The Solar Rotation and Shift Towards Red Measured in Prominence Spectra

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Abstract
Measures of the shifts of the H and K lines in prominence spectra have been continued from April 1935 to March 1939. The results confirm previous measures in showing that the prominences give values of the angular speed of rotation in different zones of latitude greatly in excess of values derived from spectra of the reversing layer, or from the motions of sunspots. The mean value of the daily angular speed in this period was 16°.9, which exceeds the equatorial speed of the reversing layer by over 2 degrees. The general shift of the H and K lines towards red in this series of measures only slightly exceeds the relativity shift of .0081 A. A comparison of the results with previous measures shows that the rotation values were about 2° per diem greater at times of maximum solar activity than near the minimum of 1933. The general shift has apparently decreased from +.015 to +.009 A. in the whole period 1926 to 1939, in which estimates have been made. The general mean of all the measures is +.012 A. or .004 A. in excess of the relativity shift.

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