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Title: Low-density laboratory spectra near the He ii λ304 line

Journal Article · · Astronomy and Astrophysics
 [1];  [2];  [3];  [3]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physics Division, Physical and Life Sciences; Astronomisches Institut, Fakultat fur Physik und Astronomie, Ruhr-Universitat Bochum (Germany)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physics Division, Physical and Life Sciences
  3. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
+ Show Author Affiliations

Aims. Our aim is to interpret the EUV spectra of the solar corona, one hopes for laboratory data of specific chemical elements obtained under coronal conditions. Methods. EUV spectra of He, C, N, O, F, Ne, S, Ar, Fe, and Ni in a 40 Å wide wavelength interval near λ304 were excited in an electron beam ion trap. Results. We observe some two hundred lines about half of which are not yet identified and included in spectral models. Conclusions. Lastly, our data provide a check on the atomic data bases underlying the spectral models that are used to interpret solar corona data. However, a multitude of mostly weak additional lines taken together represent a flux that is comparable to that of various primary lines.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1408080
Report Number(s):
LLNL-JRNL-679682
Journal Information:
Astronomy and Astrophysics, Vol. 586; ISSN 0004-6361
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

References (29)

Extended-range grazing-incidence spectrometer for high-resolution extreme ultraviolet measurements on an electron beam ion trap journal November 2014
Spectral lines observed in solar flares between 171 and 630 angstroms journal April 1978
High-Resolution Laboratory Measurements of Coronal Lines in the 198-218 Å Region journal May 2014
HIGH-RESOLUTION LABORATORY SPECTRA OF THE λ193 CHANNEL OF THE ATMOSPHERIC IMAGING ASSEMBLY INSTRUMENT ON BOARD SOLAR DYNAMICS OBSERVATORY journal October 2014
Thermochemical Data on Gas Phase Compounds of Sulfur, Fluorine, Oxygen, and Hydrogen Related to Pyrolysis and Oxidation of Sulfur Hexafluoride journal January 1987
CHIANTI – an atomic database for emission lines: IX. Ionization rates, recombination rates, ionization equilibria for the elements hydrogen through zinc and updated atomic data journal March 2009
Emission lines of iron in the 150–250 Å region on National Spherical Torus Experiment journal September 2013
Indirect x-ray line formation processes in highly charged barium journal October 1990
Analysis of a Solar Coronal Bright Point Extreme Ultraviolet Spectrum from the EUNIS Sounding Rocket Instrument journal April 2008
ON THE NATURE OF PROMINENCE EMISSION OBSERVED BY SDO /AIA journal July 2012
Laboratory X-Ray Astrophysics journal September 2003
MEASUREMENT OF THE Fe VIII–Fe XVI 3–3 EMISSION IN THE EXTREME ULTRAVIOLET AND COMPARISON WITH CHIANTI journal July 2012
CHIANTI - an atomic database for emission lines: I. Wavelengths greater than 50 Å journal October 1997
HIGH-RESOLUTION LABORATORY SPECTRA ON THE λ131 CHANNEL OF THE AIA INSTRUMENT ON BOARD THE SOLAR DYNAMICS OBSERVATORY journal February 2014
High-resolution time-resolved extreme ultraviolet spectroscopy on NSTX journal October 2012
Spectroscopy in the extreme ultraviolet on an electron beam ion trap journal January 1999
Emission Lines of Fe vii –Fe x in the Extreme Ultraviolet Region, 60–140 A journal October 2002
CHIANTI – An atomic database for emission lines. Version 8 journal October 2015
Extreme Ultraviolet Variability Experiment (EVE) on the Solar Dynamics Observatory (SDO): Overview of Science Objectives, Instrument Design, Data Products, and Model Developments journal January 2010
Chianti—An Atomic Database for Emission Lines. Xiii. soft X-Ray Improvements and Other Changes journal January 2013
Experimental M1 Transition Rates of Coronal Lines from Ar x , Ar xiv , and Ar xv journal September 2000
The Solar Dynamics Observatory (SDO) journal October 2011
Experimental and Theoretical Evaluation of Density‐sensitive N vi , Ar xiv , and Fe xxii Line Ratios journal August 2004
Comparisons of laboratory wavelength measurements with theoretical calculations for neon-like through lithium-like argon, sulfur and silicon
  • Lepson, J. K.; Beiersdorfer, P.; Behar, E.
  • Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 235, Issue 1-4 https://doi.org/10.1016/j.nimb.2005.03.159
journal July 2005
Observation of Quasi-Continuum Line Emission from F[CLC]e[/CLC] [CSC]vii[/CSC] to F[CLC]e[/CLC] [CSC]x[/CSC] in the Extreme-Ultraviolet Region below 140 Å journal July 1999
Chianti—An Atomic Database for Emission Lines. xii. Version 7 of the Database journal December 2011
SDO/AIA response to coronal hole, quiet Sun, active region, and flare plasma journal October 2010
EUNIS: a solar EUV normal-incidence spectrometer conference December 2001
EUV spectroscopy on NSTX journal July 2010

Cited By (5)

Solar UV and X-ray spectral diagnostics journal August 2018
Low-density laboratory spectra near the λ 335 channel of the SDO/AIA instrument journal September 2018
Electron-density-sensitive Line Ratios of Fe xiii– xvi from Laboratory Sources Compared to CHIANTI journal February 2018
High-resolution Laboratory Measurements of Coronal Lines near the Fe ix Line at 171 Å journal February 2018
Solar UV and X-Ray Spectral Diagnostics text January 2018

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Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
79 ASTRONOMY AND ASTROPHYSICS
Sun: corona
atomic data
methods: laboratory: atomic
techniques: spectroscopic
Sun: UV radiation