Diagnostic for Source of a Complex Solar Burst Observed with High Spectral Resolution in Microwaves and Hard X-Rays

Details Diagnostic for Source of a Complex Solar Burst Observed with High Spectral Resolution in Microwaves and Hard X-Rays Diagnostic for Source of a Complex Solar Burst Observed with High Spectral Resolution in Microwaves and Hard X-Rays

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996plas.work..117c&link_type=abstract

Proceedings of the Fourth Brazilian Meeting on Plasma Physics and the Sixth Brazilian Plasma Astrophysics Workshop, p. 117

Physics

Plasma Physics

Solar Activity, Solar Maximum Mission, Microwave Spectra, Microwave Frequencies, Magnetic Fields, X Rays, Solar Activity Effects, X Ray Spectrometers, Spectral Resolution, Radiometers, Interferometers, Bremsstrahlung

Scientific paper

A complex solar burst have been observed with a Variable Frequency Radiometer (VFR) operating with high time (1,2 s) and frequency (1 GHz) resolution, in the frequency range 18-23 GHz simultaneously with Frequency Agile Interferometer (1-18 GHz) and with the Hard X-ray Burst Spectrometer (52-863 keV) on board Solar Maximum Mission (SMM) satellite. Time behavior of the peak frequency (fpeak) of microwave spectrum shows a remarkable constancy during all the impulsive phase of this burst, while temporal evolution of the spectral index (alpha) in the optically thin part of microwave spectrum shows a typical hard-soft-hard behavior for each time structure. Assuming a gyrosynchrotron emission mechanism in microwaves from a non-thermal population of electrons and a bremsstrahlung emission in the thick-target model hard X-ray source, the physical parameters of the microwave/hard X-ray source have been estimated such as density (Ne), magnetic field (B), effective temperature (Teff), total number (NT) and total energy (ET) for energetic electrons in the source.

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