Pulsations of microwave flaring emission at low and high frequencies |
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Authors: | V E Reznikova V F Melnikov Y Su G Huang |
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Institution: | (1) Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China;(2) Radiophysical Research Institute (NIRFI), Nizhnyi Novgorod, Russia |
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Abstract: | A wavelet analysis of the flare-intensity variations has been carried out for a solar flare observed with the Nobeyama Radioheliograph
at 17 and 34 GHz and the spectrometer of Purple Mountain Observatory at 4.5–7.5 GHz. The signals contain a well-pronounced
periodicity with a period of P = 14–17 s and stable, coherent behavior at frequencies higher and lower than the peak frequency. We simulated the modulation
of the gyrosynchrotron emission by fast sausage magnetoacoustic oscillations for the cases of low and high plasma density
in the radio source. The synchronism of the pulsations at high and low frequencies can be realized only in the case of high
plasma density, when the low-frequency turnover of the microwave spectrum is due to the Razin effect, not self-absorption.
Published in Russian in Astronomicheskiĭ Zhurnal, 2007, Vol. 84, No. 7, pp. 655–664.
The article was translated by the authors. |
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