CAOSP abstracts, Volume: 41, No.: 2, year: 2011

Abstract: Ultraviolet synoptic observations of the O VI 1032 Ã… 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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Last update: November 09, 2011