Physics
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.1933h&link_type=abstract
Journal of Geophysical Research, vol. 84, May 1, 1979, p. 1933-1938.
Physics
9
Aeronomy, Atmospheric Attenuation, Far Ultraviolet Radiation, Solar Cycles, Solar Radiation, Thermosphere, Atmospheric Models, Explorer 55 Satellite, Irradiance, Satellite Observation, Solar Physics, Ultraviolet Spectrometers
Scientific paper
The results of AE-C and AE-E satellite observations of solar EUV irradiance and atmospheric absorption at wavelengths from 140 to 1850 A, which reflect unexpectedly large differences between the past solar cycle (20) and the present one (21), are discussed. While observations of the oxygen-dissociating solar UV flux above 1230 A show at most a 10% change between the two periods, the EUV minimum at other wavelengths was found to occur 14 months before the sunspot minimum, with a magnitude considerably greater in cycle 21 than in developing cycle 20. During the period of cycle transition, observed irradiance values did not correlate with conventional activity indices. Measurements of UV attenuation reveal no increase of optical depths around 300 km, indicating no corresponding rises in atmospheric density or temperature. The results are considered to present a major challenge to aeronomical models.
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