Irradiation solar flux measurements between 120 and 400 nm - Current position and future needs

Details Irradiation solar flux measurements between 120 and 400 nm - Current position and future needs Irradiation solar flux measurements between 120 and 400 nm - Current position and future needs

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978p%26ss...26..355s&link_type=abstract

(COSPAR, Meeting, 20th, Tel Aviv, Israel, June 7-18, 1977.) Planetary and Space Science, vol. 26, Apr. 1978, p. 355-365.

Physics

5

Aeronomy, Atmospheric Chemistry, Photochemical Reactions, Solar Flux, Ultraviolet Radiation, Radiation Distribution, Stratosphere, Sunspots, Troposphere, Upper Atmosphere

Scientific paper

Solar variability is considered inadequate to explain discrepancies among various data on irradiation solar fluxes between 120 and 400 nm. The 120-175, the 175-240, and the 240-400 nm wavelength intervals are evaluated separately. It is noted that molecular oxygen in the lower thermosphere accounts for most of the absorption of wavelengths in the first interval, except for the solar Lyman alpha emission line (which penetrates into the mesosphere and leads to the formation of the ionospheric D region). Second interval wavelengths are responsible for the photodissociation of molecular oxygen below 90 km, and the third interval is a source of energy for photodissociation processes in the stratosphere and troposphere. Three sources of error in the field of UV spectroradiometry are listed, including the uncertainty of available radiometric primary and transfer standards, instrument miscalibration, and errors resulting from the solar measurements themselves. Caution is advised in the interpretation of the data.

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