Ionospheric effects of solar flares. II. The flare spectrum below 10 Å deduced from satellite observations

Deshpande, S. D. ; Mitra, A. P. (1972) Ionospheric effects of solar flares. II. The flare spectrum below 10 Å deduced from satellite observations Journal of Atmospheric and Terrestrial Physics, 34 (2). pp. 229-242. ISSN 0021-9169

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002191...

Related URL: http://dx.doi.org/10.1016/0021-9169(72)90166-3

Abstract

The spectral distribution and its time development for X-rays below 10 Å during solar flares are deduced from the measurements of integrated flux levels by satellite-borne detectors in the 0.5–3 Å and 1–8 Å bands. An exponential distribution and a power law distribution are considered, as well as a composite spectrum with two different electron temperatures in the bands 0.5-3 Å and 3–8 Å. Analysis of X-ray response for selected flare events gave spectral temperatures of about (1-3)×107°K for λ < 3 Å and about (8–10)×106°K for λ > 3 Å. The power law representation gave a distribution of λm, with m having values between 1–2 at the peak of the flare. Gradual changes in spectral temperatures are shown for some events.

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