Injun 5 low-energy plasma observations during a major magnetic storm

Details Injun 5 low-energy plasma observations during a major magnetic storm Injun 5 low-energy plasma observations during a major magnetic storm

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.3217r&link_type=abstract

Journal of Geophysical Research, vol. 83, July 1, 1978, p. 3217-3225.

Physics

Explorer 40 Satellite, Ionospheric Composition, Magnetic Storms, Plasma Probes, Red Arcs, Ring Currents, Alouette 2 Satellite, Electron Energy, Electrostatic Probes, Midlatitude Atmosphere

Scientific paper

Electron densities and temperatures as well as omnidirectional fluxes of hyperthermal positive ions were measured by means of spherical Langmuir probes aboard Injun 5 at altitudes of over 2000 km during a major geomagnetic storm. The electron density in the mid-latitude trough decreased and the temperatures increased during the early phases of the storm. As the storm progressed, the trough's position moved equatorward, plasma depletions being observed to an invariant latitude of 40 degrees during the early recovery phase. Hyperthermal ions detected in the vicinity of the trough were ring current particles reaching to the satellite's altitude. The minimum thermal electron densities in the trough were found to be within one degree of latitude of the maximum ring current flux. Maximum electron temperatures were measured several degrees equatorward of this position. Injun 5 electron temperatures are compared with those measured by Alouette 2 over the reported positions of stable auroral red arcs. The observations are also used to evaluate further a method developed by Cole (1970) for calculating the position of the ring current by using ground magnetic fluctuations.

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