2007/02/08 by L. L. Kitchatinov, Kitchatinov, L. L., G. Ruediger +2
Physics and Astronomy · #Astrophysics (astro-ph) #Cosmology and Gravitation Theories #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Solar and Space Plasma Dynamics #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0702232
4 pages, 3 figures, submitted to F. Kneer et al. (eds.) Modern Solar Facilities -- Advanced Solar Science
openalex publication_date 2007/02/08 · arxiv created 2007/02/12 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A theoretical sunspot model is provided including magnetic suppression of the diffusivities and also a strong stratification of density and temperature. Heat diffusion alone with given magnetic field and zero mean flow only produces (after a very long relaxation time) dark spots without any bright ring. Models with full dynamics of both field and flow, however, provide rings and also the observed correlation of ring temperature excess and the spot size. The rings are formed as the result of heat transport by the resulting flow system and increased thermal diffusivity due to reduced magnetic quenching around spots.