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Additional measurements of the high-latitude sunspot rotation rate

✍ Scribed by Donald A. Landman; Jill T. Takushi

Publisher
Springer
Year
1981
Tongue
English
Weight
171 KB
Volume
73
Category
Article
ISSN
0038-0938

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✦ Synopsis

We report measurements of the sunspot rotation rate at high sunspot latitutdes for the years 1966-1968. Ten spots at [latitude[-> 28 deg were found in our Mees Solar Observatory Ha patrol records for this period that are suitable for such a study. On the average we find a sidereal rotation rate of 13.70a:0.07 deg day 1 at 31.05+0.01 deg. This result is essentially the same as that obtained by Tang (1980) for the succeeding solar cycle, and significantly larger than Newton and Nunn's (1951) results for the 1934-1944 cycle. Taken together, the full set of measurements in this latitude regime yield a rotation rate in excellent agreement with the result to = 14.~176 sin 2 &, derived by Newton and Nunn from recurrent spots predominatly at lower latitudes throughout the six cycles from 1878-1944.

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