Abstract
AN unusually large solar flare, of intensity 3+, was observed at Mount Wilson on July 16, 1959. The flare was in an active region centered on the spot group at approximately 18° N., 29° W. It showed a predominantly S-shaped or double spiral configuration, with marked variations of relative intensity in its various parts. Visual observations of the spectrum showed that the flare commenced abruptly between 21.19 and 21.24 U.T.; maximum was between 22.01 and 22.13 U.T. Lines of Ca II, Na, He and H were observed to be in emission for more than 1 hr.; the width of the Hα emission was greater than 6 A. Emission persisted in the lines of Ca II and of H until after observations were terminated at 01.00 U.T. on July 17.
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Babcock, H. W., Astrophys. J., 118, 387 (1953).
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HOWARD, R., CRAGG, T. & BABCOCK, H. Magnetic Field Associated with a Great Solar Flare. Nature 184, 351 (1959). https://doi.org/10.1038/184351a0
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DOI: https://doi.org/10.1038/184351a0
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