Other
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...295..233g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 295, Aug. 1, 1985, p. 233-240.
Other
26
Solar Rotation, Sunspots, Covariance, Momentum Transfer, Solar Cycles
Scientific paper
The rotation rates of leader and follower sunspots found on Mount Wilson white light plates have been measured for the years 1917-1983. It is found that at all latitudes, leader spots rotate faster than follower spots by about 0.1 deg per day, or 14 m/s. It is also found that, when examined separately, leaders and followers show the same variations in rotation with cycle phase as do all spots taken together, as reported earlier in Gilman and Howard (1984). Leaders and followers show similar variations in rotation rate even on an annual basis. Thus, while leaders and followers in each group diverge in longitude from each other at an average rate of about 0.1 deg per day, each is separately speeding up or slowing down its rotation according to the phase in the cycle, and by a similar amount. Leaders and followers also give about the same covariance of longitude and latitude motions, indicating that whole sunspot groups participate in tracing the apparent angular momentum transport toward the equator, as previously reported for all spots in Gilman and Howard (1984).
Gilman Peter A.
Howard Ralph
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