Propagating Spectropolarimetric Disturbances in a Large Sunspot

M. Stangalini, S. Jafarzadeh, I. Ermolli, R. Erdélyi, D. B. Jess, P. H. Keys, F. Giorgi, M. Murabito, F. Berrilli, D. Del Moro

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15 Citations (Scopus)

Abstract

We present results derived from the analysis of spectropolarimetric measurements of active region AR12546, which represents one of the largest sunspots to have emerged onto the solar surface over the last 20 years. The region was observed with full-Stokes scans of the Fe I 617.3nm and Ca II 854.2 nm lines with the Interferometric BIdimensional Spectrometer instrument at the Dunn Solar Telescope over an uncommon,extremely long time interval exceeding three hours. Clear circular polarization (CP) oscillations localized at the umbra–penumbra boundary of the observed region were detected. Furthermore, the multi-height data allowed us to detect the downward propagation of bothCP and intensity disturbances at 2.5–3 mHz, which was identified by a phase delay between these two quantities. These results areinterpreted as a propagating magneto hydrodynamic surface mode in the observed sunspot.
Original languageEnglish
Article number110
Number of pages7
JournalThe Astrophysical Journal
Volume869
Issue number2
Early online date17 Dec 2018
DOIs
Publication statusEarly online date - 17 Dec 2018

Keywords

  • polarization
  • Sun: chromosphere
  • Sun: magnetic fields
  • Sun: oscillations
  • Sun: photosphere
  • sunspots

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