A distinct magnetic property of the inner penumbral boundary. II. Formation of a penumbra at the expense of a pore

Bibcode
2017A&A...597A..60J
DOI
10.1051/0004-6361/201628547
Jurčák, J.; Bello González, N.; Schlichenmaier, R.; Rezaei, R.
Bibliographical reference

Astronomy and Astrophysics, Volume 597, id.A60, 4 pp.

Advertised on:
1
2017
Journal
Astronomy and Astrophysics
Number of authors
4
IAC number of authors
1
Citations
28
Refereed citations
25
Description
Context. We recently presented evidence that stable umbra-penumbra boundaries are characterised by a distinct canonical value of the vertical component of the magnetic field, Bstablever. In order to trigger the formation of a penumbra, large inclinations in the magnetic field are necessary. In sunspots, the penumbra develops and establishes by colonising both umbral areas and granulation, that is, penumbral magneto-convection takes over in umbral regions with Bver
Related projects
Project Image
Magnetism, Polarization and Radiative Transfer in Astrophysics
Magnetic fields pervade all astrophysical plasmas and govern most of the variability in the Universe at intermediate time scales. They are present in stars across the whole Hertzsprung-Russell diagram, in galaxies, and even perhaps in the intergalactic medium. Polarized light provides the most reliable source of information at our disposal for the
Tanausú del
Pino Alemán
In progress
Type
Refereed
Solar Physics (FS)
Magnetic fields
Sunspots

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