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Treatment and analysis of spectroscopic infrared data from observations of Saturn's and Titan's atmospheres by Cassini
2005 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Since July 2004, the spacecraft Cassini has been in orbit around Saturn on a multiple year mission to investigate the Saturnian system. The instrument CIRS on the orbiter scans for infrared light that is emitted from the atmospheres on Saturn and Titan, in order to find the neccessary information to retrieve temperature and mixing ratio profiles. The timelines for the observations are carefully planned since there are different scan modes and a trade-off between the spatial and the spectral resolutions. Retrieving the temperature and mixing ratio profiles is done by performing an inverse solution of the radiative-transfer equation. The parameters may be retrieved at specific altitudes in the atmosphere, due to a correlation between frequency and pressure level for each molecule. An iteration method is used to merge the calculated data with the observed data, where the correct parameters are retrieved. A part of this thesis was to create an interface written in IDL, which could quickly display data from several locations at the same time.With the help partly of this program, early observations from the first months of the mission have been analysed, and discussed in this report.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Cassini, Saturn, Titan, atmospheric spectroscopy, Composite, Infrared Spectrometer, radiative-transfer equation, temperature retrieval, volume mixing ratio retrieval, plotting
Keyword [sv]
URN: urn:nbn:se:ltu:diva-51968ISRN: LTU-EX--05/332--SELocal ID: 92146402-c8da-43de-a79e-1311bb8d7e8fOAI: diva2:1025334
Subject / course
Student thesis, at least 30 credits
Educational program
Space Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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