On diurnal variations of the solar rotation rate as derived from sunspot tracings

Details On diurnal variations of the solar rotation rate as derived from sunspot tracings On diurnal variations of the solar rotation rate as derived from sunspot tracings

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...71..395k&link_type=abstract

Solar Physics, vol. 71, June 1981, p. 395-399.

Physics

10

Diurnal Variations, Solar Rotation, Spectroheliographs, Sunspots, Numerical Control, Position (Location), Tracing

Scientific paper

The heliographic positions of more than 100 sunspots were accurately measured several times a day from 1974 until 1979 by means of the computer-controlled tracking method described by Schroeter and Woehl (1975). A striking degree of constancy of the solar rotation rate (about 0.15% or 3 m/s) is found, when east-west proper motion components of each individual stable sunspot is considered. However, large differences of the rotation rate are observed (up to 7% or 130 m/s) when comparing different sunspots. We found no significant correlation of these fluctuations with characteristics of the sunspots (age, evolution, etc.).

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