High time resolution analysis of solar hard X-ray flares observed on board the ESRO TD-1A satellite

Details High time resolution analysis of solar hard X-ray flares observed on board the ESRO TD-1A satellite High time resolution analysis of solar hard X-ray flares observed on board the ESRO TD-1A satellite

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...48..197h&link_type=abstract

Solar Physics, vol. 48, June 1976, p. 197-254.

Physics

203

Satellite-Borne Instruments, Solar Flares, Solar X-Rays, Td Satellites, Photopeak, Satellite Observation, Spectrometers, Time Series Analysis

Scientific paper

Observations of 11 solar flare events made with the S-100 solar hard X-ray spectrometer aboard the ESRO TD-1A satellite over the period from Mar. 12, 1972, to Oct. 1, 1973, are reported and analyzed. The observations covered the energy range above 25 keV in 12 logarithmically spaced channels with time resolutions of 1.2 sec in the four low-energy channels (25-90 keV) and 4.8 sec in the others. Photon spectra are computed for each event in the framework of the thick-target model, and two phenomenological classifications are suggested: impulsive and extended X-ray bursts. It is shown that the photon spectra derived for impulsive bursts are generally compatible with a single power law while the spectra for extended bursts often soften toward higher energies, are sometimes compatible with two power laws, and often exhibit a break. Both count rates and inferred source parameters are subjected to time-series analyses, stressing the statistical properties of the count rates and their relation to time scales involved in the electron acceleration process. The possible presence of periodicities in the time profiles is investigated along with the significance of timing differences between short spike peaks at different photon energies.

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