Direct measurements and short-period torsional oscillations of sunspots. I - First results

Details Direct measurements and short-period torsional oscillations of sunspots. I - First results Direct measurements and short-period torsional oscillations of sunspots. I - First results

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990kfnt....6...29d&link_type=abstract

Kinematika i Fizika Nebesnykh Tel (ISSN 0233-7665), vol. 6, July-Aug. 1990, p. 29-35. In Russian.

Computer Science

Solar Oscillations, Sunspots, Radial Velocity, Shadows, Solar Limb, Telescopes

Scientific paper

The first results of direct measurements of one of the varieties eigenmotions of sunspots (i.e., their torsional oscillations) are presented. For three sunspots, particular attention is given to the spectral composition of the radial velocity signals from two penumbra areas symmetrical with respect to the sunspot umbra near the limb. Periods in the range of 1 min to several hours are studied in detail.

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