Long quasi-periodic oscillations of sunspots and nearby magnetic structures

V. Smirnova, A. Riehokainen, A. "Solov'ev", J. Kallunki, A. Zhiltsov, V. Ryzhov

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Aims. Simultaneous study of long quasi-periodic oscillations in sunspots (using line-of-sight magnetic field data) and nearby magnetic structures located above them (using radio emission data at 37 GHz) was the basic aim of this work. Methods. Data from the ground-based radio-telescope (Metsähovi Radio Observatory, Aalto University, Finland) and the Helioseismic and Magnetic Imager instrument on-board the Solar Dynamics Observatory spacecraft were obtained and analyzed. We used the wavelet (Morlet) analysis and the fast Fourier transform (FFT) method to obtain the oscillation periods. Results. Long-period oscillations in intervals of 200-400 min were found both in radio and in magnetic field data. The interpretation of these oscillations and their propagation to higher levels of the solar atmosphere are discussed in the context of a shallow sunspot model. © 2013 ESO.
Original languageEnglish
Article numberA23
Number of pages7
JournalAstronomy and Astrophysics
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed


  • Sun: oscillations
  • Sun: radio radiation
  • sunspots

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