Interpretation of hard X-ray gamma-ray and microwave burst spectra on 27 April 1981

Astronomy and Astrophysics – Astronomy

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Gamma Ray Bursts, Gamma Ray Spectra, Microwave Spectra, Solar Flares, Stochastic Processes, Time Series Analysis, X Ray Astronomy, X Ray Spectra, Coronal Loops, Distribution Functions, Electron Acceleration, Plasma Turbulence, Whistlers

Scientific paper

In this paper, we analyze the variations of microwave, X-ray, and gamma-ray burst spectra with time on 27 April 1981. By comparison between these curves of spectral indices and time profiles we find the following observational features: (1) The similar profiles consists of seven major pulses. It is shown that two sub-peaks of each pulse (only for No. 1-6 pulse) correspond each other. Besides, there are also two sub-valleys on the spectral curves of radio and X-ray bursts, but two sub-peaks of gamma-ray bursts, corresponding to two sub-peaks of time profiles. (2) During the rising phase-peak-decreasing part of each pulse for No. 1-6 pulses, the spectral indices of radio and X-ray emissions appear as soft-hard-soft and coincident between, but the variations of indices for 7 pulse of radio and gamma-ray bursts are consistent as hard-soft-hard while the indices of X-ray burst appear as soft-hard-hard. These observational features may be explained in terms of the stochastic electron acceleration in the turbulent plasma and by oscillating solution of electron equation in a pulsed injection.

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