Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...600.1073w&link_type=abstract
The Astrophysical Journal, Volume 600, Issue 2, pp. 1073-1090.
Astronomy and Astrophysics
Astronomy
60
Magnetohydrodynamics: Mhd, Sun: Magnetic Fields, Sun: Photosphere, Sun: Sunspots
Scientific paper
This paper offers the first coherent picture of the interactions between convection and magnetic fields that lead to the formation of the complicated filamentary structure of a sunspot penumbra. Recent observations have revealed the intricate interlocking-comb structure of the penumbral magnetic field. Some field lines, with associated Evershed outflows, plunge below the solar surface near the edge of the spot. We claim that these field lines are pumped downward by small-scale granular convection outside the sunspot. This mechanism is demonstrated in numerical experiments. Magnetic pumping is a key new ingredient that links several theoretical ideas about penumbral structure and dynamics; it explains not only the abrupt appearance of a penumbra as a pore increases in size but also the behavior of moving magnetic features outside a spot.
Brummell Nicholas H.
Thomas John H.
Tobias Steven M.
Weiss Nigel O.
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