Large-Scale Transport of Magnetic Flux on the sun |
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Authors: | Ambrož P |
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Institution: | (1) Astronomical Institute, Academy of Sciences of the Czech Republic, CZ-25165 Ondřejov, Czech Republic |
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Abstract: | The structure of the large-scale background magnetic field evolves in time and space. The large-scale horizontal transport
velocity field of the magnetic flux patterns was inferred over the whole solar photosphere in the course of two solar activity
cycles from year 1976 to 1999. The method of velocity determination and the testing procedures of the velocity accuracy are
presented. The non-axially symmetric component of the horizontal velocity was found and both zonal and meridional velocity
regions were described. The horizontal large-scale transport velocity regions vary in shape and the intensity during different
phases of the 11-year solar activity cycle. The total horizontal transport velocity is characterized by the presence of variable
amounts of the vector field vortices with symmetric orientation relative to the solar equator. The zonal velocity regions,
distributed inside of the zonal belt limited by latitudes ± 35°, are persistent for about 4 Carrington rotations. Recurrent
structures of similar velocity distributions are not coherent over the whole solar photosphere. |
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