A series of daytime Lyman-alpha extinction measurements at middle-latitude

Details A series of daytime Lyman-alpha extinction measurements at middle-latitude A series of daytime Lyman-alpha extinction measurements at middle-latitude

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jatp...42..307w&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 42, Apr. 1980, p. 307-315.

Physics

Absorption Cross Sections, Annual Variations, D Region, Lyman Alpha Radiation, Molecular Absorption, Oxygen, Atmospheric Ionization, Ionospheric Currents, Mesopause, Temperature Profiles, Thermosphere

Scientific paper

The background to a series of daytime Lyman-alpha extinction measurements is presented and it is concluded that the absorption cross-sections for molecular oxygen measured by Carver et al. (1976) are the most appropriate to D-region calculations. Using these cross-sections pressure profiles are derived which agree with the CIRA 1972 reference atmosphere and exhibit the expected seasonal variations. Temperature estimates derived from the present profiles also exhibit agreement with model atmospheres except that anomalously high lower thermospheric temperatures are measured in winter. The molecular oxygen concentrations measured exhibit a seasonal variation which is strongly dependent upon latitude or location and the extent of which may vary with the solar cycle. The seasonal average of the molecular oxygen measurements is in good agreement with the model atmosphere below the mesopause but departs significantly above the mesopause, measured concentrations being higher.

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