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Published online by Cambridge University Press: 12 April 2016
Soft X-ray enhancements of solar radiation are on many occasions recorded by Solrad 9 which is instrumented with several photometers sensitive to X-ray emission in the range 2–25 keV. A non-thermal interpretation of X-ray bursts for energy larger than 10–20 keV is usually given in the literature, while for the soft X-ray region below 10 keV the common interpretation is a thermal one.