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Rapid spectral and flux time variations in a solar burst observed at various dm-mm wavelengths and at hard X-rays
| Content Provider | Semantic Scholar |
|---|---|
| Author | Zodivaz, A. M. Kaufmann, Pierre Correia, Emília Costa, Joaquim E. R. Takakura, Toshihiko Cliver, Edward W. Tapping, K. F. |
| Copyright Year | 1986 |
| Abstract | A solar burst was observed with high sensitivity and time resolution at cm-mm wavelengths by two different radio observatories with high spectral time resolution at dm-cm wavelengths by patrol instruments and at hard x rays. At the onset of the major burst time structure, there was a rapid rise in the spectral turnover frequency (from 5 to 15 GHz), in about 10s, coincident to a reduction of the spectral index in the optically thin part of the spectrum. The burst maxima were not time coincident at the optically thin radio frequencies and at the different hard x ray energy ranges. The profiles at higher radio frequencies exhibited better time coincidence to the higher-energy x rays. The hardest x ray spectrum (-3) coincided to peak radio emission at the higher frequency (44 GHz). The event appears to build up first by a major injection of softer particles followed by other injections of harder particles. Ultrafast time structures were identified as superimposed on the burst emission at the cm-mm high-sensitivity data and at x rays, with predominant repetition rates ranging 2.0-3.5 Hz. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19870012370.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
