Acceleration of Energetic Oxygen (E> 137 KEV) in the Storm-Time Ring Current

  1. Tom Chang,
  2. M. K. Hudson,
  3. J. R. Jasperse,
  4. R. G. Johnson,
  5. P. M. Kintner and
  6. M. Schulz
  1. A. T. Y. Lui,
  2. R. W. McEntire,
  3. S. M. Krimigis and
  4. E. P. Keath

Published Online: 21 MAR 2013

DOI: 10.1029/GM038p0149

Ion Acceleration in the Magnetosphere and Ionosphere

Ion Acceleration in the Magnetosphere and Ionosphere

How to Cite

Lui, A. T. Y., McEntire, R. W., Krimigis, S. M. and Keath, E. P. (1986) Acceleration of Energetic Oxygen (E> 137 KEV) in the Storm-Time Ring Current, in Ion Acceleration in the Magnetosphere and Ionosphere (eds T. Chang, M. K. Hudson, J. R. Jasperse, R. G. Johnson, P. M. Kintner and M. Schulz), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM038p0149

Author Information

  1. The Johns Hopkins University, Applied Physics Laboratory, Laurel, Maryland 20707

Publication History

  1. Published Online: 21 MAR 2013
  2. Published Print: 1 JAN 1986

ISBN Information

Print ISBN: 9780875900636

Online ISBN: 9781118664216

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Keywords:

  • Magnetosphere—Congresses;
  • Ionosphere—Congresses;
  • Ion flow dynamics—Congresses;
  • Space plasmas—Congresses

Summary

Acceleration of energetic oxygen (E > 137 keV) in the storm-time ring current region during the geomagnetic storm of September 4–7, 1985 is investigated with measurements from the Medium Energy Particle Analyzer (MEPA) on the Charge Composition Explorer (CCE). Large intensity increases of oxygen ions, up to a factor of 2 × 103, were seen at L ≈2.5 to 7.0 during the main phase of the geomagnetic storm. Analysis shows that the intensity enhancement of the locally mirroring oxygen ions at L ≈3.5 to 5.5 is more than expected from betatron acceleration of the prestorm local population. However, an inward radial displacement by approximately 1.5 R e of the pre-storm energetic oxygen population accompanied by betatron acceleration can account for the intensity increase at this L range. The result also indicates a new finding that an additional oxygen ion source or acceleration mechanism exists at L ≈6.5 to 8.