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Paper: Radio Seismology Aspects of the Solar 3-Minute Oscillations at Wavelength 1.76 cm in 1992-2007
Volume: 405, Solar Polarization 5: In Honor of Jan Olof Stenflo
Page: 449
Authors: Tlatov, A.G.; Riehokainen, A.
Abstract: In this paper we discuss variations of polarized radio emission from the Sun at wavelength 1.76 cm using data obtained with the Nobeyama Radioheliograph (NoRH).We concentrate on the properties of the 3-minute radio oscillations. We use the daily averaged correlation data with the right and the left hand circular polarizations in order to study how the power spectrum and the basic period of the 3-minute oscillations change during 1992-2007. These data have a second time resolution. We use the spectral analysis in order to obtain the power spectrum of the 3-minute oscillations, excluding the solar flares for this study. It was found that oscillations with a period of about 3 minutes occur during all phases of the solar activity cycle, when at least one sunspot is present at the solar disk. There is a linear correlation between the strength of the 3- minute oscillations and the monthly mean of the sunspot areas. Basic period of the 3-minute oscillations changes with the level of solar activity.
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