On changes of the rotation velocities of stable, recurrent sunspots and their interpretation with a flux tube model

Details On changes of the rotation velocities of stable, recurrent sunspots and their interpretation with a flux tube model On changes of the rotation velocities of stable, recurrent sunspots and their interpretation with a flux tube model

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...76...21b&link_type=abstract

Solar Physics, vol. 76, Feb. 1982, p. 21-28.

Physics

41

Angular Velocity, Solar Flux, Solar Rotation, Sunspots, Astronomical Models, Error Analysis, Photosphere, Steady State

Scientific paper

The angular rotation velocities of stable, recurrent sunspots are investigated on the basis of data from the publication Greenwich Photoheliographic Results (1940 through 1968). Constant rotation velocities are found during the passages on the solar disk, with errors of approximately + or - 4 m/sec. During their lifetime, the spots show a decreasing braking of their rotation velocities from 0.8 to 0.3 m/sec per day. A plausible interpretation is arrived at by assuming the spots to be coupled to a slowly rising subsurface flux tube and a rotation velocity which increases with depth.

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