Abstract
It was found that in the spectrum of the white-light flare on 11 October, 1974, at the time of continuum maximum, the intensity of K1 in the Caii K line increased very significantly and reached nearly half of the continuum intensity. The duration of this unusual increase is less than 4 min. It seems that existing semi-empirical models can reproduce neither this characteristic nor the chromospheric condensation.
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Fang, C., Yin, S.Y., Hiei, E. et al. An unusual behaviour of the white-light flare on 11 October, 1974. Sol Phys 158, 387–390 (1995). https://doi.org/10.1007/BF00795672
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DOI: https://doi.org/10.1007/BF00795672