The role of ring current O(+) in the formation of stable auroral red arcs

Details The role of ring current O(+) in the formation of stable auroral red arcs The role of ring current O(+) in the formation of stable auroral red arcs

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.7487k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, July 1, 1987, p. 7487-7502.

Physics

77

Auroral Arcs, Oxygen Ions, Red Arcs, Ring Currents, Atmospheric Models, Dynamics Explorer Satellites, Electromagnetic Interactions, Energy Sources, F Region, Heavy Ions

Scientific paper

Observations of thermal and energetic ion populations by the Dynamics Explorer 1 satellite in the magnetospheric energy source region as well as nearly simultaneous Langmuir probe measurements of enhanced electron temperatures by Dynamics Explorer 2 within the stable auroral red (SAR) arc at F region heights are used to examine the role of heavy ions in the formation of SAR arcs. It is found that sufficient energy is transferred to the electron gas at high altitudes via Coulomb collisions between the observed ring current ions and thermal electrons to support the enhanced F region electron temperatures measured on these field lines. The latitudinal variation in the electron heating rates calculated using observed ion populations is consistent with the observed variation in electron temperature across the SAR arc. In all cases, ring current O(+) is the major source of energy for the SAR arcs.

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