Record-breaking Coronal Magnetic Field in Solar Active Region 12673

Sergey A. Anfinogentov, Alexey G. Stupishin, Ivan I. Mysh'yakov, Gregory D. Fleishman

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


The strongest magnetic fields on the Sun are routinely detected at dark sunspots. The magnitude of the field is typically about 3000 G, with only a few exceptions that reported the magnetic field in excess of 5000 G. Given that the magnetic field decreases with height in the solar atmosphere, no coronal magnetic field above ∼2000 G has ever been reported. Here, we present imaging microwave observations of anomalously strong magnetic field of about 4000 G at the base of the corona in solar active region NOAA 12673 on 2017 September 6. Combining the photospheric vector measurements of the magnetic field and the coronal probing, we created and validated a nonlinear force-free field coronal model, with which we quantify the record-breaking coronal magnetic field at various coronal heights.

Original languageEnglish (US)
Article numberL29
JournalAstrophysical Journal Letters
Issue number2
StatePublished - Aug 1 2019

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Sun: corona
  • Sun: magnetic fields
  • Sun: radio radiation


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