Superstrong photospheric magnetic fields in sunspot penumbrae

Context. Recently, there have been some reports of unusually strong photospheric magnetic fields (which can reach values of over 7 kG) inferred from Hinode SOT/SP sunspot observations within penumbral regions. These superstrong penumbral fields are even larger than the strongest umbral fields on record and appear to be associated with supersonic downflows. The finding of such fields has been controversial since they seem to show up only when spatially coupled inversions are performed.

Here, we investigate and discuss the reliability of those findings by studying in detail observed spectra associated with particularly strong magnetic fields at the inner edge of the penumbra of active region 10930.

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Copyright 2019 Author(s). This work is licensed under a Creative Commons Attribution 4.0 International license.
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Author Siu-Tapia, A.
Lagg, A.
van Noort, M.
Rempel, Matthias
Solanki, S. K.
Publisher UCAR/NCAR - Library
Publication Date 2019-11-01T00:00:00
Digital Object Identifier (DOI) Not Assigned
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T19:08:09.986474
Metadata Record Identifier edu.ucar.opensky::articles:22992
Metadata Language eng; USA
Suggested Citation Siu-Tapia, A., Lagg, A., van Noort, M., Rempel, Matthias, Solanki, S. K.. (2019). Superstrong photospheric magnetic fields in sunspot penumbrae. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d7st7t04. Accessed 19 June 2025.

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