Physics
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15...92b&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 15, Jan. 1988, p. 92-94.
Physics
65
Atmospheric Models, Equatorial Regions, Nitric Oxide, Solar Terrestrial Interactions, Thermosphere, Atmospheric Composition, E Region, Earth Atmosphere, Lyman Alpha Radiation, Photochemical Reactions, Solar Mesosphere Explorer
Scientific paper
As measured by the Solar Mesosphere Explorer satellite, the density of nitric oxide at low latitudes (30 deg S to 30 deg N) and at 110 km (E-region) decreased from a mean value of 3 x 10 to the 7th molecules/cu cm in January 1982 to a mean value of 4 x 10 to the 6th molecules/cu cm in April 1985. In addition, the nitric oxide density varied + or - 50 percent with a 27-day period during times of high solar activity. The variation of nitric oxide correlates with variations in the solar Lyman-alpha irradiance which is also measured by the Solar Mesosphere Explorer satellite. The Lyman alpha irradiance is interpreted as an index of the variations in the solar EUV and soft X-ray flux. The hypothesis is proposed that the solar X-ray flux between 20 and 100 A has a larger variation than the solar EUV flux between 100 and 1050 A, and that the solar X-rays produce photoelectrons which are the source of the nitric oxide.
Barth Charles A.
Cleary David D.
Kent Tobiska W.
Siskind David E.
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