Solar soft X-rays and solar activity |
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Authors: | Roger J Thomas Richard G Teske |
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Institution: | (1) Dept. of Astronomy and the McMath-Hulbert Observatory, The University of Michigan, Ann Arbor, Michigan;(2) Laboratory for Solar Physics, NASA/Goddard Space Flight Center, Greenbelt, Maryland;(3) Dept. of Astronomy and the McMath-Hulbert Observatory, The University of Michigan, Ann Arbor, Michigan |
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Abstract: | Flare-associated soft X-ray bursts (8–12 Å) are examined for 283 events observed by OSO-III. These bursts are shown to be predominantly thermal in nature. Their time-profiles are roughly similar to those of the associated H flares, although the X-ray burst begins about two minutes earlier, on the average. The strength of the soft X-ray burst is directly related to the area and brilliance of the flare, the age and flare-richness of the associated plage, and the general level of solar activity at the time of the burst. The peak enhancements in the soft X-ray and H emission rates during flares are of the same order of magnitude, as are the total flare energies radiated at these wavelengths. We estimate that soft X-radiation accounts for up to 10% of a flare's total electromagnetic emission.NRC/NAS Resident Research Associate. |
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