Mapping the Magnetic Field of Flare Coronal Loops

Authors Organisations
  • David Kuridze(Author)
  • M. Mathioudakis(Author)
    Queen's University Belfast
  • Huw Morgan(Author)
  • R. Oliver(Author)
    University of the Balearic Islands
  • L. Kleint(Author)
    University of Applied Sciences and Arts
    Leibniz-Institut für Sonnenphysik (KIS)
  • T. V. Zaqarashvili(Author)
    Abastumani Astrophysical Observatory
    Space Research Institute of the Austrian Academy of Sciences
    University of Graz
  • A. Reid(Author)
    Queen's University Belfast
  • J. Koza(Author)
    Slovak Academy of Sciences
  • M. G. Löfdahl(Author)
    University of Stockholm
  • T. Hillberg(Author)
    University of Stockholm
  • V. Kukhianidze(Author)
    Abastumani Astrophysical Observatory
  • A. Hanslmeier(Author)
    University of Graz
Type Article
Original languageEnglish
Article number126
Pages (from-to)1-12
Number of pages12
JournalAstrophysical Journal
Volume874
Issue number2
Early online date29 Mar 2019
DOI
Publication statusPublished - 01 Apr 2019
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Abstract

Here, we report on the unique observation of flaring coronal loops at the solar limb using high-resolution imaging spectropolarimetry from the Swedish 1 m Solar Telescope. The vantage position, orientation, and nature of the chromospheric material that filled the flare loops allowed us to determine their magnetic field with unprecedented accuracy using the weak-field approximation method. Our analysis reveals coronal magnetic field strengths as high as 350 G at heights up to 25 Mm above the solar limb. These measurements are substantially higher than a number of previous estimates and may have considerable implications for our current understanding of the extended solar atmosphere.

Keywords

  • instrumentation: polarimeters, sun: chromosphere, sun: corona, sun: flares, sun: magnetic fields, techniques: polarimetric

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