Local rigid rotation and the emergence of active centres

Details Local rigid rotation and the emergence of active centres Local rigid rotation and the emergence of active centres

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183..129m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 1, Sept. 1987, p. 129-134.

Astronomy and Astrophysics

Astrophysics

36

H Alpha Line, K Lines, Solar Activity, Solar Prominences, Solar Rotation, Spectroheliographs, Stellar Flares

Scientific paper

Deviations from the mean solar rotation rule of filaments are frequent. They correspond to real physical behaviour. Using filaments as tracers, limited solar areas of rigid rotation are observed: these are "pivot points" around which the filaments rotate during two or more successive rotations. It is shown that a relation exists between the pivot points and Active Centres: many Active Centres appear close to a pivot point whatever their latitude, whereas filaments which reveal the classical differential rotation do not generate any Active Centres. The magnetic flux emergence is associated in time with apparent reduced speed of the filament tilt about the pivot point. Some examples show that the relation exists using a reduced time scale of several days as well. The new Active Centre may destroy or displace the associated pivot point.

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