We report on the evolution of an active region NOAA 11263 observed with SST at extreme high spatial resolution (0.15 arcsec). We analyzed spectral and spectropolarimetric data acquired at Fe I 557.6 nm and 630.2 nm spectral ranges, respectively, to study the magnetic field properties and the dynamics of the plasma in the umbral and penumbral region of the sunspot. Interestingly, images acquired in photospheric continuum show twisting motions of the penumbral filaments. Moreover, we investigate if MMFs are present during the evolution of the sunspot. Brightenings in Ca II H line are also noticed, indicating the occurrence of transient phenomena in the chromosphere.
Sunspot evolution observed with SST.
ZUCCARELLO, Francesca;GUGLIELMINO, SALVATORE;
2013-01-01
Abstract
We report on the evolution of an active region NOAA 11263 observed with SST at extreme high spatial resolution (0.15 arcsec). We analyzed spectral and spectropolarimetric data acquired at Fe I 557.6 nm and 630.2 nm spectral ranges, respectively, to study the magnetic field properties and the dynamics of the plasma in the umbral and penumbral region of the sunspot. Interestingly, images acquired in photospheric continuum show twisting motions of the penumbral filaments. Moreover, we investigate if MMFs are present during the evolution of the sunspot. Brightenings in Ca II H line are also noticed, indicating the occurrence of transient phenomena in the chromosphere.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
