Abstract
The use of integral characteristics of radio spots showed that in addition to the known 3–5-min oscillations, the above-spot regions of sunspots exhibit quasiperiodic oscillations of intensity, perimeter, sectional area, and area of the surface of the above-spot source radio image with periods in the ranges of 25–80, 90–110, 120–140, and 160–210 min. These periods are observed for all spots studied using the different characteristics of a radio source, which does not contradict the interpretation of these low-frequency oscillations as natural oscillations of spots near a certain position of stable equilibrium.
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Original Russian Text © L.N. Dzhimbeeva, 2011, published in Astronomicheskii Vestnik, 2011, Vol. 45, No. 1, pp. 85–91.
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Dzhimbeeva, L.N. Quasiperiodic oscillations in the active solar regionsfrom the data of nobeyama radioheliograph. Sol Syst Res 45, 84–91 (2011). https://doi.org/10.1134/S0038094610061012
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DOI: https://doi.org/10.1134/S0038094610061012