Data · dataset · 2026
Discovery of new coronal lines at 2.843 and 2.853 μm
Listed in National Center for Atmospheric Research
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.
Description
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.
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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.
Links
Get the data
- Publisher page n2t.org/ark:/85065/d7kw5jq9 ↗
documentation · download · from data ucar edu
Where it is published
- data.ucar.edu /dataset/discovery-of-new-coronal-lines-at-2-843-and-2-853-im ↗
National Center for Atmospheric Research dataset page
landing page · from data ucar edu
Catalogue records · 1
- CKAN API data.ucar.edu/api/3/action/package_show?id=41195f4f-a436-42e5-a789-f92bd9355… ↗
metadata API · from data ucar edu
Topics
- From keywords
- Earth & Environmental Science · Ocean & Atmospheric Science
Provenance · 1 source records, 7 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| National Center for Atmospheric Research | 41195f4f-a436-42e5-a789-f92bd93551e9 | 13 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| concepts[field].local:field:earth-environmental | mapping · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| concepts[field].local:field:ocean-atmospheric | mapping · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| created_date | source · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| description | source · data ucar edu | connector:data_ucar_edu@1.0.0 | /notes |
| publication_date | source · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| title | source · data ucar edu | connector:data_ucar_edu@1.0.0 | /title |
| updated_date | source · data ucar edu | connector:data_ucar_edu@1.0.0 |