How growth and decay of sunspot groups depend on axial tilt angles

Details How growth and decay of sunspot groups depend on axial tilt angles How growth and decay of sunspot groups depend on axial tilt angles

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..145...95h&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 145, no. 1, p. 95-103.

Physics

6

Magnetic Flux, Sunspots, Umbras, Attitude (Inclination), Coriolis Effect

Scientific paper

The average growth and decay rates of sunspot groups as a function of the tilt angles of the magnetic axes of the groups are examined on the basis of an analysis of digitized Mount Wilson sunspot data covering the interval from 1917 to 1985. It is found that in absolute terms, both growth and decay rates of groups peak at the average tile angle of the groups (about +5 deg). In percentage terms these rates are a minimum near these tilt angles because average group areas are largest at the average tilt angle. The clear peaks at the average tilt angle (rather than at 0 deg) may be related to the structure or geometry of the subsurface flux loops that form the regions. It is suggested that this is the angle that represents no twist of these subsurface flux loops. It is inferred that these loops do not get twisted, on average, during their ascent to the surface by Coriolis forces.

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