Discovery of new coronal lines at 2.843 and 2.853 μm

Two new emission features were observed during the 2017 August 21 total solar eclipse by a novel spectrometer, the Airborne Infrared Spectrometer (AIR-Spec), flown at 14.3 km altitude aboard the NCAR Gulfstream-V aircraft. We derive wavelengths in air of 2.8427 +/- 0.00009 mu m and 2.8529 +/- 0.00008 mu m. One of these lines belongs to the 3p(5)3d F-3(3)degrees -> 3p(5)3d F-3(4)degrees transition in Ar-like Fe IX. This appears to be the first detection of this transition from any source. Minimization of residual wavelength differences using both measured wavelengths, together with National Institute of Standards and Technology (NIST) extreme ultraviolet wavelengths, does not clearly favor assignment to Fe IX. However, the shorter wavelength line appears more consistent with other observed features formed at similar temperatures to Fe IX. The transition occurs between two levels within the excited 3p(5)3d configuration, 429,000 cm(-1) above the ground level. The line is therefore absent in photo-ionized coronal-line astrophysical sources such as the Circinus Galaxy. Data from a Fourier transform interferometer (FTIR) deployed from Wyoming show that both lines are significantly attenuated by telluric H2O, even at dry sites. We have been unable to identify the longer wavelength transition.

To Access Resource:

Questions? Email Resource Support Contact:

    UCAR/NCAR - Library

Resource Type publication
Temporal Range Begin N/A
Temporal Range End N/A
Temporal Resolution N/A
Bounding Box North Lat N/A
Bounding Box South Lat N/A
Bounding Box West Long N/A
Bounding Box East Long N/A
Spatial Representation N/A
Spatial Resolution N/A
Related Links N/A
Additional Information N/A
Resource Format PDF
Standardized Resource Format PDF
Asset Size N/A
Legal Constraints

Copyright 2018 The American Astronomical Society.

Access Constraints None
Software Implementation Language N/A

Resource Support Name N/A
Resource Support Email
Resource Support Organization UCAR/NCAR - Library
Distributor N/A
Metadata Contact Name N/A
Metadata Contact Email
Metadata Contact Organization UCAR/NCAR - Library

Author Samra, Jenna E.
Judge, Philip G.
DeLuca, Edward E.
Hannigan, James W.
Publisher UCAR/NCAR - Library
Publication Date 2018-04-01T00:00:00
Digital Object Identifier (DOI) Not Assigned
Alternate Identifier N/A
Resource Version N/A
Topic Category geoscientificInformation
Progress N/A
Metadata Date 2023-08-18T19:18:37.140322
Metadata Record Identifier edu.ucar.opensky::articles:21547
Metadata Language eng; USA
Suggested Citation Samra, Jenna E., Judge, Philip G., DeLuca, Edward E., Hannigan, James W.. (2018). Discovery of new coronal lines at 2.843 and 2.853 μm. UCAR/NCAR - Library. Accessed 18 June 2024.

Harvest Source