Multiple electron populations accelerated in solar bursts

Details Multiple electron populations accelerated in solar bursts Multiple electron populations accelerated in solar bursts

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phdt.........2v&link_type=abstract

Ph.D. Thesis Instituto de Pesquisas Espaciais, Sao Jose dos Campos (Brazil).

Computer Science

Populations, Solar Radio Bursts, Sun, X Ray Spectra, High Resolution, Microwave Frequencies, Observatories, Temporal Resolution, X Rays

Scientific paper

The solar burst of November 4, 1981, 1828 UT, was observed simultaneously at eight microwave frequencies (1.4-44 GHz) by the Sagamore Hill (AFGL), Algonquin (HIA) and Itapetinga (INPE) observatories, as well as at seven x-ray energy channels by the experiment on board of Hinotori satellite (28-375 keV). The radio spectra obtained at Sagamore Hill observatory (1.4-15.4 GHz) were processed with good time resolution (one spectrum/sec). Data from Algonquin (10.6 GHz) and Itapetinga (22 and 44 GHz) observatories are of high sensitivity and time resolution (limited to 30 ms in this study). The time profiles at x-rays are analyzed in the lowest energy channel (28-38 keV), with time resolution of 30 ms. X-ray spectra were also obtained every 5-10 s throughout the main face of the burst. This event received a diagnostics exceptionally complete, being particularly suitable for analysis with the objective to investigate the causes producing the observed spectral and time variations. It has been found that the commonly adopted assumption of a single homogeneous emitting source, with a single accelerated electron population, is not consistent with the data obtained at the various frequencies. The results indicate that the emission should have originated from more than one accelerated electron population in sources more complex than usually assumed. The results also show that for the unique determination of the emission components it is necessary that a more complete diagnostics, still unavailable so far, particularly on the spatial dynamic processes, which are likely to occur simultaneously, be performed.

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