The Airborne Infrared Spectrometer (AIR-Spec) was commissioned during the 2017 total solar eclipse, when it observed five infrared coronal emission lines from a Gulfstream V research jet owned by the National Science Foundation and operated by the National Center for Atmospheric Research. The second AIR-Spec research flight took place during the 2019 July 2 total solar eclipse across the south Pacific. The 2019 eclipse flight resulted in seven minutes of observations, during which the instrument measured all four of its target emission lines: S
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Abstract xi 1.393μ m, Six 1.431μ m, Sxi 1.921μ m, and Feix 2.853μ m. The 1.393μ m Sxi line was detected for the first time, and probable first detections were made of Sixi 1.934μ m and Fex 1.947μ m. The 2017 AIR-Spec detection of Feix was confirmed and the first observations were made of the Feix line intensity as a function of solar radius. Telluric absorption features were used to calibrate the wavelength mapping, instrumental broadening, and throughput of the instrument. AIR-Spec underwent significant upgrades in preparation for the 2019 eclipse observation. The thermal background was reduced by a factor of 30, providing a 5.5× improvement in signal-to-noise ratio, and the postprocessed pointing stability was improved by a factor of 5 to <10″ rms. In addition, two imaging artifacts were identified and resolved, improving the spectral resolution and making the 2019 data easier to interpret. -
Gilbert, Emily A. ; Barclay, Thomas ; Schlieder, Joshua E. ; Quintana, Elisa V. ; Hord, Benjamin J. ; Kostov, Veselin B. ; Lopez, Eric D. ; Rowe, Jason F. ; Hoffman, Kelsey ; Walkowicz, Lucianne M. ; et al ( , The Astronomical Journal)null (Ed.)