Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.185..153s&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 185, no. 1, Nov. 1991, p. 153-164. Research supported by UGCI.
Astronomy and Astrophysics
Astrophysics
D Region, Electron-Ion Recombination, Photoionization, Recombination Coefficient, Solar Flares, Solar X-Rays, Astronomical Models, Electron Density Profiles, Magnetic Storms, Particle Precipitation
Scientific paper
Under solar flare conditions, the intensity of the solar X-rays below 10 A increases by several orders of magnitude, while the increase in intensity of H-L-alpha is small. Photo-ionization rates in the various wavelength bands in the XUV spectrum have been presented graphically as a function of altitude under quiet, M3, X4, and outstanding flare conditions to show the relative importance of solar X-rays below 10 A in the height range between 50 and 90 km. Presuming the total time constant for recombination of the ions with electrons remains constant at each altitude under different flare conditions, the effective recombination coefficient can be obtained under these conditions with a knowledge of the quiet time recombination coefficient, the production rate profiles and lambda profiles. The importance of the ratio lambda negative ions to electrons below 70 km in lowering the effective electron loss rates has been highlighted.
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