Formation of a penumbra in a decaying sunspot

Context. Penumbrae are an important characteristic of sunspots, whose formation is intricately related to the nature of sub-photospheric magnetic fields. Aims. We study the formation of a penumbra in a decaying sunspot and compare its properties with those seen during the development of a proto-spot...

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Veröffentlicht in:	Astronomy and astrophysics (Berlin) 2013-04, Vol.552, p.np-np
Hauptverfasser:	Louis, R. E., Mathew, S. K., Puschmann, K. G., Beck, C., Balthasar, H.
Format:	Artikel
Sprache:	eng
Schlagworte:	Coalescence Coalescing Decay Filaments Flux Formations Penumbras Sun: photosphere Sun: surface magnetism Sunspots techniques: photometric techniques: polarimetric
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