Spectropolarimetric Evidence for a Siphon Flow along an Emerging Magnetic Flux Tube

Iker S. Requerey, B. Ruiz Cobo, J. C.Del Toro Iniesta, D. Orozco Suárez, J. Blanco Rodríguez, S. K. Solanki, P. Barthol, A. Gandorfer, L. Gizon, J. Hirzberger, T. L. Riethmüller, M. Van Noort, W. Schmidt, V. Martínez Pillet, M. Knölker

Research output: Contribution to journalArticlepeer-review


We study the dynamics and topology of an emerging magnetic flux concentration using high spatial resolution spectropolarimetric data acquired with the Imaging Magnetograph eXperiment on board the sunrise balloon-borne solar observatory. We obtain the full vector magnetic field and the line of sight (LOS) velocity through inversions of the Fe i line at 525.02 nm with the SPINOR code. The derived vector magnetic field is used to trace magnetic field lines. Two magnetic flux concentrations with different polarities and LOS velocities are found to be connected by a group of arch-shaped magnetic field lines. The positive polarity footpoint is weaker (1100 G) and displays an upflow, while the negative polarity footpoint is stronger (2200 G) and shows a downflow. This configuration is naturally interpreted as a siphon flow along an arched magnetic flux tube.

Original languageEnglish (US)
Article number15
JournalAstrophysical Journal, Supplement Series
Issue number1
StatePublished - Mar 2017


  • Sun: magnetic fields
  • Sun: photosphere
  • methods: observational
  • techniques: polarimetric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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