منابع مشابه
Saturn: atmosphere, ionosphere, and magnetosphere.
The Cassini spacecraft has been in orbit around Saturn since 30 June 2004, yielding a wealth of data about the Saturn system. This review focuses on the atmosphere and magnetosphere and briefly outlines the state of our knowledge after the Cassini prime mission. The mission has addressed a host of fundamental questions: What processes control the physics, chemistry, and dynamics of the atmosphe...
متن کاملUpper Atmosphere and Ionosphere of Saturn
This chapter summarizes our current understanding of the upper atmosphere and ionosphere of Saturn. We summarize the available observations and the various relevant models associated with these regions. We describe what is currently known, outline any controversies and indicate how future observations can help in advancing our understanding of the various controlling physical and chemical proce...
متن کاملThe Structure of the Upper Atmosphere of Saturn
Introduction: Knowledge of the structure and composition of the upper atmosphere of the giant planets is critical to a better understanding of thermospheric heat sources, radiative transport, methane photochemistry, and chemical-dynamical balance in the atmospheres of these planets, as well as being critical for planning future missions that involve deep atmospheric probes or aerobraking. Altho...
متن کاملStellar Occultation Saturn ' s Upper Observations of Atmosphere
We have analyzed three stellar occultation observations of Saturn's upper atmosphere during the years 1989 to 1995. These occultations probed the stratosphere at pressure levels about 0.5 to 20 pbars, intermediate to those probed by the Pioneer 11, Voyager I and II radio and ultraviolet occultations. The time span of the earlier occultations and the observation of a higher latitude occultation ...
متن کاملChemical Constraints on the Water and Total Oxygen Abundances in the Deep Atmosphere of Saturn
Thermochemical equilibrium and kinetic calculations for the trace gases CO, PH3, and SiH4 give three independent constraints on the water and total oxygen abundances of Saturn’s deep atmosphere. A lower limit to the water abundance of H2O/H2≥ (1.7 −0.4)×10 is given by CO chemistry while an upper limit of H2O/H2 ≤ (5.5 −2.5)×10 is given by PH3 chemistry. A combination of the CO and PH3 constrain...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1974
ISSN: 0074-1809
DOI: 10.1017/s0074180900025687