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Vicente-Retortillo, A.; Martínez, G. M.; Rennó, N. O.; Lemmon, M. T.; de la Torre-Juárez, M.; Gómez-Elvira, J.
Space science reviews, 08/2020, Letnik: 216, Številka: 5Journal Article
Measurements by the REMS/UV sensor onboard the MSL Curiosity rover constitute the first in situ dataset of UV radiation flux at the surface of Mars. Due to its position on the Curiosity deck, the UV sensor has been directly exposed to dust deposition. Inaccuracies in the original angular response calibration functions have led to discrepancies between measured and physically-expected UV fluxes when the solar zenith angle ( θ ) relative to the rover frame is between 20 ∘ and 55 ∘ . Here we present a methodology to correct UV fluxes when θ < 55 ∘ for both effects, and show results of the corrected data set for the first 2003 sols (∼3 Martian Years, MY) of the MSL mission, from L ∼ s 151 ∘ in MY 31 to L ∼ s 149 ∘ in MY 34. Close to noon, when θ values are typically < 30 ∘ , relative differences between corrected and original UV fluxes are ∼35 – 40% on average. Outside hours close to noon, when θ is typically > 30 ∘ , relative differences are greater than 100%. Measurements acquired when 20 ∘ < θ < 55 ∘ represent ∼45% of the whole dataset with θ < 90 ∘ . UV fluxes generated in this study are available in the NASA Planetary Data System ( https://atmos.nmsu.edu/PDS/data/mslrem_1001/DATA_UV_CORRECTED/ ), and are important to study the effect of UV radiation on the variability of atmospheric constituents, to recreate accurate UV doses for biological laboratory experiments, to perform combined analyses of satellite and ground-based measurements, and to allow comparisons of the UV radiation environment at different locations with the upcoming ExoMars 2020 and Mars 2020 missions.
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