Physics
Scientific paper
Jan 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006soph..233...89k&link_type=abstract
Solar Physics, Volume 233, Issue 1, pp.89-106
Physics
9
Scientific paper
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 νI = 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 νfm = 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.
Kislyakov Albert G.
Stepanov Alexander V.
Urpo Seppo
Zaitsev Valerii V.
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