Coronal differential rotation from UVCS/SOHO synoptic observations

Details Coronal differential rotation from UVCS/SOHO synoptic observations Coronal differential rotation from UVCS/SOHO synoptic observations

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011coska..41..142m&link_type=abstract

Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 41, no. 2, p. 142-148.

Astronomy and Astrophysics

Astronomy

Sun: Corona, Sun: Rotation, Sun: Uv Radiation

Scientific paper

Ultraviolet synoptic observations of the O VI 1032 Å spectral line from the UltraViolet Coronagraph Spectrometer (UVCS) telescope aboard the Solar and Heliospheric Observatory (SOHO) have been analyzed in order to establish the rotational characteristics of the solar corona during the minimum and maximum phases of solar cycle 23. By using both autocorrelation and spectral analysis techniques, we determined the solar-cycle dependence of the rotation rate in the middle corona. The UV corona is found to rotate more rapidly and rigidly than the underlying sunspots and photospheric plasma. A systematic and substantial acceleration of the equatorial rotation rate is observed to occur around solar maximum.

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