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Convection electric field and plasma convection in a twisted magnetotail: t THEMIS case study 1-2 January 2009
Umeå University, Faculty of Science and Technology, Department of Physics. Institute of Space Sciences, Shandong University, Weihai, China.ORCID iD: 0000-0002-5681-0366
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-2043-4442
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2018 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 123, no 9, p. 7486-7497Article in journal (Refereed) Published
Abstract [en]

We investigate THEMIS satellite measurements made in a tail-aligned constellation during a time interval on 1-2 January 2009, which has previously been attributed to an interval of an interplanetary magnetic fieldB(y)-driven magnetotail twisting. We find evidence for that the orientation of the convection electric field in the tail is twist-mode dependent. For earthward flow and a negative twist (induced tail B-y < 0), the electric field is found to have northward E-z and tailward E-x components. During a positive twist (induced tail B-y > 0), the directions of E-z and E-x are reversed. The E-y component shows the expected dawn-to-dusk direction for earthward flow. The electric field components preserve their orientation across the neutral sheet, and a quasi-collinear field is observed irrespective to the tail distance. The electric field associated with the tailward flow has an opposite direction compared to the earthward flow for the negative twist. For the positive twist, the results are less clear. The corresponding plasma convection and thus the magnetic flux transport have an opposite dawn-dusk direction above and below the neutral sheet. The directions depend on the tail twist mode. The hemispherically asymmetric earthward plasma flows are suggested to be a manifestation of an asymmetric Dungey cycle in a twisted magnetotail. The role of tailward flows deserve further investigation.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2018. Vol. 123, no 9, p. 7486-7497
National Category
Fusion, Plasma and Space Physics Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:umu:diva-153821DOI: 10.1029/2018JA025688ISI: 000448376600025OAI: oai:DiVA.org:umu-153821DiVA, id: diva2:1269849
Available from: 2018-12-11 Created: 2018-12-11 Last updated: 2018-12-11Bibliographically approved

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Pitkänen, TimoHamrin, MariaDe Spiegeleer, Alexandre

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