Alexandra Tsekeri¹, Anna Gialitaki^1,2, Josef Gasteiger³, Natalia Kustova⁴, Alexander Konoshonkin⁴, Maxim Yurkin⁵, Thanasis Georgiou^6,7, Anna Kampouri⁶, Maria Tsichla⁶, Spiros Metallinos⁶, Niki Asimakopoulou⁶, Eleni Marinou⁶, Maria Kezoudi⁸, Franco Marenco⁸, Alkistis Papetta⁸, Aryasree Sudharaj⁹, Konrad Kandler⁹, Moritz Haarig¹⁰, Athina Floutsi¹⁰, Holger Baars¹⁰, Amin R Nehrir¹¹, James E Collins Jr¹¹, Ewan Crosbie¹¹, Rory Alistair Barton-Grimley¹¹, Edward P Nowottnick¹², Silke Gross¹³ and Vassilis Amiridis¹, (1)National Observatory of Athens, Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, Athens, Greece, (2)University of Leicester, School of Physics and Astronomy, Earth Observation Science Group, Leicester, United Kingdom, (3)Hamtec Consulting GmbH at EUMETSAT, Darmstadt, Germany, (4)V. E. Zuev Institute of Atmospheric Optics SB RAS, Tomsk, Russia, (5)Université Rouen Normandie, INSA Rouen Normandie, CNRS, Rouen, France, (6)National Observatory of Athens, IAASARS, Athens, Greece, (7)Aristotle University of Thessaloniki, Physics Department, Thessaloniki, Greece, (8)Cyprus Institute, Nicosia, Cyprus, (9)Technical University of Darmstadt, Institute of Applied Geosciences, Darmstadt, Germany, (10)Leibniz Institute for Tropospheric Research, Leipzig, Germany, (11)NASA Langley Research Center, Hampton, United States, (12)NASA Goddard Space Flight Center, Greenbelt, United States, (13)German Aerospace Center Oberpfaffenhofen, Oberpfaffenhofen, Germany