Physics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...93..171g&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 93, June 1984, p. 171-175.
Physics
38
Solar Longitude, Solar Rotation, Solar Velocity, Sunspots, Angular Momentum, Correlation, Covariance, Plasma Acceleration, Solar Atmosphere
Scientific paper
Using new measurements of positions of individual sunspots and sunspot groups obtained from 62 years of the Mt. Wilson white-light plate collection, we have recomputed the correlation between longitude and latitude motion. Our results for groups are similar to those of Ward (1965a) computed from the Greenwich record, but for individual spots the covariance is reduced by a factor of about 3 from the Ward values, though still of the same sign and still statistically significant. We conclude that there is a real correlation between longitude and latitude movement of individual spots, implying angular momentum transport toward the equator as inferred by Ward. The two thirds reduction in the covariance for individual spots as opposed to groups is probably due to certain properties of spot groups, as first pointed out in an unpublished manuscript by Leighton.
Gilman Peter A.
Howard Ralph
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