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A Novel Method to Determine Magnetic Fields in Low-density Plasma Facilitated Through Accidental Degeneracy of Quantum States in Fe9+

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Author

  • Wenxian Li
  • Jon Grumer
  • Yang Yang
  • Tomas Brage
  • Ke Yao
  • Chongyang Chen
  • Tetsuya Watanabe
  • Per Jonsson
  • Henrik Lundstedt
  • Roger Hutton

Summary, in English

We propose a new method to determine magnetic fields, by using the magnetic-field-induced electric dipole transition 3p(4) 3d D-4(7/2) -> 3p(5) P-3/2 in Fe9+ ions. This ion has a high abundance in astrophysical plasma and is therefore well suited for direct measurements of even rather weak fields in, e.g., solar flares. This transition is induced by an external magnetic field and its rate is proportional to the square of the magnetic field strength. We present theoretical values for what we will label the reduced rate and propose that the critical energy difference between the upper level in this transition and the close-to-degenerate 3p(4) 3d D-4(5/2) should be measured experimentally since it is required to determine the relative intensity of this magnetic line for different magnetic fields.

Publishing year

2015

Language

English

Publication/Series

Astrophysical Journal

Volume

807

Issue

1

Document type

Journal article

Publisher

American Astronomical Society

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • atomic processes
  • Sun: corona
  • Sun: magnetic fields
  • Sun: UV radiation
  • techniques: spectroscopic

Status

Published

ISBN/ISSN/Other

  • ISSN: 0004-637X