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ESP Online Seminar: Multi-height spectropolarimetric study of MHD waves in a big sunspot observed with IBIS (M. Stangalini)

  • Date: Sep 20, 2018
  • Time: 11:00 - 12:00
  • Speaker: Marco Stangalini
  • INAF-OAR National Institute for Astrophysics, Rome, Italy
  • Location: University of Glasgow (broadcasted at MPS)
  • Room: Aquila + Bootes
  • Host: Andreas Lagg
We present preliminary 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 617.3 nm and Ca II 854.2 nm lines with the Interferometric BIdimensional Spectrometer (IBIS) instrument at the Dunn Solar Telescope over an uncommon, extremely long time interval exceeding three hours. We show preliminary results from the phase lag analysis of different quantities and discuss the results in terms of the literature on the subject and MHD wave propagation theory.

We present preliminary 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 617.3 nm and Ca II 854.2 nm lines with the Interferometric BIdimensional Spectrometer (IBIS) instrument at the Dunn Solar Telescope over an uncommon, extremely long time interval exceeding three hours. We show preliminary results from the phase lag analysis of different quantities and discuss the results in terms of the literature on the subject and MHD wave propagation theory.



 
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