Solar X-ray control of the D-region of the ionosphere

Details Solar X-ray control of the D-region of the ionosphere Solar X-ray control of the D-region of the ionosphere

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jatp...42..339s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 42, Apr. 1980, p. 339-355.

Physics

Geophysics

2

Atmospheric Ionization, D Region, Solar Activity Effects, Solar Terrestrial Interactions, Solar X-Rays, Electron Density Profiles, Geophysics, Spectral Energy Distribution

Scientific paper

The relative importance of solar X-rays in the formation of the D-region in the nonpolar latitudes is examined as a function of solar activity level expressed in terms of a daily activity index. This index is the emission temperature of the active regions occurring during the day deduced from a model (Sengupta, 1971, 1974) of the coronal active regions responsible for most of the solar X-ray emission in the less than 20 A wavelength region. The change with solar activity in the X-ray contribution to the D-region ionization is found to be due to change in the spectral distribution, and change in the less than 20 A flux. In addition, the variation in 2.44 MHz vertical incidence absorption 85 km (chi = 45 deg) is well explained by the variation in solar X-ray emission with solar activity consistent with the above-mentioned model.

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