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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 20, issue 4
Ann. Geophys., 20, 445–460, 2002
https://doi.org/10.5194/angeo-20-445-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 20, 445–460, 2002
https://doi.org/10.5194/angeo-20-445-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Apr 2002

30 Apr 2002

Energetic particle observations at the subsolar magnetopause

A. A. Eccles and T. A. Fritz A. A. Eccles and T. A. Fritz
  • Boston University Center for Space Physics, Boston MA, USA
  • Correspondence to: T. A. Fritz (fritz@bu.edu)

Abstract. The pitch-angle distributions (PAD) of energetic particles are examined as the ISEE-1 satellite crosses the Earth’s magnetopause near the subsolar point. The investigation focuses on the possible existence of a particular type of distribution that would be associated with a source of energetic particles in the high-latitude magnetosphere. PADs, demonstrating broad, persistent field-aligned fluxes filling a single hemisphere (upper/northern or lower/southern), were observed just sunward of the magnetopause current layer for an extended period of many minutes. These distributions are a direct prediction of a possible source of energetic particles located in the high altitude dayside cusp and we present five examples in detail of the three-dimensional particle distributions to demonstrate their existence. From these results, other possible causes of such PADs are examined.

Key words. Magnetospheric physics (energetic particles, precipitating; magnetopause, cusp and boundary layers; magnetospheric configuration and dynamics)

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