Magnetic Reconnection Inside a Flux Rope Induced by Kelvin-Helmholtz Vortices.

Autor: Hwang KJ; Southwest Research Institute San Antonio TX USA., Dokgo K; Southwest Research Institute San Antonio TX USA., Choi E; Southwest Research Institute San Antonio TX USA., Burch JL; Southwest Research Institute San Antonio TX USA., Sibeck DG; NASA Goddard Space Flight Center Greenbelt MD USA., Giles BL; NASA Goddard Space Flight Center Greenbelt MD USA., Hasegawa H; Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Japan., Fu HS; School of Science and Environment Beihang University Beijing China., Liu Y; School of Science and Environment Beihang University Beijing China., Wang Z; School of Science and Environment Beihang University Beijing China., Nakamura TKM; Austrian Academy of Sciences ÖAW Space Research Institute Graz Austria., Ma X; Physical Sciences Department Embry-Riddle Aeronautical University Daytona Beach FL USA., Fear RC; School of Physics and Astronomy University of Southampton Southampton UK., Khotyaintsev Y; Swedish Institute of Space Physics Uppsala Sweden., Graham DB; Swedish Institute of Space Physics Uppsala Sweden., Shi QQ; School of Earth and Space Sciences Peking University Peking China., Escoubet CP; European Space Research and Technology Centre Noordwijk the Netherlands., Gershman DJ; NASA Goddard Space Flight Center Greenbelt MD USA., Paterson WR; NASA Goddard Space Flight Center Greenbelt MD USA., Pollock CJ; Denali Scientific, LLC Fairbanks AK USA., Ergun RE; Laboratory for Atmospheric and Space Physics University of Colorado at Boulder Boulder CO USA., Torbert RB; Space Science Center University of New Hampshire Durham NH USA., Dorelli JC; NASA Goddard Space Flight Center Greenbelt MD USA., Avanov L; NASA Goddard Space Flight Center Greenbelt MD USA.; The Goddard Planetary Heliophysics Institute University of Maryland, Baltimore County Baltimore MD USA., Russell CT; Institute of Geophysics and Planetary Physics University of California, Los Angeles Los Angeles CA USA., Strangeway RJ; Institute of Geophysics and Planetary Physics University of California, Los Angeles Los Angeles CA USA.
Jazyk: angličtina
Zdroj: Journal of geophysical research. Space physics [J Geophys Res Space Phys] 2020 Apr; Vol. 125 (4), pp. e2019JA027665. Date of Electronic Publication: 2020 Apr 08.
DOI: 10.1029/2019JA027665
Abstrakt: On 5 May 2017, MMS observed a crater-type flux rope on the dawnside tailward magnetopause with fluctuations. The boundary-normal analysis shows that the fluctuations can be attributed to nonlinear Kelvin-Helmholtz (KH) waves. Reconnection signatures such as flow reversals and Joule dissipation were identified at the leading and trailing edges of the flux rope. In particular, strong northward electron jets observed at the trailing edge indicated midlatitude reconnection associated with the 3-D structure of the KH vortex. The scale size of the flux rope, together with reconnection signatures, strongly supports the interpretation that the flux rope was generated locally by KH vortex-induced reconnection. The center of the flux rope also displayed signatures of guide-field reconnection (out-of-plane electron jets, parallel electron heating, and Joule dissipation). These signatures indicate that an interface between two interlinked flux tubes was undergoing interaction, causing a local magnetic depression, resulting in an M-shaped crater flux rope, as supported by reconstruction.
(©2020. The Authors.)
Databáze: MEDLINE
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