Post-sunset wintertime 630.0 nm airglow perturbations associated with gravity waves at low latitudes in the South American sector

Details Post-sunset wintertime 630.0 nm airglow perturbations associated with gravity waves at low latitudes in the South American sector Post-sunset wintertime 630.0 nm airglow perturbations associated with gravity waves at low latitudes in the South American sector

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59.1611s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, v. 59, p. 1611-1623.

Physics

10

Scientific paper

We report photometric southern hemisphere wintertime perturbations of the nocturnal F-region atomic oxygen 630 nm red line intensity which are observed to occur concurrently with apparent ionogram signatures of F-region gravity waves. Such airglow events were detected on a total of 40 days of experiments. The airglow experiments were run at Cachoeira Paulista (CP, geographic 22° 41' S, 45° 00' W, dip 28° S). The events are characterized by south-to-north travelling airglow valleys, or depletion events (SNE). They were obtained from a set of 299 experiments performed during the period of 10 August 1977 to 4 July 1984. Their equatorwards velocities, wavelengths and periods vary within the ranges of 150-300 m s-1, 100-200 km and 15 min - 3 h, respectively. They appear during the post-sunset period and remain within the field of view of the meridional scanning photometer from about ten minutes to a few hours. The SNE were seen to occur more frequently in July and were absent from September to March. The photometer scanned +/- 75° around zenith in the magnetic meridional and zonal planes. Ionogram spread-F and VHF polarimeter data that showed no phase or amplitude scintillations during the SNE indicated no concurrent existence of equatorial plasma depletions. It is shown that the SNE are not necessarily related to geomagnetic disturbed conditions. The present results are, to the authors' knowledge, the first showing gravity wave effects, near the sunset side of the solar terminator, on the low-latitude F-region atomic oxygen and nightglow under undisturbed geomagnetic conditions. The characteristics of these waves point to the solar terminator as their source of generation. A series of physical and morphological features of the phenomena are presented.

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