New high-resolution solar spectrum in the 0.7-1.7 µm domain obtained with the ACS-NIR spectrometer (TGO).
Résumé
Obtaining the infrared solar spectrum from the ground is difficult outside the observation windows allowed by the Earth's atmosphere. Observations over 10 months with the Near InfraRed (NIR) spectrometer on the Atmospheric Chemistry Suite (ACS) platform of the Trace Gas Orbiter (TGO) mission orbiting MARS were used to overcome this limitation. Indeed, the line of sight of the spectrometer ACS-NIR observing the Sun gradually crosses the atmosphere of MARS as the satellite moves in its orbit. The high-resolution solar spectrum is then directly obtained when the line of sight is above the atmosphere. The main concerns for recovering the solar spectrum is spectral contamination of orders. We first present how we processed the order images to obtain the solar spectrum in the 0.7-1.7 µm band. We show that the use of 3 off-centre images of the same order allows to avoid spectral contamination and to improve the detection of solar lines where the intensity is low in the order image. We then compare the solar spectrum obtained with that of Toon taken as a reference. We end by addressing the parts of the spectrum which present solar lines located in spectral bands not observable from Earth.
Domaines
Planète et Univers [physics]
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New_high_resolution_solar_spectrum_in_the_0_7_1_7_µm_domain_obtained_with_the_ACS_NIR_spectrometer.pdf (3.11 Mo)
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