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Opposite polarity field with convective downflow and its relation to magnetic spines in a sunspot penumbra
Stockholm University, Faculty of Science, Department of Astronomy. Royal Swedish Acad Sci, AlbaNova Univ Ctr, Inst Solar Phys, Stockholm, Sweden.
Stockholm University, Faculty of Science, Department of Astronomy. Royal Swedish Acad Sci, AlbaNova Univ Ctr, Inst Solar Phys, Stockholm, Sweden.
Stockholm University, Faculty of Science, Department of Astronomy. Royal Swedish Acad Sci, AlbaNova Univ Ctr, Inst Solar Phys, Stockholm, Sweden.
2013 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 553, A63- p.Article in journal (Refereed) Published
Abstract [en]

We discuss NICOLE inversions of Fe I 630.15 nm and 630.25 nm Stokes spectra from a sunspot penumbra recorded with the CRISP imaging spectropolarimeter on the Swedish 1-m Solar Telescope at a spatial resolution close to 0.'' 15. We report on narrow, radially extended lanes of opposite polarity field, located at the boundaries between areas of relatively horizontal magnetic field (the intra-spines) and much more vertical field (the spines). These lanes harbor convective downflows of about 1 km s(-1). The locations of these downflows close to the spines agree with predictions from the convective gap model (the gappy penumbra) proposed six years ago, and more recent three-dimensional magnetohydrodynamic simulations. We also confirm the existence of strong convective flows throughout the entire penumbra, showing the expected correlation between temperature and vertical velocity, and having vertical root mean square velocities of about 1.2 km s(-1).

Place, publisher, year, edition, pages
2013. Vol. 553, A63- p.
Keyword [en]
Sun: atmosphere, Sun: magnetic topology, convection, magnetic fields, magnetohydrodynamics (MHD), sunspots
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-92032DOI: 10.1051/0004-6361/201220899ISI: 000319858700063OAI: oai:DiVA.org:su-92032DiVA: diva2:637294
Note

AuthorCount:4;

Available from: 2013-07-17 Created: 2013-07-15 Last updated: 2017-12-06Bibliographically approved

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