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EUMETSAT is currently developing the on-ground processing chain of the infrared sounders (IRS) on-board the Meteosat third-generation sounding satellites (MTG-S). In this context, the authors investigated the impact of a particular type of radiometric error, called hereafter calibration ringing. It arises in Fourier transform spectrometers when the instrument's radiometric transfer function (RTF) varies within the domain of the instrument's spectral response function (SRF). The expected radiometric errors were simulated in the context of the MTG-S IRS instrument in the long-wave infrared (LWIR) band. Making use of a principal components (PCs) decomposition, a software correction, called RTF uniformisation, was designed and its performance was assessed in the context of MTG-S IRS. [ABSTRACT FROM AUTHOR]

Abstract: In 2002 Meersseman and Verjovsky constructed a smooth, codimension-one, foliation on 5-sphere by complex surfaces with two compact leaves. The aim of this Note is to improve and simplify their construction in order to give a smooth foliation on 5-sphere by complex surfaces with only one compact leaf. [ABSTRACT FROM AUTHOR]

Abstract: The aim of this Note is to give some applications of twistor theory about existence or non-existence of complex structures. We slightly improve Yau''s result [Topology 15 (1976) 51–53] by giving the full list of compact parallelizable real 4-manifolds with a complex structure. On the other hand, we give a family of parallelizable 4-manifolds without complex structure but whose product with the sphere is complex. To cite this article: G. Deschamps, C. R. Acad. Sci. Paris, Ser. I 341 (2005). [Copyright &y& Elsevier]

We report on the generation and delivery of 10.2 PW peak power laser pulses, using the High Power Laser System at the Extreme Laser Infrastructure – Nuclear Physics facility. In this work we demonstrate for the first time, to the best of our knowledge, the compression and propagation of full energy, full aperture, laser pulses that reach a power level of more than 10 PW. [ABSTRACT FROM AUTHOR]