3-minute oscillations at wavelength 1.76 cm in 1992-2006

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Sun: Radio Radiation, Sun: Oscillations

Scientific paper

Context: We discuss variations of polarized radio emission using the correlation data obtained with the Nobeyama Radioheliograph at 1.76 cm wavelength. We focus on the radio 3-min oscillations. Aims: We consider the daily averaged correlation data with right and the left hand circular polarizations in order to study how the power spectrum and the basic periods of the 3-min oscillations changed during 1992-2006. Methods: We use spectral analysis to obtain the power spectrum of oscillations, excluding the solar flares. Results: It was found that oscillations with a period of about 3 min occur during all phases of the solar activity cycle when at least one sunspot is present on the solar disk, and that there is a linear correlation between the strength of the 3-min oscillations and the monthly mean of the sunspot areas. The basic period of these oscillations changes, beginning from 150-160 s to 170-180 s with the level of solar activity. Also, we found that there is a linear correlation between the basic period and the monthly mean of the sunspot areas.

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