Seasonal variations of tropical F-region nightglow emissions and correlative ionospheric studies

Details Seasonal variations of tropical F-region nightglow emissions and correlative ionospheric studies Seasonal variations of tropical F-region nightglow emissions and correlative ionospheric studies

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jatp...51..433s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 51, May 1989, p. 433-439.

Physics

1

Annual Variations, F Region, Ionospheric Electron Density, Nightglow, Tropical Regions, Nocturnal Variations, Remote Sensing, Solar Activity Effects

Scientific paper

Simultaneous zenith measurements of the forbidden O I 630 nm and permitted 777.4 nm nightglow emissions have been carried out at Cachoeira Paulista, Brazil, during the period February 1983 - May 1984, a period of medium solar activity. Salient features of these observations are presented and discussed. The O I 630 nm emission mean seasonal-nocturnal variations show the presence of pre- and post-midnight enhancements, with intensity levels slightly lower in the winter season. The O I 777.4 nm emission mean seasonal-nocturnal variations show a monotonic intensity decrease in time, with very low intensity levels during the winter season. A comparison has been made between the F-region peak electron densities, and heights determined from the optical and ionosonde remote sensing methods. In general, a good correlation is found between the measured and the nightglow inferred ionospheric parameters. The observed airglow intensity variations are also compared with those predicted by a semiempirical low latitude ionospheric model.

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