Repetition rates of fast pulses in a solar burst observed at mm-waves and hard X-rays

Physics

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Solar Flares, Solar Oscillations, Solar Radio Bursts, Solar X-Rays, Power Spectra, Spectral Energy Distribution, Temporal Resolution

Scientific paper

The solar burst of May 21, 1984, 13:26 UT, showed radio spectral emission with a turnover frequency above 90 GHz, well correlated in time with the hard X-ray emission. It consisted of seven major time structures (1-3 s in duration), of which each was composed of several fast pulses with rise times between 30 and 60 ms. The spectral indices of the millimeter and hard X-ray emission exhibited sudden changes during each major time structure. The subsecond pulses were nearly in phase at 30 and 90 GHz, but their relative amplitude at 90 GHz (about 50 percent) were considerably larger than at 30 GHz (less than 5 percent). It was also found that the 90 GHz and the 100 keV X-rays fluxes were proportional to the repetition rate of the subsecond pulses, and that the hard X-ray power law index hardens with increasing repetition rate.

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