Emitted Power of Saturn Based on Cassini/CIRS Observations

Details Emitted Power of Saturn Based on Cassini/CIRS Observations Emitted Power of Saturn Based on Cassini/CIRS Observations

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p32c..03l&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P32C-03

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[5704] Planetary Sciences: Fluid Planets / Atmospheres, [5739] Planetary Sciences: Fluid Planets / Meteorology, [6275] Planetary Sciences: Solar System Objects / Saturn

Scientific paper

We are evaluating the energy balance of Saturn through Cassini observations, utilizing in particular CIRS observations from 7 to 500 micron and ISS/VIMS observations from 0.25 to 5.1 micron. The CIRS observations are utilized to compute the emitted power of Saturn between 2004 and 2009. Compared with the Voyagers' results, Cassini’s observations display significant variations in the global emitted power between the Voyager epoch (1979-1982) and the current Cassini time period (2004-2009). In addition, the meridional distribution of emitted power measured by Cassini shows that the emitted power is ~20% higher in the southern hemisphere than in the northern hemisphere. This is different from the Voyager results, which showed the two hemispheres to be roughly equal in emitted power. It is unclear whether the differences between the Voyager and Cassini epochs are due to the seasonal or inter-annual variations or both, but the time variations from 2004 to 2009 suggest that seasonal variations are at least part of the reason. The Cassini Equinox and Solstice Extended missions will continue to provide more knowledge of the seasonal/inter-annual variations of the emitted power. The computation of the reflected solar power by fitting Minnaert coefficient/Barkstrom model for each latitude bin or by directly utilizing the observed reflected radiance at each pixel of the globe is still in process. Combining the emitted power and the reflected solar power, we will estimate the energy balance of Saturn and its meridional distribution and seasonal/inter- annual variability.

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