Motions around a decaying sunspot

Details Motions around a decaying sunspot Motions around a decaying sunspot

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..112..295m&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 112, no. 2, 1987, p. 295-303. Research supported by the Japan Society for the Promotion of

Physics

34

Faculae, Plasma Decay, Plasma Dynamics, Solar Magnetic Field, Sunspots, Convection Currents, Filtergrams, Photosphere

Scientific paper

The authors have measured the motion of facular points and granules in the same region near a decaying sunspot. It is found that both features move away across the moat surrounding the sunspot. The mean speed of facular points is larger than that of granules: 0.65 km s-1 and 0.4 km s-1, respectively. These results are consistent with previous measurements of the speed of bright network features and moving magnetic fields, as well as of non-magnetic photospherical material. They support models in which a decaying sunspot is at the center of a supergranule, whose horizontal motions sweep out granules and magnetic flux tubes associated to the facular points. It is also found that granules are dragged by supergranular motions away from the moat.

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