The interaction between transpolar arcs and cusp spots


Fear, R.C., Milan, S.E., Carter, J.A. and Maggiolo, R. (2015) The interaction between transpolar arcs and cusp spots Geophysical Research Letters, 42, (22), pp. 9685-9693. (doi:10.1002/2015GL066194).

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Description/Abstract

Transpolar arcs and cusp spots are both auroral phenomena which occur when the interplanetary magnetic field is northward. Transpolar arcs are associated with magnetic reconnection in the magnetotail, which closes magnetic flux and results in a “wedge” of closed flux which remains trapped, embedded in the magnetotail lobe. The cusp spot is an indicator of lobe reconnection at the high-latitude magnetopause; in its simplest case, lobe reconnection redistributes open flux without resulting in any net change in the open flux content of the magnetosphere. We present observations of the two phenomena interacting—i.e., a transpolar arc intersecting a cusp spot during part of its lifetime. The significance of this observation is that lobe reconnection can have the effect of opening closed magnetotail flux. We argue that such events should not be rare.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1002/2015GL066194
ISSNs: 0094-8276 (print)
Organisations: Astronomy Group
ePrint ID: 392777
Date :
Date Event
2 November 2015Accepted/In Press
25 November 2015e-pub ahead of print
28 November 2015Published
Date Deposited: 15 Apr 2016 15:54
Last Modified: 09 Jun 2017 10:33
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/392777

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