uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Opposite polarity field with convective downflow and its relation to magnetic spines in a sunspot penumbra
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Space Plasma Physics.
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
Natural Sciences
URN: urn:nbn:se:uu:diva-203674DOI: 10.1051/0004-6361/201220899ISI: 000319858700063OAI: oai:DiVA.org:uu-203674DiVA: diva2:637459
Available from: 2013-07-18 Created: 2013-07-17 Last updated: 2013-07-18Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
de la Cruz Rodriguez, Jaime
By organisation
Space Plasma Physics
In the same journal
Astronomy and Astrophysics
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 525 hits
ReferencesLink to record
Permanent link

Direct link