Producing Exo atmospheric Fiduciary Reference Measurements of Lunar Spectral Irradiance from the Airborne Lunar Spectral Irradiance (air LUSI) March 2022 Flight Campaign

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dc.contributor.authorWoodward, John
dc.contributor.authorMaxwell, Stephen
dc.contributor.authorLarason, Thomas
dc.contributor.authorGrantham, Steven
dc.contributor.authorStone, Tom
dc.contributor.authorTurpie, Kevin
dc.contributor.authorGadsden, S. Andrew
dc.contributor.authorNewton, Andrew
dc.date.accessioned2023-09-05T19:04:02Z
dc.date.available2023-09-05T19:04:02Z
dc.date.issued2023-06-12
dc.description2023 CALCON Technical Meeting; North Logan, UT; June 10 – 13, 2024en_US
dc.description.abstractIn March of 2022 air-LUSI made four flights aboard a NASA ER-2 high-altitude aircraft and measured the lunar spectral irradiance from above ~95% of the Earth’s atmosphere. Measurements were made at lunar phases of -60.3°, -37.0°, -25.0° and -12.9° with a flight scheduled for -48.8° canceled due to high winds. The measurements are traceable to the SI through artifacts calibrated at NIST and used to calibrate air-LUSI while on the aircraft. An LED-based monitoring system then verifies the calibration during flight. In addition to calibration, both the transfer spectrograph and the air-LUSI instrument were characterized for their linearity and change in response with temperature. A tunable laser was used to measure their bandpass and correct for stray light. We will discuss the calibration approach and the measurement chain that establishes the SI-traceability of these measurements. A pipeline developed in Python incorporates the characterization results with measurements taken at each stage of the calibration chain to obtain a series of at-sensor lunar irradiances for each flight. To achieve top-of-the atmosphere (TOA) irradiance the flight telemetry data was used to correct for the residual atmospheric losses using MODTRAN. The spectra were normalized to a single time point using the ROLO model to correct for the relative change in lunar irradiance during forty minutes of data collection. The result is an SI-traceable TOA lunar spectrum for each flight. Our approach to developing an uncertainty budget will also be discussed.en_US
dc.description.urihttps://digitalcommons.usu.edu/calcon/calcon2023/All2023Content/3/en_US
dc.format.extent27 slidesen_US
dc.genrepresentations (communicative events)en_US
dc.identifierdoi:10.13016/m2xu2t-9gxx
dc.identifier.urihttp://hdl.handle.net/11603/29539
dc.language.isoen_USen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC GESTAR II Collection
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology (JCET)
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.en_US
dc.rightsPublic Domain Mark 1.0*
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleProducing Exo atmospheric Fiduciary Reference Measurements of Lunar Spectral Irradiance from the Airborne Lunar Spectral Irradiance (air LUSI) March 2022 Flight Campaignen_US
dc.typeImageen_US
dcterms.creatorhttps://orcid.org/0000-0002-1637-6008en_US

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