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

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984stin...8426551c&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Microwaves, Signal Processing, Solar Flares, X Ray Analysis, X Ray Astronomy, Algorithms, Cross Correlation, Data Reduction, Polarization (Waves), Time Series Analysis, Wave Propagation

Scientific paper

A solar flare occurring on 26 February 1981 at 1932 UT was observed simultaneously in hard X rays and microwaves with a time resolution of a fraction of a second. The X ray observations were made with the Hard X ray Monitor on Hinotori, and the microwave observations were made at 22 GHz with the 13.7m Itapetinga mm-wave antenna. Timing accuracy was restricted to 62.5 ms, the best time resolution obtained in hard X rays for this burst. The principal results are the following: (1) all 22 GHz flux structures were delayed by 0.2 to 0.9 second 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 to 0.5 sec; (4) plots of time delays against time obtained every 125 ms for microwaves relative to hard X rays, and for microwave polarization degree relative to total microwave flux show fluctuations which are not clearly correlated to any of the other time structures.

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