Multiwavelength study of penumbral decay using GREGOR, VTT, DST, NST, and Hinode
Leibniz-Institut Fuer Astrophysik Potsdam (AIP)
Main category
Natural Sciences (Astrophysics and Astrononmy)
Active region NOAA 12597 emerged on 22 September 2016 in southern hemisphere. The region was observed two days later on 24 September 2016 with GREGOR, VTT, NST, and Hinode during a campaign organized as part of the SOLARNET initiative for coordinated observing campaigns. The leading spot of the region was observed for the next four days. We obtained high-resolution imaging, spectroscopic, and spectropolarimetric data in various spectral lines covering the photosphere as well as the chromosphere. These data were complemented by synoptic line-of-sight magnetograms and continuum images obtained with the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory (SDO) and slit-jaw images from the Interface Region Imaging Spectrograph (IRIS). We will present the dataset taken on 24 September 2016 containing the leading spot. The sunspot was at its maximum growth and slowly started to disintegrate at the time of GREGOR and VTT observations followed by the observations from Hinode and NST a few hours later. We will discuss the photospheric and chromospheric flow fields along with the magnetic fields during the penumbral decay of a large penumbral sector. The penumbral filaments do not simply vanish but intermingle with the nearby granules and even temporarily form darkened areas resembling umbral cores filled with umbral dots.
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