Characteristic features of electron temperature and density variations in field-aligned current regions

Details Characteristic features of electron temperature and density variations in field-aligned current regions Characteristic features of electron temperature and density variations in field-aligned current regions

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9811257a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A7, p. 11,257-11,266.

Computer Science

Sound

11

Electron Energy, Field Aligned Currents, Ionospheric Electron Density, Ionospheric Sounding, Satellite-Borne Instruments, Geomagnetism, Satellite Sounding, Statistical Analysis

Scientific paper

Observations by the thermal electron energy distribution (TED) instrument on board the Akebono (EXOS-D) satellite show that variations in electron temperatures, at altitudes from 300 to 2300 km, are closely related to field-aligned current (FAC) structures. At higher altitudes, electron temperatures increase in upward FAC regions and decrease in regions of downward FAC, while at the lower altitudes only temperature increases in upward FAC and adjacent regions are observed. Electron temperature variations were also found to be related to the number density of ambient electrons and the field-aligned current density. A numerical simulation is carried out to examine energetic particle precipitation and Joule dissipation as a possible mechanism for the observed temperature variations using the electron energy equation. We focus the simulations on the temperature increase. Thermal electrons are found to be efficiently heated by Joule dissipation at lower altitudes; however, for increasing altitudes, energetic particle precipitation becomes the major heating source.

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