A Novel Method to Determine Magnetic Fields in low-density Plasma eg Solar Flares Facilitated Through Accidental Degeneracy of Quantum States in Fe 9+

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A Novel Method to Determine Magnetic Fields in low-density Plasma eg Solar Flares Facilitated Through Accidental Degeneracy of Quantum States in Fe 9+

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Publication Article, peer reviewed scientific
Title A Novel Method to Determine Magnetic Fields in low-density Plasma eg Solar Flares Facilitated Through Accidental Degeneracy of Quantum States in Fe 9+
Author(s) Wenxian, Li ; Grumer, Jon ; Yang, Yang ; Brage, Tomas ; Yao, Ke ; Chen, Chongyang ; Watanabe, Tetsuya ; Jönsson, Per ; Lundstedt, Henrik ; Hutton, Roger ; Zou, Yaming
Date 2015
English abstract
We propose a new method to determine magnetic fields, by using the magnetic-field-induced electric dipole transition 3p4 3d 4D 7 2 3p P 5 2  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 3p4 3d 4D 5 2 should be measured experimentally since it is required to determine the relative intensity of this magnetic line for different magnetic fields.
DOI http://dx.doi.org/10.1088/0004-637X/807/1/69 (link to publisher's fulltext)
Publisher IOP
Host/Issue Astophysical Journal;1
Volume 807
ISSN 0004-637X
Pages 69
Language eng (iso)
Subject(s) Sciences
Research Subject Categories::NATURAL SCIENCES
Handle http://hdl.handle.net/2043/19993 (link to this page)

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