The statistical study of quasi-periodic oscillations of the radio emission in solar quiet regions

Details The statistical study of quasi-periodic oscillations of the radio emission in solar quiet regions The statistical study of quasi-periodic oscillations of the radio emission in solar quiet regions

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012an....333...20k&link_type=abstract

Astronomische Nachrichten, Vol.333, Issue 1, p.20

Astronomy and Astrophysics

Astronomy

Sun: Activity, Sun: Oscillations, Sun: Radio Radiation, Methods: Data Analysis, Methods: Statistical

Scientific paper

In this study we discuss variations of the radio emission from the Quiet Sun Areas (QSA) at centimeter wavelength (1.76 cm). Data were obtained from Nobeyama Radioheliograph (NoRH). Oscillations of selected areas were studied carefully from data taken over one week. We try to find quasi-periodic solar oscillations from the QSA. We used the traditional Fast Fourier Transform (FFT), Global Wavelet Spectrum (GWS) and Wavelet (Morlet) for studying signals in the frequency/time-frequency domain. We used the Fisher randomization test to verify the significance of the observed signal. Instrumental and sky noises were studied using a cross-correlation analysis. Additionally, a single pixel analysis were done. Wide ranges of solar oscillation periods were found from the Quiet Sun Area (QSA): 3-15, 35-70, and 90 minutes. Some physical explanations are suggested for these oscillations. However, it is not possible to give a conclusive statement about the origin of the long quasi-periodic (>60 min) oscillations from the QSA.

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