Long-period variations in the magnetic field of small-scale solar structures |
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| Authors: | P V Strekalova Yu A Nagovitsyn A Riehokainen V V Smirnova |
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| Institution: | 1.Main Astronomical (Pulkovo) Observatory,Russian Academy of Sciences,St. Petersburg,Russia;2.St. Petersburg State University,St. Petersburg,Russia;3.St. Petersburg State University of Aerospace Instrumentation,St. Petersburg,Russia;4.University of Turku,Turku,Finland |
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| Abstract: | Thirty small-scale structures in the solar atmosphere, i.e., facula nodes at ±(20°–46°) latitudes, have been studied in order to analyze quasi-periodic variations in the magnetic field. SDO/HMI magnetograms have been used for this purpose. Long-period variations in the magnetic field strength of the considered objects in the 60–280 min range have been revealed as a result of data processing. It has been shown that there are no dependences between the magnetic field and period, nor between the magnetic field and object area. It has been assumed that the discovered variations are not natural oscillations of the magnetic field strength. |
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