The Atmosphere of Callisto

@inproceedings{Yung2004TheAO,
  title={The Atmosphere of Callisto},
  author={Yuk L. Yung and Mao-Chang Liang and Brendan Lane and Robert T. Pappalardo and Mark B. Allen},
  year={2004}
}
During the Galileo flybys of Callisto in 1999, a CO_2 atmosphere and an ionosphere were detected. Using the Caltech/Jet Propulsion Laboratory one-dimensional KINETICS model, we have successfully simulated the observed electron density within a factor of 2, while satisfying the observational constraints on carbon and oxygen atoms. We conclude that photoionization of CO_2 alone is insufficient to produce the observed electron density. An atmosphere 20–100 times denser than the CO_2 atmosphere… Expand

Figures and Tables from this paper

Detection of Callisto’s oxygen atmosphere with the Hubble Space Telescope
Abstract We report the result of a search for evidence of an O 2 -dominated atmosphere on Callisto, using the high far-ultraviolet sensitivity of the Hubble Space Telescope Cosmic OriginsExpand
A tenuous, collisional atmosphere on Callisto
A simulation tool which utilizes parallel processing is developed to describe molecular kinetics in 2D, singleand multi-component atmospheres on Callisto. This expands on our previous study on theExpand
Trace constituents of Europa's atmosphere
Abstract Europa is bombarded by intense radiation that erodes the surface, launching molecules into a thin “atmosphere” representative of surface composition. In addition to atoms and moleculesExpand
Monte-Carlo simulation of Callisto’s exosphere
We model Callisto's exosphere based on its ice as well as non-ice surface via the use of a Monte-Carlo exosphere model. For the ice component we implement two putative compositions that have beenExpand
The influence of Europa's plumes on its atmosphere and ionosphere
Abstract Europa, one of the Galilean satellites, has a tenuous, oxygen-dominated atmosphere that is usually referred to as a collision-less exosphere. Coupled to the neutral atmosphere and in contactExpand
The impact of Callisto's atmosphere on its plasma interaction with the Jovian magnetosphere
The interaction between Callisto's atmosphere and ionosphere with the surrounding magnetospheric environment is analyzed by applying a hybrid simulation code, in which the ions are treated asExpand
Structure and density of Callisto's atmosphere from a fluid-kinetic model of its ionosphere: Comparison with Hubble Space Telescope and Galileo observations
Abstract We develop a model of the ionospheric electron population of Jupiter’s moon Callisto using a prescribed neutral atmosphere composed of O2, CO2 and H2O. A kinetic description of ionosphericExpand
The influence of collisions and thermal escape in Callisto's atmosphere
Abstract A molecular kinetic method is applied to simulate intermolecular collisions and thermal escape in single and multi-component Callisto-like atmospheres. The 1D atmospheres at noon andExpand
Disentangling plasma interaction and induction signatures at Callisto: The Galileo C10 flyby
We apply a combination of data analysis and hybrid modeling to study Callisto's interaction with Jupiter's magnetosphere during the Galileo C10 flyby on 17 September 1997. This encounter took placeExpand
Modeling of ice pinnacle formation on Callisto
Callisto's pinnacle terrain has been interpreted to form through sublimation weathering of bedrock and subsequent deposition of the sublimated ice in local cold traps on peaks and crater rims. ToExpand
...
1
2
3
4
...

References

SHOWING 1-10 OF 72 REFERENCES
Ionosphere of Callisto from Galileo radio occultation observations
heights of 29.6 and 49.0 km. Four different methods, based on both photoionization and electron impact ionization, were used to obtain estimates of the corresponding neutral densities at the surface.Expand
Photochemistry of Saturn's Atmosphere: II. Effects of an Influx of External Oxygen
We use a one-dimensional diurnally averaged model of photochemistry and diffusion in Saturn's stratosphere to investigate the influence of extraplanetary debris on atmospheric chemistry. InExpand
Hubble Space Telescope Space Telescope Imaging Spectrograph Search for an Atmosphere on Callisto: A Jovian Unipolar Inductor
Hubble Space Telescope observations of Callisto with the Space Telescope Imaging Spectrograph were performed at both eastern and western elongations to search for the UV emissions diagnostic of theExpand
Hydrocarbon photochemistry in the upper atmosphere of Jupiter.
TLDR
There is a great need for laboratory measurements of basic reaction rates and photodissociation quantum yields, even for such simple species as methylacetylene and allene, until such laboratory measurements exist there will be considerable uncertainty in the understanding of the C3 and higher hydrocarbons in the atmospheres of the jovian planets. Expand
A tenuous carbon dioxide atmosphere on Jupiter's moon Callisto.
TLDR
An off-limb scan of Callisto was conducted by the Galileo near-infrared mapping spectrometer to search for a carbon dioxide atmosphere, finding either the atmosphere is transient and was formed recently or some process is currently supplying carbon dioxide to the atmosphere. Expand
Detection of an oxygen atmosphere on Jupiter's moon Europa
TLDR
The detection of atomic oxygen emission from Europa is reported, which is interpreted as being produced by the simultaneous dissociation and excitation of atmospheric O2 by electrons from Jupiter's magnetosphere. Expand
The sub-Alfvénic interaction of the Galilean satellites with the Jovian magnetosphere
Recent observations by the Galileo spacecraft and Earth-based techniques have motivated us to reconsider the sub-Alfvenic interaction between the Galilean satellites of Jupiter and the magnetosphere.Expand
The Far-Ultraviolet Oxygen Airglow of Europa and Ganymede
Far-UV spectra of Europa and Ganymede, acquired by the Hubble Space Telescope Goddard High Resolution Spectrograph, indicate that, in addition to faintly reflected sunlight, both satellites emit O IExpand
Urey Prize Lecture. Io's Atmosphere: Not Yet Understood
Abstract The atmosphere of Io has been detected at infrared, millimeter, and ultraviolet wavelengths. The observations indicate a predominantly SO 2 tenuous atmosphere on both the leading andExpand
Galileo ultraviolet spectrometer observations of atomic hydrogen in the atmosphere of Ganymede
Atomic hydrogen Lyman alpha radiation (121.6 nm) has been measured in emission from the atmosphere of Ganymede with the Galileo ultraviolet spectrometer. An exospheric model with the followingExpand
...
1
2
3
4
5
...