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

J. Kallunki, A. Riehokainen

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

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. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Original languageEnglish
Pages (from-to)20-25
Number of pages6
JournalAstronomische Nachrichten
Volume333
Issue number1
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

Keywords

  • methods: data analysis
  • methods: statistical
  • Sun: activity
  • Sun: oscillations
  • Sun: radio radiation

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