Detalles de publicación
PP 07007
ON THE MOAT-PENUMBRA RELATION
(1) Instituto de Astrofisica de Canarias, Spain, (2) National Astronomical Observatory of Japan, Japan, (3) Institute of Theoretical Astrophysics, University of Oslo, Norway, (4) Center of Mathematics for Applications, University of Oslo, Norway.
Proper motions in a sunspot group with a delta-configuration and close to the
solar disc center have been studied by employing local correlation tracking
techniques. The analysis is based on more than one hour time series of G-band
images. Radial outflows with a mean speed of 0.67 km s^{-1} have been
detected around the spots, the well-known sunspots moats. However, these outflows are not found in those umbral core sides without penumbra. Moreover,
moat flows are only found in those sides of penumbrae located in the direction
marked by the penumbral filaments. Penumbral sides perpendicular to them show no
moat flow. These results strongly suggest a relation between the moat flow
and the well-known, filament aligned, Evershed flow. The standard picture
of a moat flow originated from a blocking of the upward propagation of
heat is commented in some detail.
solar disc center have been studied by employing local correlation tracking
techniques. The analysis is based on more than one hour time series of G-band
images. Radial outflows with a mean speed of 0.67 km s^{-1} have been
detected around the spots, the well-known sunspots moats. However, these outflows are not found in those umbral core sides without penumbra. Moreover,
moat flows are only found in those sides of penumbrae located in the direction
marked by the penumbral filaments. Penumbral sides perpendicular to them show no
moat flow. These results strongly suggest a relation between the moat flow
and the well-known, filament aligned, Evershed flow. The standard picture
of a moat flow originated from a blocking of the upward propagation of
heat is commented in some detail.