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

Li, Wenxian ; Grumer, Jon LU ; Yang, Yang ; Brage, Tomas LU ; Yao, Ke ; Chen, Chongyang ; Watanabe, Tetsuya ; Jonsson, Per ; Lundstedt, Henrik and Hutton, Roger (2015) In Astrophysical Journal 807(1).
Abstract
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... (More)
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. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
atomic processes, Sun: corona, Sun: magnetic fields, Sun: UV radiation, techniques: spectroscopic
in
Astrophysical Journal
volume
807
issue
1
article number
69
publisher
American Astronomical Society
external identifiers
  • wos:000358945200069
  • scopus:84935413741
ISSN
0004-637X
DOI
10.1088/0004-637X/807/1/69
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Mathematical Physics (Faculty of Science) (011040001), Physics, science (011013100)
id
9e38103e-fccb-424b-a6ac-a65dc4ccc7ac (old id 7773483)
date added to LUP
2016-04-01 14:50:12
date last changed
2020-12-29 04:44:52
@article{9e38103e-fccb-424b-a6ac-a65dc4ccc7ac,
  abstract     = {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.},
  author       = {Li, Wenxian and Grumer, Jon and Yang, Yang and Brage, Tomas and Yao, Ke and Chen, Chongyang and Watanabe, Tetsuya and Jonsson, Per and Lundstedt, Henrik and Hutton, Roger},
  issn         = {0004-637X},
  language     = {eng},
  number       = {1},
  publisher    = {American Astronomical Society},
  series       = {Astrophysical Journal},
  title        = {A Novel Method to Determine Magnetic Fields in Low-density Plasma Facilitated Through Accidental Degeneracy of Quantum States in Fe9+},
  url          = {http://dx.doi.org/10.1088/0004-637X/807/1/69},
  doi          = {10.1088/0004-637X/807/1/69},
  volume       = {807},
  year         = {2015},
}