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Volume 27, issue 5
Ann. Geophys., 27, 2019–2025, 2009
https://doi.org/10.5194/angeo-27-2019-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Ninth International Conference on Substorms (ICS9)

Ann. Geophys., 27, 2019–2025, 2009
https://doi.org/10.5194/angeo-27-2019-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  04 May 2009

04 May 2009


Global observations of substorm injection region evolution: 27 August 2001

E. Spanswick1, E. Donovan1, W. Liu2, J. Liang2, J. B. Blake3, G. Reeves4, R. Friedel4, B. Jackel1, C. Cully5, and A. Weatherwax6 E. Spanswick et al.
  • 1University of Calgary, Calgary, Alberta, Canada
  • 2Canadian Space Agency, St.-Hubert, Quebec, Canada
  • 3Aero Space, Los Angeles, California, USA
  • 4Los Alamos National Laboratory, Los Alamos, NM, USA
  • 5Swedish Institute of Space Physics, Uppsala, Sweden
  • 6Siena Collage, New York, USA

Abstract. We present riometer and in situ observations of a substorm electron injection on 27 August 2001. The event is seen at more than 20 separate locations (including ground stations and 6 satellites: Cluster, Polar, Chandra, and 3 Los Alamos National Laboratory (LANL) spacecraft). The injection is observed to be dispersionless at 12 of these locations. Combining these observations with information from the GOES-8 geosynchronous satellite we argue that the injection initiated near geosynchronous orbit and expanded poleward (tailward) and equatorward (earthward) afterward. Further, the injection began several minutes after the reconnection identified in the Cluster data, thus providing concrete evidence that, in at least some events, near-Earth reconnection has little if any ionospheric signature.

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