Computer Science
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991kfnt....7...51d&link_type=abstract
Kinematika i Fizika Nebesnykh Tel (ISSN 0233-7665), vol. 7, Sept.-Oct. 1991, p. 51-60. In Russian.
Computer Science
Penumbras, Periodic Variations, Photosphere, Solar Oscillations, Sunspots, Noaa Satellites, Solar Magnetic Field, Solar Spectra, Torsional Vibration
Scientific paper
Results of observations of the tangential velocity in the Evershed effect (torsional oscillations of sunspots) are presented. For six sunspots, the spectral composition of line-of-sight velocity signals from two areas of the penumbra located symetrically relative to the sunspot umbra is investigated. The presence of torsional oscillations of sunspots at the photospheric level with a period of about one hour is confirmed. On the basis of observations of two sunspots during three and four days, it is concluded that these sunspots exhibit torsional oscillations with a period of several days.
Druzhinin S. A.
Levkovskii V. I.
Nikonova Marina V.
Pevtsov Alexander
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