Near-earth ultraviolet environment

Details Near-earth ultraviolet environment Near-earth ultraviolet environment

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981spie..279..216w&link_type=abstract

In: Ultraviolet and vacuum ultraviolet systems; Proceedings of the Meeting, Washington, DC, April 21, 22, 1981. (A83-13954 03-35

Astronomy and Astrophysics

Astronomy

Exosphere, Far Ultraviolet Radiation, Geocoronal Emissions, Terrestrial Radiation, Ultraviolet Astronomy, Extraterrestrial Radiation, Helium, Solar Position, Space Plasmas

Scientific paper

The geocoronal UV background, the geophysical zone emission, and the extraterrestrial background are discussed. The derivation of the distribution of hydrogen around the earth from a photograph of the earth's emissions in the 1050-1600 A spectral range is described, as is the derivation of the density distribution of helium from photometric observations. The nadir intensities decrease to undetectable levels moving into the night, but the zenith intensities settle to a five Rayleigh value at night. This is conclusive evidence for a five Rayleigh value at night. This is conclusive evidence for extraterrestrial helium emission. For 304 A radiation, the intensity decreases from a maximum in the daytime near the magnetic equator toward both poles, dropping sharply near 55 degrees magnetic latitude and reappearing at that latitude. Collisional excitation processes that contribute to terrestrial UV are also discussed. The inflow and focusing of the local interstellar medium (LISM) in the solar system is described, and derived values for LISM velocity and temperature are shown.

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