On the formation of a stable penumbra in a region of flux emergence in the Sun
arXiv:1611.04749 · doi:10.3847/1538-4357/834/1/76
Abstract
We studied the formation of the first penumbral sector around a pore in the following polarity of the Active Region (AR) NOAA 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 onboard the Solar Dynamics Observatory satellite. On the side towards 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, differently from what found by Schlichenmaier and colleaguestbf. 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.
Accepted for ApJ, 6 pages, 5 figures
References in corpus (6)
- The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: SHARPs -- Space-weather HMI Active Region Patches
- Solar surface emerging flux regions: a comparative study of radiative MHD modeling and Hinode SOT observations
- Magnetic flux emergence in granular convection: Radiative MHD simulations and observational signatures
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Cited by in corpus (6)
- IRIS observations of magnetic interactions in the solar atmosphere between pre-existing and emerging magnetic fields. II. UV emission properties
- Height dependence of the penumbral fine-scale structure in the inner solar atmosphere
- Emergence of small-scale magnetic flux in the quiet Sun
- Restoring process of sunspot penumbra
- Continuum enhancements, line profiles and magnetic field evolution during consecutive flares
- The formation and decay of sunspot penumbra in Active Region NOAA 12673