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The Connection Between Transpolar Arcs and Magnetotail Rotation
KTH, Superseded Departments, Alfvén Laboratory.ORCID iD: 0000-0002-0349-0645
2000 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 27, 73-76 p.Article in journal (Refereed) Published
Abstract [en]

Recent observations show that the evolution of transpolar arcs (TPA's) are often associated with a sign change of the dawn-dusk component of the interplanetary magnetic field (IMF). It is known that a nonzero IMF B-y causes a twist of the tail plasma sheet. In this study it is assumed that a sign change of IMF B-y causes the magnetotail to rotate until the entire tail is twisted in the opposite direction. To examine a possible connection between TPA's and tail rotation the Tsyganenko 1989 model is modified such that the near-Earth tail and the far tail are twisted in opposite directions. Mapping from the tail current sheet to the ionosphere shows a separated region of closed field lines that extends into the polar cap. This separated part may be interpreted as the mapped region of a TPA.

Place, publisher, year, edition, pages
2000. Vol. 27, 73-76 p.
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-95045DOI: 10.1029/1999GL010675ISI: 000084719300020OAI: diva2:526461
QC 20120619Available from: 2012-05-11 Created: 2012-05-11 Last updated: 2012-06-19Bibliographically approved

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Kullen, Anita
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