Solar irradiance below 120 NM and its variations

Details Solar irradiance below 120 NM and its variations Solar irradiance below 120 NM and its variations

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...74..251s&link_type=abstract

(ESA and European Physical Society, ESLAB Symposium on Physics of Solar Variations, 14th, Scheveningen, Netherlands, Sept. 16-19

Physics

4

Extreme Ultraviolet Radiation, Insolation, Solar Radiation, Solar Spectra, Variability, Atmospheric Energy Sources, Chromosphere, Solar Corona, Solar Cycles, Solar Flares, Solar Flux, Solar Terrestrial Interactions, Solar X-Rays

Scientific paper

The variability of the solar irradiance below 120 nm is so strong and so time dependent, that it must be measured directly. Data collected since 1958 on the spectral features below 120 nm show that a great variety of emission spectra and continua is generated in the chromospheric and coronal layers of the sun at plasma temperatures ranging from 8000 to 30,000,000 K. Due to technological improvements of space and laboratory instrumentation, a nearly complete set of data has been obtained since 1972. These observations exhibit strong differences in the flux variations from solar cycle 20 to 21. Data collected by the Atmospheric Explorer E over a five year period indicate that the total EUV flux increased from July 1976 to January 1979 by a factor of three. This increase relative to the solar EUV minimum is even larger, because the solar EUV flux during the rising solar cycle 21 was significantly higher than during the declining cycle 20 for similar solar conditions. The conversion of EUV energy in the upper atmosphere is difficult to describe, due to the competing solar wind and the variable heat efficiency. The need for inflight calibration of Spacelab instruments is discussed as a means of ensuring the accuracy of the EUV measurements.

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