Concerning time variation observations of the global magnetic field of the Sun |
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| Authors: | M L Demidov |
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| Institution: | (1) Institute of Solar-Terrestrial Physics, P.O. Box 4026, 664033 Irkutsk, Russia |
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| Abstract: | This paper is devoted to an analysis of some technique questions inherent in the problem of detection of weak periodic variations of the magnetograph signal in observations of large-scale magnetic fields on the Sun. Namely, using observational data obtained at the Sayan observatory STOP telescope (Grigoryevet al., 1981; Grigoryev and Demidov, 1987), we address the question of the dependence of signal strength variations in observations of the global magnetic field of the Sun on some other parameters recorded during observations: brightness, the position of the zero level, and the ratio of intensities of the splitting components. It is pointed out that, although the influence of these parameter variations can occur at several frequencies, the least reliable are long-period oscillations of the magnetic field with periodsP >L/2, whereL is the realization length. The most reliable for the data being analyzed are field variations with periods of 29 and 80 min, and the proximity of the latter to the harmonic of the well-known 160-min pulsations of the Sun suggests their possible relationship, but further investigations are needed. |
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