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Microwave and hard X-Ray observations of a solar flare with a time resolution better than 100 ms |
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| Authors: | P Kaufmann F M Strauss J E R Costa B R Dennis A Kiplinger K J Frost L E Orwig |
| Institution: | 1. INPE: Instituto de Pesquisas Espaciais, CNPq, C.P. 515, 12200, S?o José dos Campos, SP, Brazil 2. Laboratory of Astronomy and Solar Physics, Solar Activity Branch, NASA-Goddard Space Flight Center, 20771, Greenbelt, MD, U.S.A. 3. Applied Research Corporation, U.S.A. |
| Abstract: | Simultaneous microwave and X-ray observations are presented for a solar flare detected on May 8, 1980 starting at 19:37 UT. The X-ray observations were made with the Hard X-Ray Burst Spectrometer on the Solar Maximum Mission and covered the energy range from 28–490 keV with a time resolution of 10 ms. The microwave observations were made with the 5 and 45 foot antennas at the Itapetinga Radio Observatory at frequencies of 7 and 22 GHz, with time resolutions of 100 ms and 1 ms, respectively. Detailed correlation analysis of the different time profiles of the event show that the major impulsive peaks in the X-ray flux preceded the corresponding microwave peaks at 22 GHz by about 240 ms. For this particular burst the 22 GHz peaks preceded the 7 GHz by about 1.5 s. Observed delays of the microwave peaks are too large for a simple electron beam model but they can be reconciled with the speeds of shock waves in a thermal model. |
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