Physics
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979stp.....2..599s&link_type=abstract
In NASA. Marshall Space Flight Center Solar-Terrest. Predictions Proc., Vol. 2 p 599-616 (SEE N80-24678 15-42)
Physics
1
D Region, Ion Production Rates, Cosmic Rays, Magnetic Storms, Solar Flares, Solar X-Rays, Ultraviolet Radiation
Scientific paper
Ionization processes for the D region are reviewed. Levels of ionization range from the fairly steady rates produced through galactic cosmic rays to the large rates generated during solar flares and associated geomagnetic storms. The normal quiescent daytime D region is ionized by solar UV radiation available because of certain windows and solar X-rays, although this later source is generally weak. Cosmic rays are important roughly below 65 km. At night, stellar X-ray sources may be important along with precipitating electrons at high latitudes from the quiet magnetosphere. Solar flares can result in ionization rates due to X-rays, electrons, or nuclei which are greatly enhanced over quiet conditions. Typical ionization production rates from these various sources are illustrated.
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