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dc.contributor.authorOhtani, Shinichi
Gkioulidou, Matina
Wang, Chih-Ping
Wolf, Richard A.
dc.date.accessioned 2017-05-03T18:24:05Z
dc.date.available 2017-05-03T18:24:05Z
dc.date.issued 2016
dc.identifier.urihttp://hdl.handle.net/1911/94134
dc.description.abstract The present study addresses steady convection in the plasma sheet in terms of the interchange stability with special attention to the Harang reversal. The closure of the tail current with a field-aligned current (FAC) results from the divergence/convergence of the pressure gradient current. If the magnetotail is in a steady state, the associated change of local plasma pressure p has to balance with its advective change. Accordingly, for adiabatic transport, the flux tube entropy parameter pVγ increases and decreases along the convection path in regions corresponding to downward and upward FACs, respectively. This requirement, along with the condition for the interchange stability imposes an important constraint on the direction of convection especially in the regions of downward FACs. It is deduced that for the dusk cell, the convection in the downward R2 current has to be directed azimuthally duskward, which follows the sunward, possibly dawnward deflected, convection in the region of the premidnight upward R1 current. This duskward turn of convection takes place in the vicinity of the R1-R2 demarcation, and it presumably corresponds to the Harang reversal. For the dawn cell the convection in the postmidnight downward R1 current has to deflect dawnward, and then it proceeds sunward in the upward R2 current. The continuity of the associated ionospheric currents consistently reproduces the assumed FAC distribution. The proposed interrelationships between the convection and FACs are also verified with a quasi-steady plasma sheet configuration and convection reproduced by a modified Rice Convection Model with force balance.
dc.language.iso eng
dc.title The Harang reversal and the interchange stability of the magnetotail
dc.type Journal article
dc.citation.journalTitle Journal of Geophysical Research: Space Physics
dc.citation.volumeNumber 121
dc.citation.issueNumber 4
dc.contributor.publisher Wiley
dc.type.dcmi Text
dc.identifier.doihttps://doi.org/10.1002/2015JA022025
dc.type.publication publisher version
dc.citation.firstpage 3278
dc.citation.lastpage 3292
dc.identifier.citation Ohtani, Shinichi, Gkioulidou, Matina, Wang, Chih-Ping and et al.. "The Harang reversal and the interchange stability of the magnetotail." Journal of Geophysical Research: Space Physics, 121, no. 4 (2016) 3278-3292. https://doi.org/10.1002/2015JA022025.


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