Atomic oxygen in the thermosphere during the July 13, 1982, solar proton event deduced from far ultraviolet images

Details Atomic oxygen in the thermosphere during the July 13, 1982, solar proton event deduced from far ultraviolet images Atomic oxygen in the thermosphere during the July 13, 1982, solar proton event deduced from far ultraviolet images

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...104.4267d&link_type=abstract

Journal of Geophysical Research, Volume 104, Issue A3, p. 4267-4278

Physics

16

Meteorology And Atmospheric Dynamics: Waves And Tides

Scientific paper

The far ultraviolet (FUV) analysis technique of Strickland et al. [this issue] is used to infer height-integrated O/N2 column densities from O I-130.4-nm FUV dayglow images taken by the Dynamics Explorer 1 (DE 1) spin scan auroral imager (SAI) [Frank et al., 1981] during a large solar proton event that occurred on July 13, 1982. The FUV results show that O/N2 decreases in the northern hemisphere as a result of seasonal and storm time effects. Furthermore, these decreases differ significantly from corresponding predictions made by the MSISE-90 model of Hedin et al. [1991]. The FUV-derived O/N2 column densities are compared to in situ volume density and neutral temperature ([O], [N2], Tn) measurements made from the Dynamics Explorer 2 (DE 2) satellite [Carignan et al., 1981; Spencer et al., 1981]. The comparisons are made using two techniques. In the first approach, ground truth estimates of O/N2 column densities are made from the in situ measurements. In the second approach, [O] volume densities are inferred from the FUV measurements of O/N2 column density and directly compared to direct DE 2 neutral atmosphere composition spectrometer (NACS) measurements of [O]. While some discrepancies exist, the results show that reasonable estimates of the atomic oxygen volume density [O] during the July 13, 1982, solar proton event could be made using the FUV images.

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