Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.185..153b&link_type=abstract
Astrophysics and Space Science, Volume 185, Issue 1, pp.153-164
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
Under solar flare conditions, the intensity of the solar X-rays below 10 Å increases by several orders of magnitude, while the increase in intensity of H-Lα is small. Photo-ionization rates in the various wavelength bands in theXUV 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 Å 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, one can obtain the effective recombination coefficient ψeff under these conditions with a knowledge of the quiet time recombination coefficient, the production rate profiles and λ profiles. The importance of the ratio λ of negative ions to electrons below 70 km in lowering the effective electron loss rates has been highlighted.
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