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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
An auroral F-region study using in situ measurements by the Atmosphere Explorer-C satellite
Planetary and Space Science, Volume 23, No. 12, Year 1975
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Description
On 14 July 1974 the Atmosphere Explorer-C satellite flew through an aurora at F-region altitudes just after local midnight. The effects of the particle influx are clearly evident in the ion densities, the 6300 Å airglow, and the electron and ion temperatures. This event provided an opportunity to study the agreement between the observed ion densities and those calculated from photochemical theory using in situ measurements of such atmospheric parameters as the neutral densities and the differential electron energy spectra obtained along the satellite track. Good agreement is obtained for the ions O2+, NO+ and N2+ using photochemical theory and measured rate constants and electron impact cross sections. Atomic nitrogen densities are calculated from the observed [NO+] [O2+] ratio. In the region of most intense electron fluxes (20 erg cm-2 sec-1) at ∼280 km, the N density is found to be between 2 and 7 × 107 cm-3. The resulting N densities are found to account for approx. 60% of the production of N+ through electron impact on N and the resonant charge exchange of O+(2P) with N(4S). This reaction also provides a significant source of O(1S) in the aurora at F-region altitudes. In the region of intense fast electron influx, the reaction with atomic nitrogen is found to be the main loss of O+(2P). © 1975.
Authors & Co-Authors
Torr, Marsha R.
Unknown Affiliation
Torr, Douglas Graham
United States, Ithaca
National Astronomy and Ionosphere Center, new York
United States, Ann Arbor
University of Michigan, Ann Arbor
South Africa, Pretoria
The Council for Scientific and Industrial Research
Hoffman, R. A.
United States, Greenbelt
Nasa Goddard Space Flight Center
Hanson, W. B.
Unknown Affiliation
Hoffman, J. H.
United States, Richardson
The University of Texas at Dallas
Peterson, W. K.
United States, Baltimore
Johns Hopkins University
Walker, J. C.G.
United States, Ithaca
National Astronomy and Ionosphere Center, new York
Statistics
Citations: 13
Authors: 7
Affiliations: 6
Identifiers
Doi:
10.1016/0032-0633(75)90094-X
ISSN:
00320633