Transversely Accelerated Ions in Auroral Arcs

  1. S.-I. Akasofu and
  2. J.R. Kan
  1. D. M. Klumpar

Published Online: 26 MAR 2013

DOI: 10.1029/GM025p0122

Physics of Auroral Arc Formation

Physics of Auroral Arc Formation

How to Cite

Klumpar, D. M. (1981) Transversely Accelerated Ions in Auroral Arcs, in Physics of Auroral Arc Formation (eds S.-I. Akasofu and J.R. Kan), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM025p0122

Author Information

  1. University of Texas at Dallas, Richardson, Texas 75080

Publication History

  1. Published Online: 26 MAR 2013
  2. Published Print: 1 JAN 1981

ISBN Information

Print ISBN: 9780875900506

Online ISBN: 9781118664360

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Keywords:

  • Auroras—Addresses, essays, lectures

Summary

Ionospheric ions apparently accelerated transversely to the geomagnetic field in the topside ionosphere are regularly detected by the soft particle spectrometers on the ISIS satellites. Such gyro-accelerated ions are observed in association with precipitating auroral electrons. A detailed study of their relationship with such electrons and with field-aligned currents, together with simultaneous measurements of the local plasma composition and density, reveals the specific conditions present in the topside ionosphere during the generation of such transversely accelerated ions (TAI). A proposed mechanism for generation of TAI involving acceleration by electrostatic ion cyclotron waves is consistent with the present observations.