Journal Article

Spectropolarimetery of umbral fine structures from Hinode: evidence for magnetoconvection

Lokesh Bharti, Chandan Joshi, S. N. A. Jaaffrey and Rajmal Jain

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 393, issue 1, pages 65-70
Published in print February 2009 | ISSN: 0035-8711
Published online January 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.14203.x
Spectropolarimetery of umbral fine structures from Hinode: evidence for magnetoconvection

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We present spectropolarimetric analysis of umbral dots and a light bridge fragment that show dark lanes in G-band images. Umbral dots show upflow as well as associated positive Stokes V area asymmetry in their central parts. Larger umbral dots show downflow patches in their surrounding parts that are associated with negative Stokes V area asymmetry. Umbral dots show weaker magnetic field in central part and higher magnetic field in peripheral area. Umbral fine structures are much better visible in total circularly polarized light than in continuum intensity. Umbral dots show a temperature deficit above dark lanes. The magnetic field inclination shows a cusp structure above umbral dots and a light bridge fragment. We compare our observational findings with 3D magnetohydrodynamic simulations.

Keywords: Sun: granulation; Sun: magnetic fields; Sun: photosphere; sunspots

Journal Article.  3765 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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