On the Possible Connection between Photospheric 5-Min Oscillation and Solar Flare Microwave Emission

Dynamic spectra of low-frequency modulation of microwave emission from solar flares are obtained. Data of 15 bursts observed in 1989-2000 with Metsähovi radio telescope at 37 GHz have been used. During 13 bursts a 5-min modulation of the microwave emission intensity was detected with the frequency o...

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Bibliographic Details
Published in:Solar physics 2006-01, Vol.233 (1), p.89-106
Main Authors: Kislyakov, A G, Zaitsev, V V, Stepanov, A V, Urpo, S
Format: Article
Language:English
Subjects:
Astronomy
Emissions
Solar flares
Solar physics
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Summary:Dynamic spectra of low-frequency modulation of microwave emission from solar flares are obtained. Data of 15 bursts observed in 1989-2000 with Metsähovi radio telescope at 37 GHz have been used. During 13 bursts a 5-min modulation of the microwave emission intensity was detected with the frequency of ν^sub I^ = 3.2± 0.24 (1σ) mHz. Five bursts revealed a 5-min wave superimposed on a 1 Hz, linear frequency modulated signal generated, presumably, by coronal magnetic loop, this wave frequency is ν^sub fm^ = 3.38± 0.37 (1σ) mHz. Both intensity and frequency modulations detected are in good agreement with the data on 5-min global oscillations of photosphere and with the data on the umbral velocity oscillations observed in the vicinity of sunspots. Possible role of p-mode photospheric oscillations in modulation of microwave burst emission is discussed.[PUBLICATION ABSTRACT]
ISSN:0038-0938
1573-093X
DOI:10.1007/s11207-006-2850-y