Fine structure and Evershed motions in the sunspot penumbra

Details Fine structure and Evershed motions in the sunspot penumbra Fine structure and Evershed motions in the sunspot penumbra

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...44..409g&link_type=abstract

Solar Physics, vol. 44, Oct. 1975, p. 409-415.

Physics

17

Fine Structure, Penumbras, Sunspots, Astronomical Models, Convection Currents, Filaments, Magnetic Flux, Magnetohydrostatics

Scientific paper

The observed inhomogeneity of the intensity and Evershed motions means that any model of a penumbra must be essentially inhomogeneous. A simple model is put forward in which the interaction of convection rolls with an initially homogeneous magnetohydrostatic sunspot field causes a concentration of flux in the dark filaments. This process drives Evershed motions outwards in these regions; the motions are superficial and shear the lines of force, so that the field appears stronger and more horizontal in the dark filaments. This situation must be time-dependent to avoid rapid destruction of the whole spot.

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