Orphan penumbrae are filamentary structures, very similar to the penumbral filaments, but that are not adjacent to any sunspot umbra. We observed an orphan penumbra in NOAA 11089 during a coordinated observational campaign, involving the Hinode/SOT and DOT telescopes. The spectropolarimetric measurements indicate the presence of both significant upflows and downflows in the orphan penumbra region, that decrease in time. A neutral line is present in the region, with a strong horizontal component of the vector magnetic field. We investigate the association of such structure with other features in the low chromosphere.

An orphan penumbra observed with Hinode and DOT

ZUCCARELLO, Francesca;GUGLIELMINO, SALVATORE
2013

Abstract

Orphan penumbrae are filamentary structures, very similar to the penumbral filaments, but that are not adjacent to any sunspot umbra. We observed an orphan penumbra in NOAA 11089 during a coordinated observational campaign, involving the Hinode/SOT and DOT telescopes. The spectropolarimetric measurements indicate the presence of both significant upflows and downflows in the orphan penumbra region, that decrease in time. A neutral line is present in the region, with a strong horizontal component of the vector magnetic field. We investigate the association of such structure with other features in the low chromosphere.
Sun: photosphere; Sun: surface magnetism; Techniques: high angular resolution
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11769/96816
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