The development and flaring of an active region exhibiting unusual magnetic structure |
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| Authors: | Peter Foukal |
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| Institution: | (1) Big Bear Solar Observatory, Hale Observatories, Carnegie Institution of Washington, Washington D.C., U.S.A.;(2) California Institute of Technology, Pasadena, Calif., U.S.A. |
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| Abstract: | The one-day development of a young bright region with loops (BRL) led to the 1N flare of 00:35 UT, 25 April, 1968.The development of the active region is followed over the two previous rotations, and the peculiar polarity of the BRL, in which neither polarity is clearly leading, is explained from its location on the boundary of two large older active regions. It is likely that the flare occurred as a result of the relaxation of the unusual polarity in the BRL.The prominent active region filament is shown to have formed from the connection of two filaments previously existing in the older AR's.From the lack of meter wave radio emission it is concluded that a very closed field configuration exists in the AR. This is supported by observation of surges contained by the magnetic field, traveling at between 110 and 190 km sec–1.The X-ray emission measure is derived and suggests that the X-ray emission volume is considerably smaller than that emitting H .Comparison of the microwave and X-ray temperatures poses the problem of why the thermal free-free emission in microwaves is so weak from such a strong thermal bremsstrahlung X-ray source. |
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