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SCIAMACHY Instrument Status - from 2009 to 2013

Manfred Gottwald(1), Eckhart Krieg(1), Günter Lichtenberg(1), Stefan Noel(2), Klaus Bramstedt(2), Heinrich Bovensmann(2) and Ralph Snel(3)

(1) German Aerospace Center (DLR), Oberpfaffenhofen, 82234 Wessling, Germany
(2) IUP/IFE, University of Bremen, 28359 Bremen, Germany
(3) SRON, Sorbonnelaan 2, 3584 CA Utrecht, Netherlands

Abstract

The Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) on-board ENVISAT is successfully operating since its launch in 2002. By preparing ENVISAT’s mission extension until 2013 the originally specified in-orbit lifetime of SCIAMACHY will be more than doubled and will provide for a long continuous set of excellent measurement data.

Two aspects impact SCIAMACHY’s in-orbit performance during the mission extension. In 2010 the ENVISAT orbit altitude will be reduced and fuel consuming inclination maintenance manoeuvres will be stopped. Because the line-of-sight during nadir, limb and solar and lunar measurements is orbit dependent, a careful analysis has to establish the necessary on-board changes. This analysis not only has to address modified scanner viewing angles but also potential adaption of state and timeline durations as well as adjustment of the unique limb/nadir matching technique. Additionally instrument degradation may require appropriate countermeasures. On system side this affects thermal subsystems and life limited items. Particular attention deserves the scanner mechanisms.

This presentation describes the current instrument status and its evolution until 2013. Together with the paper on the optical degradation of SCIAMACHY (see Bramstedt et al. at this conference) it provides a complete picture of SCIAMACHY’s actual in-orbit performance.