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

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 th...

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Bibliographic Details
Published in:Solar system research 2011-02, Vol.45 (1), p.84-91
Main Author: Dzhimbeeva, L. N.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Astroparticles
Astrophysics and Cosmology
Observations and Techniques
Physics
Physics and Astronomy
Planetology
Radio astronomy
Radio telescopes
Sun
Sunspots
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Summary: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.
ISSN:0038-0946
1608-3423
DOI:10.1134/S0038094610061012