Quasiperiodic oscillations in the active solar regionsfrom the data of nobeyama radioheliograph

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Scientific paper

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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