Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....47..475d&link_type=abstract
Astronomy and Astrophysics, vol. 47, no. 3, Mar. 1976, p. 475-477.
Astronomy and Astrophysics
Astrophysics
15
Magnetic Flux, Photosphere, Solar Granulation, Solar Magnetic Field, Magnetic Diffusion, Magnetic Field Configurations, Solar Atmosphere, Sunspots, Velocity Distribution
Scientific paper
The discovery that magnetic flux in the solar photosphere outside of sunspots occurs only in the form of highly concentrated flux elements of subgranular size with high maximum fields of the order of 1.5 kG has prompted a continuing discussion of how these fragile structures are being produced and protected against rapid diffusion and dissipation. In this context, an adequate quantitative picture of the photospheric (granular) velocity field is of crucial importance. In particular, high vertical velocities are required for models in which the magnetic-flux elements are kept in a nonstationary dynamical equilibrium configuration with reduced internal gas pressure by a pumping mechanism. It is of interest to review some recent observations which indicate that the granular velocities are locally much higher (as high as 6 km/s), than the values commonly assumed.
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