Abstract
127 hr of high-resolution Hα movies of young active regions have been compared with simultaneous 1.5–15 keV X-ray measurements from the Mapping X-Ray Heliometer experiment on OSO-8, with particular attention to preflare periods and to the possibility of X-ray emission associated with filament activity during that time. The period studied included 8 confirmed flares or subflares, 16 unreported events of comparable magnitude, and numerous examples of filament activity. We found no evidence for X-ray emission from areas of enhanced filament activity unless simultaneous brightenings were present in Hα. In addition, we detected no peculiar behavior of either filaments or X-rays during the period of approximately 20 min preceding these small flares which, even in retrospect, would have allowed them to be ‘predicted’.
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Mosher, J.M., Acton, L.W. X-rays, filament activity and flare prediction. Sol Phys 66, 105–111 (1980). https://doi.org/10.1007/BF00150522
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DOI: https://doi.org/10.1007/BF00150522