Sunspots: The puzzling structure of a sunspot

Details Sunspots: The puzzling structure of a sunspot Sunspots: The puzzling structure of a sunspot

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26g....45d..28t&link_type=abstract

Astronomy & Geophysics, Volume 45, Issue 4, pp. 4.28-4.33.

Physics

Geophysics

3

Scientific paper

High-resolution observations of fine structure in sunspots have at last made it possible to answer a very old question: what causes the filamentary structure of the penumbra, with magnetic fields forming an interlocking comb-like configuration, that surrounds the dark central umbra of a sunspot? This unexpected geometry can only be explained by an understanding of the interaction between magnetic fields and small-scale turbulent convection outside the spot. This interaction leads to downwards transport of magnetic flux, submerging magnetic flux tubes below the solar surface and resulting in a strongly fluted structure. An idealized version of this process can be demonstrated in numerical experiments.

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