An experimental investigation of thermospheric structure near an auroral arc

Details An experimental investigation of thermospheric structure near an auroral arc An experimental investigation of thermospheric structure near an auroral arc

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9710539e&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A7, July 1, 1992, p. 10,539-10,549.

Physics

12

Atmospheric Models, Auroral Arcs, Dynamics Explorer 2 Satellite, Electronic Spectra, Thermosphere, Dynamic Models, High Resolution, Neutral Atmospheres, Nitrogen, Oxygen, Plasma Density

Scientific paper

The paper compares observations of thermospheric parameters, made from DE-2 spacecraft during three successive orbital crossings of a quiescent dusk sector auroral arc, with the predictions of three fine-grid auroral arc models. DE-2 measured the ion and neutral window, electron and neutral temperatures, neutral composition, and energetic auroral electron spectra (5 eV to 32 keV) at about 320 km altitude. The DE-2 composition measurements showed a local increase of the N2/O ratio in the arc, which is interpreted to be a result of the upward motion of N2-rich air. A reduction in the measured neutral temperature of about 100 K in the arc, relative to temperatures on either side, was found for all three arc crossings. Of the three theoretical models examined, only one shows a tendency for the neutral thermospheric temperature to drop in the auroral arc, and the decrease is significantly less than the observed temperature change.

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