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CRISP spectropolarimetric imaging of penumbral fine structure
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- Scharmer, Göran B. (author)
- Stockholms universitet,Institutionen för astronomi,Kungl. Vetenskapsakademiens inst. f. solfysik
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- Narayan, Gautam (author)
- Stockholms universitet,Institutionen för astronomi,Kungl. Vetenskapsakademiens inst. f. solfysik
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- Hillberg, Tomas (author)
- Stockholms universitet,Institutionen för astronomi,Kungl. Vetenskapsakademiens inst. f. solfysik
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- Lagg, Andreas (author)
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- (creator_code:org_t)
- 2008-11-03
- 2008
- English.
- In: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8205 .- 0004-637X .- 1538-4357. ; 689:1, s. L69-
- Journal article (peer-reviewed)
Abstract
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- 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.
Keyword
- sunspot
- polarimetry
- sun
- spectropolarimetry
- NATURAL SCIENCES
- NATURVETENSKAP
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- ref (subject category)
- art (subject category)
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