The infrared Fourier transform spectrometer and the infrared imager instrument concepts for the FORUM mission, ESA's 9th Earth Explorer

Charlotte Pachot; Bernardo Carnicero Dominguez; Hilke Oetjen; Bernd Sierk; Flavio Mariani; Stefanie Riel; Gonçalo Rodrigues; Miguel Copano; Asier Martínez Carou; Luca Palchetti; Magdalena Lippa; Philippe Giaccari; Carmine Mastrandrea; Gaetan Perron; Corneli Keim; Manfred-Georg Kolm

doi:10.1117/12.2570867

20 September 2020 The infrared Fourier transform spectrometer and the infrared imager instrument concepts for the FORUM mission, ESA's 9th Earth Explorer

Charlotte Pachot, Bernardo Carnicero Dominguez, Hilke Oetjen, Bernd Sierk, Flavio Mariani, Stefanie Riel, Gonçalo Rodrigues, Miguel Copano, Asier Martínez Carou, Luca Palchetti, Magdalena Lippa, Philippe Giaccari, Carmine Mastrandrea, Gaetan Perron, Corneli Keim, Manfred-Georg Kolm

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Proceedings Volume 11530, Sensors, Systems, and Next-Generation Satellites XXIV; 115300D (2020) https://doi.org/10.1117/12.2570867
Event: SPIE Remote Sensing, 2020, Online Only

Abstract

The Far-infrared Outgoing Radiation Understanding and Monitoring (FORUM) mission has been selected in September 2019 as the 9th Earth Explorer mission of the European Space Agency. The mission aims to measure the Earth’s Top-Of- Atmosphere (TOA) emission spectrum in the spectral region from 100 to 1600 cm^-¹ (i.e. 6.25 to 100 μm). This will fill the current observational gap from space in the far-infrared region (FIR) from 100 to 667 cm^-¹ (i.e. from 15 to 100 μm). FORUM measurements will improve the understanding of the climate system by providing, for the first time with high resolution, the spectral features of the far-infrared emission of the Earth with a focus on the contribution to the radiation budget of the continuum absorption of the water vapour rotational bands, on cirrus cloud properties, and on ice/snow surface emissivity. The FORUM mission requires a payload able to spectrally-resolve the Earth's outgoing longwave radiation across the Far-InfraRed (FIR) spectral range with high absolute radiometric accuracy. Characterisation of the surface, atmospheric and cloud/surface heterogeneity in the observed field-of-view is also required to help interpret the measured spectral radiance. These needs dictate the use of two instruments: a spectrometer and an infrared imager. The concepts of both instruments, thoroughly studied in phase A preparatory activities by two independent industrial consortia, are presented in this paper.

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Charlotte Pachot, Bernardo Carnicero Dominguez, Hilke Oetjen, Bernd Sierk, Flavio Mariani, Stefanie Riel, Gonçalo Rodrigues, Miguel Copano, Asier Martínez Carou, Luca Palchetti, Magdalena Lippa, Philippe Giaccari, Carmine Mastrandrea, Gaetan Perron, Corneli Keim, and Manfred-Georg Kolm "The infrared Fourier transform spectrometer and the infrared imager instrument concepts for the FORUM mission, ESA's 9th Earth Explorer", Proc. SPIE 11530, Sensors, Systems, and Next-Generation Satellites XXIV, 115300D (20 September 2020); https://doi.org/10.1117/12.2570867

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