Peculiarities of oscillatory processes in sunspot groups SD 135/1984 and SD 136/1984.

Details Peculiarities of oscillatory processes in sunspot groups SD 135/1984 and SD 136/1984. Peculiarities of oscillatory processes in sunspot groups SD 135/1984 and SD 136/1984.

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990bsold...9...91n&link_type=abstract

Byulletin Solnechnye Dannye Akademie Nauk USSR, No. 9/90, p. 91 - 96

Physics

2

Sunspot Groups: Oscillations, Sunspot Groups: Magnetic Fields

Scientific paper

On the basis of coordinate measurements with the "Helicor" method and simultaneous observations of sunspot magnetic fields with two solar telescopes at Kislovodsk and Pulkovo oscillations in two selected sunspot groups were studied. The non-solid, radial-asynchronous character of torsional oscillations is shown; their period increased from 45 min to 120 min with the passage from the central part of the sunspot to its periphery. Meridional oscillations are a uniform process for a force tube of a bipolar sunspot group as a whole. The horizontal velocity of propagation of magnetic field disturbances over a sunspot was estimated as 1.8 km·sec-1.

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