Record-breaking Coronal Magnetic Field in Solar Active Region 12673

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 cor...

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Bibliographic Details
Published inAstrophysical journal. Letters Vol. 880; no. 2; p. L29
Main Authors Anfinogentov, Sergey A., Stupishin, Alexey G., Mysh'yakov, Ivan I., Fleishman, Gregory D.
Format Journal Article
LanguageEnglish
Published Austin The American Astronomical Society 01.08.2019
IOP Publishing
Subjects
Corona
Coronal magnetic fields
Magnetic fields
Magnetism
Photosphere
Records & achievements
Solar activity
Solar activity regions
Solar atmosphere
Solar corona
Solar magnetic field
Sun: corona
Sun: magnetic fields
Sun: radio radiation
Sunspots
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Summary: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.
Bibliography:AAS17075
ISSN:2041-8205
2041-8213
DOI:10.3847/2041-8213/ab3042