Physics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..136..251h&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 136, Dec. 1991, p. 251-262.
Physics
45
Magnetic Flux, Solar Activity, Solar Magnetic Field, Sunspots, Astronomical Photography, Attitude (Inclination), Solar Observatories
Scientific paper
Tilt angles determined from the area-weighted positions of leading and following sunspots are examined using digitized Mount Wilson sunspot data from 1917 to 1985. These spot group tilt angles are examined in relation to other group characteristics to provide information which may relate to the formation and evolution of sunspot groups and the magnetic connection of groups to subsurface magnetic flux tubes. Spot group axial tilts are found to average 4.2 deg, with a peak near 5 deg. This represents a tilt with the leading portions of the groups slightly equatorward of the following portions. Average spot group areas of groups near the average tilt angle are significantly greater than those of groups on either side of the average. On average, the largest groups are found near the average tilt angle. Group tilt angles are greater on average at higher latitudes, confirming earlier results. For groups within 25 deg of the average orientation, those groups with smaller or more negative tilt angles have on average latitude drifts that are more in the poleward direction. Groups nearest the average tilt angle rotate the fastest.
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