Physics
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..149...23h&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 149, no. 1, p. 23-29
Physics
9
Attitude (Inclination), Contraction, Coriolis Effect, Expansion, Magnetic Field Configurations, Rotation, Solar Magnetic Field, Sunspots, Amplitudes, Image Analysis, Latitude, Spectroheliographs
Scientific paper
The rotation of the magnetic axes of sunspot groups is studied as a function of the expansion and contraction of the groups along their magnetic axes. In general, except for the extreme values of tilt-angle change, slow rates of rotation of the magnetic axes are associated with low values of expansion or contraction, and faster rotation of the magnetic axes is associated with rapid expansion or contraction. The direction of rotation of the magnetic axes is related to expansion or contraction in the sense that would be predicted by the Coriolis force. A comparison of the effect at high and low latitudes shows a difference that further supports the Coriolis force hypothesis, and an examination of the amplitude of the effect also suggests that the Coriolis force may be a factor in the tilt-angle rotation of spot groups.
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