CRISP spectropolarimetric imaging of penumbral fine structure
2008 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, Vol. 689, no 1, L69- p.Article in journal (Refereed) Published
We discuss penumbral fine structure in a small part of a pore, observed with the CRISP imaging spectropolarimeter at the Swedish 1-m Solar Telescope (SST), close to its diffraction limit of 0.16 . Milne-Eddington inversions applied to these Stokes data reveal large variations of field strength and inclination angle over dark-cored penumbral intrusions and a dark-cored light bridge. The mid-outer part of this penumbra structure shows 0.3 wide spines, separated by 1.6 (1200 km) and associated with 30° inclination variations. Between these spines, there are no small-scale magnetic structures that easily can be identified with individual flux tubes. A structure with nearly 10° more vertical and weaker magnetic field is seen midway between two spines. This structure is cospatial with the brightest penumbral filament, possibly indicating the location of a convective upflow from below.
Place, publisher, year, edition, pages
2008. Vol. 689, no 1, L69- p.
sunspot, polarimetry, sun, spectropolarimetry
IdentifiersURN: urn:nbn:se:su:diva-16337DOI: 10.1086/595744ISI: 000262733800018OAI: oai:DiVA.org:su-16337DiVA: diva2:182857