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Table of contents
1 Introduction
1.1 Titan’s atmosphere
1.1.1 A short tale about an intriguing atmosphere
1.1.2 General description – state of knowledge
1.2 Cassini investigations
1.3 Motivations and focus of the present work
2 UVIS stellar and solar occultation data analysis
2.1 UVIS instrument and data
2.1.1 UVIS instrument
2.1.2 UVIS data
2.1.3 Ancillary data
2.2 Absorptive UV occultations
2.2.1 Atmospheric composition from absorptive VUV stellar occultations
2.2.2 First steps in occultation analysis
2.2.3 Stellar vs. solar occultations
2.3 Stellar occultations measured by UVIS FUV
2.3.1 Introduction to stellar occultations measured in the FUV
2.3.2 UVIS/FUV stellar occultation analysis
2.4 Solar occultations measured by UVIS EUV
2.4.1 Introduction to solar occultations measured in the EUV
2.4.2 UVIS/EUV solar occultation analysis
2.5 Temporal/spatial coverage of data
2.6 Summary of chapter
3 Retrieval methods
3.1 Column density retrieval, stellar occultations
3.2 Column density retrieval, solar occultations
3.3 Altitude range for column densities
3.4 Number density and aerosol extinction retrieval
3.5 Temperature calculations
3.6 Simulations
3.6.1 Choice of Species
3.6.2 Simulation of UVIS data and column density retrieval
3.6.3 Simulation of molecular number density and aerosol extinction retrieval
3.7 Summary of chapter
4 Benzene ACS in the VUV, relevance for Titan
4.1 An Introduction to Benzene on Titan
4.2 Introduction to benzene absorption cross sections
4.3 Experimental measurements of benzene absorption cross section
4.3.1 Absorption measurements with Synchrotron radiation, BESSY II facility
4.3.2 Absorption measurements with a deuterium lamp source, Meudon Observatory facility
4.3.3 Absorption cross section derivation and uncertainties
4.4 Absorption cross section results and interpretation
4.4.1 Temperature variations
4.5 Summary of chapter
5 Atmospheric composition and variability
5.1 Column density and number density profiles
5.1.1 Minor constituents abundance, from FUV stellar occultations
5.1.2 Major constituents abundance, from FUV stellar and EUV solar occultations .
5.2 Temperature and variability
5.3 Summary of chapter
6 Conclusions and further work
Appendices
A Temperature calculations
B MPFIT, dependence of column density retrieval on initial guess
C MPFIT, uncertainties in column density retrieval
