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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27825
Title: ON THE FORMATION OF A STABLE PENUMBRA IN A REGION OF FLUX EMERGENCE IN THE SUN
Authors: MURABITO, MARIARITA 
Romano, P.
Guglielmino, S. L.
Zuccarello, Francesca 
Issue Date: 2017
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 834
Issue: 1
First Page: 76
Abstract: We studied the formation of the first penumbral sector around a pore in the following polarity of the NOAA Active Region (AR) 11490. We used a high spatial, spectral, and temporal resolution data set acquired by the Interferometric BIdimensional Spectrometer operating at the NSO/Dunn Solar Telescope, as well as data taken by the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory satellite. On the side toward the leading polarity, elongated granules in the photosphere and an arch filament system (AFS) in the chromosphere are present, while the magnetic field shows a sea-serpent configuration, indicating a region of magnetic flux emergence. We found that the formation of a stable penumbra in the following polarity of the AR begins in the area facing the opposite polarity located below the AFS in the flux emergence region, different from what was found by Schlichenmaier and colleagues. Moreover, during the formation of the first penumbral sector, the area characterized by magnetic flux density larger than 900 G and the area of the umbra increase.
URI: http://hdl.handle.net/20.500.12386/27825
URL: https://iopscience.iop.org/article/10.3847/1538-4357/834/1/76
ISSN: 0004-637X
DOI: 10.3847/1538-4357/834/1/76
Bibcode ADS: 2017ApJ...834...76M
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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