Another high-altitude research aircraft that will be chasing the eclipse and gathering infra-red spectroscopy data will be NSF/NCAR's Gulfstream-V.
Inset below shows Jenna Samra, Smithsonian Astrophysical Observatory scientist, with the Airborne Coronal Emission Surveyor (ACES) instrument onboard the GV.
https://news.ucar.edu/132947/total-eclipse-celestial-wonder-and-scientific-opportunity?sf187561215=1
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