Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...242..480z&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 242, no. 2, Feb. 1991, p. 480-487. MPI-supported research.
Astronomy and Astrophysics
Astrophysics
31
Angular Velocity, Photosphere, Solar Rotation, Sunspots, Solar Atmosphere, Solar Magnetic Field
Scientific paper
From the analysis of the Greenwich Photoheliographic Results sunspot-groups data from 1874 to 1976, it has been found that the sunspot-groups angular velocity is not invariant with time during the first 2.5 x 10 to the 6th s of their life, showing a nonrandom negative acceleration. More precisely, 2-day-old sunspot-groups have, at all the latitude strips, angular velocities which are, on average, 0.3 degrees/day higher than recurrent sunspots. Moreover, the angular velocity difference between sunspot-groups of age less than 860,000 s and recurrent sunspots decreases with time, and after 2 rotations, the angular velocity is almost equal to the plasma velocity. On the basis of these results, the problem of the determination of the solar photospheric rotation has been reexamined. The implications of a higher angular velocity of young tracers on the subphotospheric layer rotation are discussed.
Zappalà R. A.
Zuccarello Francesca
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