Abstract
A hard solar X-ray burst in the energy range 90–400 keV was observed at about 0528:30 UT on 13 April 1974. This event is peculiar in the sense that the X-ray flux is considerably high whereas the corresponding radio and optical flares are of moderate sizes, that the duration of the X-ray burst is very short, and that the X-ray peak is delayed by about 2.5 min relative to the first radio peak.
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Fukada, Y., Hayakawa, S., Kasahara, I. et al. An impulsive solar X-ray burst in the energy range 90–400 keV. Sol Phys 42, 441–444 (1975). https://doi.org/10.1007/BF00149924
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DOI: https://doi.org/10.1007/BF00149924