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DPS Meeting Oct 8 2010
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DPS Meeting Oct 8 2010 Tholins in the Upper Atmosphere of Titan Yuk Yung (Caltech) X. Zhang (Caltech) M. C. Liang (Academia Sinica, Taiwan) D. E. Shemansky (Space Environment Technologies) P36.08 Vertical Structure Of The Titan Atmosphere From Cassini UVIS Observations P11.11 Aerosol Heating in the Stratosphere of Jupiter
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Tholins in the Upper Atmosphere of Titan Yuk Yung (Caltech ) X . Zhang (Caltech) M . C. Liang ( Academia Sinica , Taiwan) D. E. Shemansky (Space Environment Technologies ). DPS Meeting Oct 8 2010. - PowerPoint PPT Presentation
Transcript of DPS Meeting Oct 8 2010
DPS Meeting Oct 8 2010
Tholins in the Upper Atmosphere of TitanYuk Yung (Caltech)X. Zhang (Caltech)M. C. Liang (Academia Sinica, Taiwan)D. E. Shemansky (Space Environment Technologies)
P36.08 Vertical Structure Of The Titan Atmosphere From Cassini UVIS ObservationsP11.11 Aerosol Heating in the Stratosphere of Jupiter
Lorenz + Mitton 2002
Solar Scattering
Stellar Occultation
J. Ajello
UVIS spectrum
Liang et al. 2007
tholin
CH4
Impact: 514 km
Stellar Occultation
• Calibration
• Scattered light : Shemansky et al. 2009
• Calibration : 3-15-02 Rept by UVIS Team
Qe =−4xI (m2 −1m2 + 2
)
Qs =83x4 m2 −1
m2 + 2
2
x =2πrλ Single Scattering Albedo
(SSA):
SSA = Qs/Qe
Important Parameters
Goody and Yung 1989
Obs: 0.118
16 nm
Mie code calculationRefractive Index from Khare and Sagan (1984)
SSA at 1875 Å
Shemansky et al. 2010
. 2Trainer, et al 2006
Tomasko et al. 2008: ~100 km 50 nm radius 3000 monmers
Comparisons
• Tholin Radius at 1040 km: 16 nm Liang et al. (2007) “guessed” 12.5
nm from Stellar Occultation only
• Comparable to 25 nm (in radius) from Trainer et al. (2006)
• Source of monomers at ~100 km from Tomasko et al. (2008)
Summary
Thanks
• Cassini UVIS (PI Esposito)
• PATM (Phil Crane)
• OPR (Curt Niebur)
