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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 | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Kaufmann, P. Correia, E. Zodivaz, A. M. Costa, J. E. R. Takakura, T. Tapping, K. F. Cliver, E. W. |
| Copyright Year | 1986 |
| Description | A solar burst was observed with high sensitivity and time resolution at cm-mm wavelengths by two different radio observatories (Itapetinga and Algonquin), with high spectral time resolution at dm-mm wavelengths by patrol instruments (Sagamore Hill), and at hard X-rays (HXM Hinotori). 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 high energy X-rays. The hardest X-ray spectrum (-3) coincided with peak radio emission at the higher frequency (44 GHz). The event appeared to be built up by a first 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 at X-rays, with predominant repetition rates ranging from 2.0 to 3.5 Hz. |
| File Size | 433828 |
| Page Count | 13 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19870012370 |
| Archival Resource Key | ark:/13960/t47q3vz1t |
| Language | English |
| Publisher Date | 1986-01-01 |
| Access Restriction | Open |
| Subject Keyword | Solar Physics Observatories Radio Astronomy Solar Flares Spectrum Analysis Millimeter Waves Spectral Emission Time Measurement X Ray Spectra Solar Radiation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
