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A new type of small-scale downflow patches in sunspot penumbrae
- 1.0350115 - ASÚ 2011 RIV FR eng J - Journal Article
Katsukawa, Y. - Jurčák, Jan
A new type of small-scale downflow patches in sunspot penumbrae.
Astronomy & Astrophysics. Roč. 524, December (2010), A20/1-A20/9. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA AV ČR IAA300030808
Institutional research plan: CEZ:AV0Z10030501
Keywords : Sun * photosphere * surface magnetism * sunspots * chromosphere
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics
Impact factor: 4.410, year: 2010
Using the Hinode spectro-polarimetric observations of Fe I 630 nm lines and their inversions, we found photospheric downflows in the sunspot penumbra that have the same magnetic polarity as the sunspot umbra. The Stokes profiles seen in the patches are characterized as humps or enhancements on the red wing of the Stokes V profiles. Probably owing to the small size, such downflow patches have not been previously reported in penumbrae. These downflows are not related to the Evershed flow. They are mostly found inside the bright penumbral filaments and in the disk-center side penumbra in our data. We also found that some of the downflow patches are temporally and spatially coincident with chromospheric brightenings in the Ca II H images.
Permanent Link: http://hdl.handle.net/11104/0190199
Number of the records: 1