Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...276..193b&link_type=abstract
Astronomy and Astrophysics, Vol. 276, p. 193 (1993)
Astronomy and Astrophysics
Astrophysics
15
Sun: Activity, Sun: Flares, Sun: Magnetic Fields, Sun: Photosphere, Sun: Motions
Scientific paper
On the basis of abundant observational data we have studied photo spheric evolution, changes in the longitudinal magnetic field distribution and magnetic fluxes in the large, complicated flare-active region NOAA 6659. Special attention was given to the study of the proper motions of its individual umbrae, and the tine-of-sight velocities in the whole region. All the observed changes are compared with the appearance of large, white-light flares. The development of this AR during three preceding and two following solar rotations is also mentioned.
The velocities of the spot displacements (varying mostly from about 10 to 100 s-1 at the most), as well as their directions, are strongly influenced by the changes of magnetic activity and spot formation, and by disintegration of the group. These seem to coincide with the regions of the strong "reversed" line-of-sight motions. In these places the mutual orientations of the negative and positive velocity areas are "reversed", if compared with the Evershed effect flows, occupying the whole active region.
The mutual relations of these particular motions with the magnetic field topology and the close connections of flares there with are also discussed. Since the observed motions and magnetic fields may in certain areas of the studied AR mutually interact, we believe that local motions play a very significant role in its restructuring and possibly also in its flaring capacity.
Bumba Vaclav
Gyori Lajos
Kalman Béla
Klvana Mirek
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