Reliability of sunspots as tracers of solar surface rotation

Details Reliability of sunspots as tracers of solar surface rotation Reliability of sunspots as tracers of solar surface rotation

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.260..227b&link_type=abstract

Nature, vol. 260, Mar. 18, 1976, p. 227-229.

Physics

7

Angular Velocity, Plasma Dynamics, Solar Rotation, Sunspots, Umbras, Line Spectra, Photosphere, Plasma Spectra, Solar Spectra, Solar Wind, Titanium, Tracers, Velocity Measurement

Scientific paper

Spectrographic measurements consisting of sequences of spectra of sunspot umbrae in the neutral titanium line at 571.39 nm are analyzed to investigate the relation of plasma rotation velocity measurements inside sunspot umbrae to the rotation velocities derived from sunspot proper motions. The observed plasma rotation velocity is found to be significantly less than the sunspot proper motion rotation velocity. Since the plasmas inside and outside the spots rotate at similar rates, it is concluded that sunspots make poor tracers for solar surface motions.

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