Inferring the Structure of the Solar Corona and Inner Heliosphere During the Maunder Minimum Using Global Thermodynamic Magnetohydrodynamic Simulations - Archive ouverte HAL Access content directly
Journal Articles The Astrophysical Journal Year : 2015

Inferring the Structure of the Solar Corona and Inner Heliosphere During the Maunder Minimum Using Global Thermodynamic Magnetohydrodynamic Simulations

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Pete Riley
  • Function : Author
Roberto Lionello
  • Function : Author
Jon A. Linker
  • Function : Author
Ed Cliver
  • Function : Author
Andre Balogh
  • Function : Author
Jürg Beer
  • Function : Author
Paul Charbonneau
  • Function : Author
Nancy Crooker
  • Function : Author
Marc Derosa
  • Function : Author
Mike Lockwood
  • Function : Author
Matt Owens
  • Function : Author
Ken Mccracken
  • Function : Author
Ilya Usoskin
  • Function : Author

Abstract

Observations of the Sun’s corona during the space era have led to a picture of relatively constant, but cyclically varying solar output and structure. Longer-term, more indirect measurements, such as from 10Be, coupled by other albeit less reliable contemporaneous reports, however, suggest periods of significant departure from this standard. The Maunder Minimum was one such epoch where: (1) sunspots effectively disappeared for long intervals during a 70 yr period; (2) eclipse observations suggested the distinct lack of a visible K-corona but possible appearance of the F-corona; (3) reports of aurora were notably reduced; and (4) cosmic ray intensities at Earth were inferred to be substantially higher. Using a global thermodynamic MHD model, we have constructed a range of possible coronal configurations for the Maunder Minimum period and compared their predictions with these limited observational constraints. We conclude that the most likely state of the corona during—at least—the later portion of the Maunder Minimum was not merely that of the 2008/2009 solar minimum, as has been suggested recently, but rather a state devoid of any large-scale structure, driven by a photospheric field composed of only ephemeral regions, and likely substantially reduced in strength. Moreover, we suggest that the Sun evolved from a 2008/2009-like configuration at the start of the Maunder Minimum toward an ephemeral-only configuration by the end of it, supporting a prediction that we may be on the cusp of a new grand solar minimum.

Dates and versions

insu-03644982 , version 1 (19-04-2022)

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Pete Riley, Roberto Lionello, Jon A. Linker, Ed Cliver, Andre Balogh, et al.. Inferring the Structure of the Solar Corona and Inner Heliosphere During the Maunder Minimum Using Global Thermodynamic Magnetohydrodynamic Simulations. The Astrophysical Journal, 2015, 802, ⟨10.1088/0004-637X/802/2/105⟩. ⟨insu-03644982⟩
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