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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 24, issue 12
Ann. Geophys., 24, 3497–3505, 2006
https://doi.org/10.5194/angeo-24-3497-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 24, 3497–3505, 2006
https://doi.org/10.5194/angeo-24-3497-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.

  21 Dec 2006

21 Dec 2006

Remote sensing of a near-Earth neutral line during the 5 October 2000 substorm

D. Nagata1, S. Machida1, S. Ohtani2, S. B. Mende3, Y. Saito4, and T. Mukai4 D. Nagata et al.
  • 1Department of Geophysics, Kyoto University, Kyoto 606-8502, Japan
  • 2Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723, USA
  • 3Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA
  • 4Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa 229-8510, Japan

Abstract. In this paper we examined the continuous motions of a near-Earth neutral line during the recovery phase of the 5 October 2000 substorm. Estimation was based on the PSBL ion beam model proposed by Onsager (1991) and the Geotail observations. Estimated distances from the Earth ranged from 20 to 60 RE and retreated tailward at velocities of 250 and 300 km/s. This event initiated with the arrival of solar wind discontinuity. Simultaneous observations of electromagnetic field and electrons indicate the existence of earthward propagating waves associated with field-aligned currents. Based on these observations, we suggest that the source of the PSBL ion beams was the retreating near-Earth neutral line formed by the compression of the magnetosphere. Two scenarios of near-Earth neutral line motion in the tail dynamics are also proposed. One is the formation of plural neutral lines to create a long plasmoid. The other is the oscillation of one neutral line between the near-Earth region and the mid-tail stagnant plasmoid.

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