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Long-Period Oscillations of Sunspots With SOHO/MDI Data  

Vyacheslav Efremov   Submitted: 2013-11-24 10:56

We present the results of processing of magnetograms which were obtained with Solar and Heliospheric Observatory (SOHO). The results confirm the basic properties of long-period oscillations of sunspots established by authors earlier and reveal the new ones. It is shown that a limiting (lowest) eigen mode of low-frequency oscillations of a sunspot as a whole structure is the mode with the period of 10 to 22 hrs (depending on sunspot's magnetic field strength). Lower mode with the period of about 1.5-2 days normally observed in a power spectrum of sunspots, apparently, is not the eigen mode of a sunspot because its period does not depend on the magnetic field of the sunspot. Perhaps, it reflects the quasi-periodical perturbations of sunspot caused by the supergranulation cells surrounding it. The artifacts of MDI (SOHO) device, which may affect the low-frequency power spectra of sunspots, are analyzed.

Authors: Efremov Vyacheslav, Parfinenko Leonid, Solov'ev Alexandr, Kirichek Elena
Projects: SoHO-MDI

Publication Status: Solar Physic, Final decision accept 07 Nov 2013
Last Modified: 2013-11-25 08:32
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Long-Period Oscillations of Sunspots With SOHO/MDI Data

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