Microwave and hard X-Ray observations of a solar flare with a time resolution better than 100 ms

✍ Scribed by P. Kaufmann; F. M. Strauss; J. E. R. Costa; B. R. Dennis; A. Kiplinger; K. J. Frost; L. E. Orwig

• Publisher: Springer
• Year: 1983
• Tongue: English
• Weight: 509 KB
• Volume: 84
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00157464

✦ Synopsis

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. * In memoriam .