Rotation and expansion within sunspot groups

Details Rotation and expansion within sunspot groups Rotation and expansion within sunspot groups

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303..480g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 1, 1986, p. 480-485.

Astronomy and Astrophysics

Astrophysics

11

Atmospheric Circulation, Gas Expansion, Solar Atmosphere, Solar Rotation, Sunspots, Angular Velocity, Solar Cycles

Scientific paper

By superposing data for many sunspot groups measured on the Mount Wilson white-light plate collection, the authors demonstrate that differential rotation, about equal to the ambient rate, occurs between sunspots within the group. It is also shown that the relative motions of leader and follower sunspots can be characterized primarily as a simple expansion of the group along its major axis, with very little rotation of the pattern about group center.

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