr 2, artikkel-id L27Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We report on the observations of an electron vortex magnetic hole corresponding to a new type of coherent structure in the turbulent magnetosheath plasma using the Magnetospheric Multiscale mission data. The magnetic hole is characterized by a magnetic depression, a density peak, a total electron temperature increase (with a parallel temperature decrease but a perpendicular temperature increase), and strong currents carried by the electrons. The current has a dip in the core region and a peak in the outer region of the magnetic hole. The estimated size of the magnetic hole is about 0.23 ρi (∼30 ρe) in the quasi-circular cross-section perpendicular to its axis, where ρi and ρe are respectively the proton and electron gyroradius. There are no clear enhancements seen in high-energy electron fluxes. However, there is an enhancement in the perpendicular electron fluxes at 90° pitch angle inside the magnetic hole, implying that the electrons are trapped within it. The variations of the electron velocity components Vem and Ven suggest that an electron vortex is formed by trapping electrons inside the magnetic hole in the cross-section in the M-N plane. These observations demonstrate the existence of a new type of coherent structures behaving as an electron vortex magnetic hole in turbulent space plasmas as predicted by recent kinetic simulations.

sted, utgiver, år, opplag, sider
Institute of Physics Publishing , 2017. Vol. 836, nr 2, artikkel-id L27
Emneord [en]
Earth, planets and satellites: magnetic fields, planets and satellites: terrestrial planets, plasmas, turbulence
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-208003DOI: 10.3847/2041-8213/aa5f50ISI: 000396007700001Scopus ID: 2-s2.0-85014407410OAI: oai:DiVA.org:kth-208003DiVA, id: diva2:1106828
Merknad

QC 2017-06-08

Tilgjengelig fra: 2017-06-08 Laget: 2017-06-08 Sist oppdatert: 2017-11-10bibliografisk kontrollert

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