Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64.1273w&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 8-11, p. 1273-1286.
Physics
10
Scientific paper
Longitudinal variations in green line airglow are investigated. The volume emission rate data used for the analysis are taken by Wind-Imaging Interferometer (WINDII) at latitudes 70°S-70°N and altitudes 90-120km in December/January and March/April of 1991-1996. Relatively stable or stationary patterns, which persist from year to year, are found to exist at fixed local times during solstice and equinox. In general, the nightglow exhibits zonal wavenumber one and two variations in the southern and northern latitudes around 35°, respectively. The dayglow displays a wavenumber two variation near the equator, with a tendency towards 10°S-20°S for the solstitial period. All structures are seen to extend over 10° or more of latitude. The emission rates vary significantly, changing by a factor 2 or more at the minima and maxima of the wave structures. Primary maxima are around ~180°E-240°E for the nightglow, and ~300°E-360°E for the dayglow, while secondary maxima are near ~90°-120°E for both airglows. Their magnitudes also show systematic decrease by a factor of 3 from year 1991 to 1996, perhaps due to decreases in solar activity and tidal amplitude. The existence of a stationary planetary wave structure suggests the importance of coupling processes between the mesopause and the earth (or lower atmosphere) in understanding the airglow variations, in addition to the well-known solar-driven photochemistry.
Shepherd Gordon G.
Solheim Brian H.
Wang Ding Yi
Ward William E.
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