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On the formation of the high-altitude stagnant cusp : Cluster observations

Bogdanova, Y. V. and Marchaudon, A. and Owen, C. J. and Dunlop, M. W. and Frey, H. U. and Fazakerley, A. N. and Klecker, B. and Davies, J. A. and Wild, J. A. and Milan, S. E. and Rème, H. and Balogh, A. (2005) On the formation of the high-altitude stagnant cusp : Cluster observations. Geophysical Research Letters, 32 (12). ISSN 0094-8276

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    On 16 March 2002, Cluster moved from nightside to dayside, across the high-altitude northern cusp during an extended period of relatively steady positive IMF BY and BZ. Combined Cluster and SuperDARN data imply the existence of two reconnection sites: in the high-latitude northern hemisphere dusk and southern hemisphere dawn sectors. Within the cusp, Cluster encounters 3 distinct plasma regions. First, injections of magnetosheath-like plasma associated with dawnward and sunward convection suggest Cluster crosses newly-reconnected field lines related to the dusk reconnection site. Second, Cluster observes a Stagnant Exterior Cusp (SEC), characterized by nearly isotropic and stagnant plasma. Finally, Cluster crosses a region with significant anti- field-aligned flows. We suggest the observed SEC may be located on newly re-closed field lines, reconnected first poleward of the northern hemisphere cusp and later reconnected again poleward of the southern hemisphere cusp. We discuss how the Cluster observations correspond to expectations of ’double reconnection’ model.

    Item Type: Journal Article
    Journal or Publication Title: Geophysical Research Letters
    Additional Information: Copyright 2005 American Geophysical Union.
    Subjects: ?? qb ??
    Departments: Faculty of Science and Technology > School of Computing & Communications
    Faculty of Science and Technology > Physics
    ID Code: 6663
    Deposited By: ep_importer_dcs
    Deposited On: 21 Apr 2008 11:49
    Refereed?: Yes
    Published?: Published
    Last Modified: 22 Jun 2018 00:13
    Identification Number:

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