Accession Number : ADA214400

Title :   A High Spatial Resolution Study of the Thermospheric Response to a Discrete Auroral Arc.

Descriptive Note : Final rept.,

Corporate Author : AIR FORCE GEOPHYSICS LAB HANSCOM AFB MA

Personal Author(s) : Eastes, R. W. ; Killeen, T. L. ; Carrignan, G. R. ; Hedin, A. E. ; Spencer, N. W.

Report Date : 16 FEB 1989

Pagination or Media Count : 20

Abstract : A sequence of three high latitude passes by the De-2 spacecraft has been studied using high spatial resolution data from several instruments to investigate the local thermospheric response to a discrete auroral arc. Three passes, orbits 1847, 1848, and 1849, which occurred on 6 December 1981, cross an isolated, discrete arc in the evening auroral oval. Observations of neutral winds, ion winds, neutral densities, energetic electron spectrum, and neutral temperatures were examined at a spatial resolution of approximately approx. 8 km. The observations illustrate the response of the thermosphere to the local insertion of energy and momentum and provide the basis for a more critical test of the various theoretical models that have predicted local thermospheric phenomena. The results are presented and discussed in relation to the predictions of three such local models. Keywords: Discrete aurora, Dynamics. (jhd)

Descriptors :   *AURORAE, DENSITY, DYNAMICS, ELECTRON IMPACT SPECTRA, ENERGETIC PROPERTIES, HIGH LATITUDES, IONS, THERMAL PROPERTIES, NEUTRAL, RESOLUTION, SPATIAL DISTRIBUTION, THERMOSPHERE, WIND.

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE