The Connection Between Transpolar Arcs and Magnetotail Rotation
2000 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 27, 73-76 p.Article in journal (Refereed) Published
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.
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-95045DOI: 10.1029/1999GL010675ISI: 000084719300020OAI: oai:DiVA.org:kth-95045DiVA: diva2:526461
QC 201206192012-05-112012-05-112012-06-19Bibliographically approved