We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK


93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Mechanism for the formation of the high-altitud...
View graph of relations

« Back

Mechanism for the formation of the high-altitude stagnant cusp: Cluster and SuperDARN observations

Research output: Contribution to conferenceOther


  • Y.V. Bogdanova
  • A. Marchaudon
  • C.J. Owen
  • M.W. Dunlop
  • H.U. Frey
  • J.A. Wild
  • A.N. Fazakerley
  • B. Klecker
  • J.A. Davies
  • S.E. Milan
  • Karen Fletcher (Editor)
Publication date01/2006
Number of pages0
Original languageEnglish


ConferenceProceedings of the Cluster and Double Star Symposium: 5th Anniversary of Cluster in Space
Period1/01/00 → …


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 antifield-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.