Timing analysis of hard X-ray emission and 22 GHz flux and polarization in a solar burst

Details Timing analysis of hard X-ray emission and 22 GHz flux and polarization in a solar burst Timing analysis of hard X-ray emission and 22 GHz flux and polarization in a solar burst

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...94..369c&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 94, Sept. 1984, p. 369-378. Research supported by the Financiadora de Estudos e Projetos.

Physics

9

Microwave Emission, Polarization Characteristics, Solar Radio Bursts, Solar X-Rays, Circular Polarization, Cross Correlation, Millimeter Waves, Temporal Distribution, Temporal Resolution

Scientific paper

A solar flare occurring on 26 February, 1981 at 19:32 UT was observed simultaneously in hard X-rays and microwaves with a time resolution of a fraction of a second. The authors find that: (1) all 22 GHz flux structures were delayed by 0.2 - 0.9 s relative to similar structures in hard X-rays throughout the burst duration; (2) different burst structures showed different delays, suggesting that they are independent of each other; (3) the time structures of the degree of polarization at 22 GHz precede the total microwave flux time structures by 0.1 - 0.5 s; (4) the time evolutions of time delays of microwaves with respect to hard X-rays and also the degree of microwave polarization show fluctuations which are not clearly related to any other time structures. If one takes mean values for the 32 s burst duration, one finds that hard X-ray emission precedes the degree of microwave polarization by 450 ms, which in turn precedes the total microwave flux by 110 ms.

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