Abstract
The time structure and intensity of OSO-6 observations of EUV bursts were studied in relation to the corresponding 10–1030 Å enhancements deduced from SFD data. Impulsive EUV emissions from lines normally emitted from either the chromosphere or from the chromosphere-corona transition region rise simultaneously with the 10–1030 Å flash, to within the time resolution of the OSO-6 observations. Mg × 625 Å also showed concurrent impulsive emissions and a close intensity relation to the 10–1030 Å enhancement. The observational results are consistent with the hypothesis that most of the EUV radiation is being produced thermally in a region of chromospheric density, which is being heated by collisional losses of nonthermal electrons.
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Donnelly, R.F., Wood, A.T. & Noyes, R.W. The extreme ultraviolet emissions of solar flares: A comparison between OSO-6 spectroheliograph observations and SFDs. Sol Phys 29, 107–123 (1973). https://doi.org/10.1007/BF00153443
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DOI: https://doi.org/10.1007/BF00153443