Abstract
An analytical study of the D-region response to solar flare X rays is presented. A basic formalism is improvised and developed to determine the ionization and absorption characteristics of the D region. This formalism is subsequently utilized to study the effects of solar flare X-ray spectra monitored by Ariel satellite during April–May 1962. Calculated values of electron number density and excess absorption are compared with available experimental data. Only the buildup phase of the disturbance is studied since no information is available on the decay phase of X-ray flares. The decay phase is discussed hypothetically in a few cases. More recent data on solar flare X rays can be analyzed in an identical fashion. It is also shown that an electron-ion recombination coefficient of 1–3 × 10−7 (400/T)1/2 cm³ sec−1 results in realistic estimates of ionospheric effects.
Published Version
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