The Harang reversal and the interchange stability of the magnetotail

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dc.citation.firstpage3278en_US
dc.citation.issueNumber4en_US
dc.citation.journalTitleJournal of Geophysical Research: Space Physicsen_US
dc.citation.lastpage3292en_US
dc.citation.volumeNumber121en_US
dc.contributor.authorOhtani, Shinichien_US
dc.contributor.authorGkioulidou, Matinaen_US
dc.contributor.authorWang, Chih-Pingen_US
dc.contributor.authorWolf, Richard A.en_US
dc.date.accessioned2017-05-03T18:24:05Zen_US
dc.date.available2017-05-03T18:24:05Zen_US
dc.date.issued2016en_US
dc.description.abstractThe 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 pVĪ³ 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.en_US
dc.identifier.citationOhtani, Shinichi, Gkioulidou, Matina, Wang, Chih-Ping, et al.. "The Harang reversal and the interchange stability of the magnetotail." <i>Journal of Geophysical Research: Space Physics,</i> 121, no. 4 (2016) Wiley: 3278-3292. https://doi.org/10.1002/2015JA022025.en_US
dc.identifier.doihttps://doi.org/10.1002/2015JA022025en_US
dc.identifier.urihttps://hdl.handle.net/1911/94134en_US
dc.language.isoengen_US
dc.publisherWileyen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.titleThe Harang reversal and the interchange stability of the magnetotailen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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