Roger Yelle

KMap

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Professor Yelle studies the atmospheres in our solar system and the atmospheres of extra-solar planets. He analyzes telescopic and spacecraft data and constructs theories and models to determine the composition and structure of atmospheres and their interaction with surfaces and interplanetary space. Current projects include the study of chemical, thermal and dynamical processes in Titan’s upper atmosphere using primarily data from the Cassini mission to the Saturn system, escape processes on Titan, Mars, and extra-solar planets, and the composition and chemistry of the martian atmosphere. Yelle is a member of the Cassini Ion Neutral Mass Spectrometer Team and a co-I on the planned Maven mission to study the upper atmosphere of Mars.

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Courses

TSP
The Science and Politics of Global Warming
PC
Planetary Climate
TUH
The Universe and Humanity: Origin and Destiny
OGA
Our Golden Age of Planetary Exploration
CSS
Chemistry of the Solar System
PSS
Physics of the Solar System

ARS
Atmospheres and Remote Sensing

Student Thesis/Dissertation

Modelling Electrodynamics in Saturn's Upper Atmosphere
2021
doctoral
Carbon Photochemistry and Escape in the Present-Day Martian Atmosphere
2021
doctoral

Martian Upper Atmospheric Thermal Structure, Composition, and Water and their Significance for Atmospheric Escape and Evolution
2021
doctoral

Grants

Atmospheric Structure and Escape on Pluto
Co-Investigator (COI)
2018
$244.9K
Active
MAVEN Extended Phase E Mission
Principal Investigator (PI)
2011
$2.4M
Active
Anisotropic Magnetohydrodynamics and Resistive Heating in Saturn's Ionosphere (Student: Jess Vriesema)
Principal Investigator (PI)
2016
$120.0K
Saturn UV Airglow
Principal Investigator (PI)
2015
$338.3K
Physical Studies of Extra-Solar Planet Upper Atmospheres
Principal Investigator (PI)
2012
$456.8K
Investigations of Titan's Agnostosphere
Principal Investigator (PI)
2011
$339.1K
Cassini INMS Solstice Mission
Principal Investigator (PI)
2010
$713.5K
Titan Atmosphere Models Working Group (TAMWG)-Cassini-Solstice
Principal Investigator (PI)
2010
$351.0K
THE DISTRIBUTION OF O2 ON MARS FROM SPICAM OCCULATIONS
Principal Investigator (PI)
2009
$557.8K

Dynamics, Chemistry, and Escape of Titan's Atmosphere
Principal Investigator (PI)
2009
$434.3K

News

Escape from Mars: How Water Fled the Red Planet
2020
How Mars Lost Its Atmosphere and Became a Frigid Desert
2017
Comet's Close Encounter 'One in a Million'
2014
Cassini Sees Titan Cooking Up Smog
2013
Titan’s Haze May Hold Ingredients for Life
2010
UA's Cassini Scientists Relieved, Elated at Spacecraft Entry Into Orbit
2004
LPL Scientists Take New Pictures of Saturn with Hubble and Cassini
2004
UA's Cassini Scientists at First Close Titan Flyby
2004
Oct. 16 Public Program - 'Saturn: The Real Lord of the Rings II'
2004
Huygens Scientists Hold Final Science Meeting at UA
2004
UA Scientists Prepare for Huygens Descent on Titan
2004
Cassini Captures Jupiter Close Up Portrait
2003
Cassini Imaging Results on Jupiter Fly-by Reported in March 7 Science
2003
Cassini Spacecraft Camera Sights Saturn
2002
Cassini Spacecraft Camera Sights Saturn
2002
Flandrau Hosts Saturn Viewing Event
2002

Geminid Meteor Shower Best After Moonset
2002

Publications (291)

Recent

Monitoring Ozone and Aerosol in the Martian Mesosphere from MAVEN/IUVS Stellar Occultation Observations between MY 32 and 36
2022
Neutral Composition and Horizontal Variations of the Martian Upper Atmosphere From MAVEN NGIMS
2022
Fully-Coupled Photochemical Modeling of the Deuterated Ionosphere and Non-Thermal Escape of D
2022
Thermal Structure of the Martian Upper Mesosphere/Lower Thermosphere From MAVEN/IUVS Stellar Occultations
2022
Isotope Ratios in the Martian Upper Atmosphere Measured by MAVEN NGIMS
2022
Seasonal and longitudinal variations in ozone and aerosol vertical distribution on Mars from MAVEN/IUVS
2022
Energy deposition in Saturn's equatorial upper atmosphere
2022
Compositional Measurements of Saturn's Upper Atmosphere and Rings From Cassini INMS: An Extended Analysis of Measurements From Cassini's Grand Finale Orbits
2022
MAVEN/IUVS observations of C I 156.1 nm and 165.7 nm dayglow: Direct detection of carbon and implications on photochemical escape
2022
Transport and Escape of Water: Toward a More Complete Interpretation with TGO NOMAD and MAVEN NGIMS
2022
Diurnal Variations in the Martian Atmosphere from Enhanced MAVEN/IUVS Stellar Occultation Dataset
2022
Photochemical escape from Mars as constrained by MAVEN in situ measurements and recent modeling
2021
Carbon photochemical escape rates from the modern Mars atmosphere
2021
Titan occultations of Orion's belt observed with Cassini/UVIS
2021
Water and its isotopologues mesospheric distributions at the Venus terminator as measured by SOIR/VEx
2021
Unexpected Enhancement of Ion Temperatures in Mars' Lower Ionosphere
2021
In-Situ Measurements of Electron Temperature and Density in Mars' Dayside Ionosphere
2021
In Situ Measurements of Thermal Ion Temperature in the Martian Ionosphere
2021
Mars in the Ultraviolet: Highlights from nearly) Six Years of Observations by the MAVEN Imaging UltraViolet Spectrograph
2021
Determination of the Venus eddy diffusion profile from CO and CO$2$ profiles using SOIR/Venus Express observations
2021
A Warm Layer in the Nightside Mesosphere of Mars
2020
Photoelectrons as a Tracer of Planetary Atmospheric Composition: Application to CO on Mars
2020
Vertical Propagation of Wave Perturbations in the Middle Atmosphere on Mars by MAVEN/IUVS
2020
Saturn in Lyman ensuremath{alpha} A comparison of Cassini and Voyager observations
2020
Compositional Measurements of Saturn's Upper Atmosphere and Rings from Cassini INMS
2020
Electrodynamics in Saturn's thermosphere at low and middle latitudes
2020
Subsolar Electron Temperatures in the Lower Martian Ionosphere
2020
Carbon photochemistry at Mars: Updates with recent data
2020
Two-dimensional model for the martian exosphere: Applications to hydrogen and deuterium Lyman ensuremath{alpha} observations
2020
Atmospheric Escape from Mars: Lessons for Studies of Exoplanets
2020
Corrigendum to Saturn in Lyman ensuremath{alpha} A comparison of Cassini and Voyager observations' Icarus 339 2020) 113594]
2020
Hydrogen escape from Mars is driven by seasonal and dust storm transport of water
2020
Transport of Water to the Martian Upper Atmosphere amid Regional and Global Dust Storms
2019
Study of the hydrogen escape rate at Mars during Martian years 28 and 29 from comparisons between SPICAM/Mars Express observations and GCM-LMD simulations
2019
Seasonal variations of N2/CO2 at 140 km altitude derived from MAVEN/IUVS
2019
No detection of methane on Mars from early ExoMars Trace Gas Orbiter observations
2019
Solar System Ice Giants: Exoplanets in our Backyard.
2019
The Morphology of the Topside Martian Ionosphere: Implications on Bulk Ion Flow
2019
Martian dust storm impact on atmospheric H$2$O and D/H observed by ExoMars Trace Gas Orbiter
2019
Evaluating Local Ionization Balance in the Nightside Martian Upper Atmosphere during MAVEN DeeDiCampaigns
2019
Investigating the Interactions between Saturn's Upper Atmosphere and Rings from Cassini INMS Measurements
2019
Latitudinal variations in Titan's atmosphere: UVIS observations of three simultaneous stellar occultations
2019
The D/H Ratio in the Martian Upper Atmosphere
2019
Photochemical Escape from Mars as a Climate Driver: How Important?
2019
Thermosphere structure and variability as inferred from the ExoMars Trace Gas Orbiter aerobraking campaign and in-situ MAVEN NGIMS observations
2019
Damping of gravity waves by kinetic processes in Jupiter's thermosphere
2019
Simulating the density of organic species in the atmosphere of Titan with a coupled ion-neutral photochemical model
2019
Seasonal Variability of Deuterium in the Upper Atmosphere of Mars
2019
Atmospheric Waves and Their Possible Effect on the Thermal Structure of Saturn's Thermosphere
2019
The MAVEN Neutral Data Working Group: Combining all MAVEN Neutral Measurements to Provide a Global Picture of Structure and Variability in the Mars Thermosphere
2019
Results from an Improved Model of Electrodynamics in Saturn's Upper Atmosphere
2019
Detection of Mesospheric CO$2$ Ice Clouds on Mars in Southern Summer
2019
Photochemical Escape of Carbon from Mars: Greater Than Previously Thought?
2019
The Impact of Crustal Magnetic Fields on the Thermal Structure of the Martian Upper Atmosphere
2018
Loss of the Martian atmosphere to space: Present-day loss rates determined from MAVEN observations and integrated loss through time
2018
A New Understanding of the Interaction Between Saturn and Its Rings
2018
Material Flux From the Rings of Saturn Into Its Atmosphere
2018
Martian Electron Temperatures in the Subsolar Region: MAVEN Observations Compared to a One-Dimensional Model
2018
The Impact of Comet Siding Spring's Meteors on the Martian Atmosphere and Ionosphere
2018
Effect of the Lateral Exospheric Transport on the Horizontal Hydrogen Distribution Near the Exobase of Mars
2018
Thermal Structure and Composition of Saturn's Upper Atmosphere From Cassini/Ion Neutral Mass Spectrometer Measurements
2018
The Composition and Thermal Structure of Saturn's Upper Atmosphere from Cassini/INMS Measurements
2018
Thermal Structure of the Martian Upper Atmosphere From MAVEN NGIMS
2018
Global Aurora on Mars During the September 2017 Space Weather Event
2018
Hydrogen escape at Mars Comparisons from MGCM-LMD simulations and observations from Mars-Express/SPICAM
2018
Titan's cold case files Outstanding questions after Cassini-Huygens
2018
Chemical interactions between Saturn's atmosphere and its rings
2018
MAVEN/IUVS Stellar Occultation Measurements of Mars Atmospheric Structure and Composition
2018
Modeling Carbon Production and Densities in the Martian Atmosphere Under MAVEN DeeDi2 Conditions
2018
Highlights from Imaging Ultraviolet Spectroscopy of the Mars Atmosphere with MAVEN/IUVS
2018
Modeling the Chemical Complexity in Titan's Atmosphere
2018
Global characteristics of gravity waves in the upper atmosphere of Mars as measured by MAVEN/NGIMS
2018
MAVEN IUVS Remote Sensing Highlights Relevant to Upcoming TGO Observations
2018
The flow of material inward from Saturn's rings
2018
Four years of upper atmospheric exploration at Mars with MAVEN and IUVS
2018
Variability of Martian Turbopause Altitudes
2018
Mars topographic clouds: MAVEN/IUVS observations and LMD MGCM predictions
2017
Temperature Profiles and Wave Structures Observed with IUVS/MAVEN Stellar Occultations
2017
Mars\rsquo atmospheric history derived from upper-atmosphere measurements of 38$Ar/36$Ar
2017
Mars Ozone mapping with MAVEN IUVS
2017
Global UV Imaging by MAVEN/IUVS: Diurnal Cloud Formation, Dust Storms and Atmospheric Scattering
2017
Non-LTE Models for the Thermal Structure of Hot Jupiters
2017
Detection of a persistent meteoric metal layer in the Martian atmosphere
2017
Effect of the lateral exospheric transport on the horizontal hydrogen distribution at the exobase of Mars
2017
Oceanus: A New Frontiers Orbiter to Study Titan's Potential Habitability
2017
Highlights from two years of remote sensing at Mars with MAVEN's Imaging Ultraviolet Spectrograph
2017
Total Atmospheric Loss from Upper-Atmospheric Structure of 36$Ar/38$Ar Observed by MAVEN
2017
Atmospheric Abundances Retrieved from IUVS/MAVEN Stellar Occultations
2017
Would Mars be Habitable If It Orbited an M Dwarf? Lessons from the MAVEN Mission
2017
He bulge revealed: He and CO$2$ diurnal and seasonal variations in the upper atmosphere of Mars as detected by MAVEN NGIMS
2017
Martian Metallic Ions Deposited by Comet Siding Spring Defy Expectations
2017
Resistive Heating and Ion Drag in Saturn's Thermosphere
2017
Signature of Metallic ion in the upper atmosphere of Mars following the passage of comet C/2013 A1 Siding Spring)
2017
Photochemical Escape of Oxygen from Mars: Consequences for Climate History
2017
Thermal Structure of Pluto's Lower Atmospehre
2017
Riddles of the Sphinx: Titan Science Questions at the End of Cassini-Huygens
2017
Characterization of High Altitude Clouds at the Martian Limb and Terminator Using MAVEN IUVS Observations
2017
The Metals Delivered by Comet Siding Spring to Mars
2017
A Persistent Meteoric Metal Layer in Mars' Atmosphere
2017
Titan's Oxygen Chemistry and its Impact on Haze Formation
2016
Structure of the martian ionosphere as revealed by the Neutral Gas and Ion Mass Spectrometer during the first two years of the MAVEN mission
2016
The Effect of Diurnal Variations on Ionospheric Radio Occultations
2016
MAVEN Imaging UV Spectrograph Results on the Mars Atmosphere and Atmospheric Escape
2016
Titan Aeromony and Climate Workshop
2016
New benzene absorption cross sections in the VUV, relevance for Titan's upper atmosphere
2016
Resistive Heating in Saturn's Thermosphere
2016
EUV-driven ionospheres and electron transport on extrasolar giant planets orbiting active stars
2016
Coupled, Nitrogen, Oxygen, Carbon and Ion Chemistry on Titan
2016
Martian Temperature Profiles Measured by MAVEN and MRO from 20 to 160 km
2016
Temperature Variations in the Martian Upper Atmosphere from the MAVEN Neutral Gas and Ion Mass Spectrometer
2016
Modeling of the Martian exosphere and first comparisons to IUVS/MAVEN observations
2016
Twilight Limb Observations of the Martian North Polar Hood by MAVEN IUVS
2016
IUVS/MAVEN Stellar Occultations
2016
Mars Atmospheric History Derived from Upper-Atmospheric Structure of 38}Ar/36}Ar Measured From MAVEN
2016
Twilight Limb Observations of Aerosols in the Martian Atmosphere by MAVEN IUVS
2016
Charge Balance in the Martian Ionosphere
2016
The Mars Atmosphere and Volatile Evolution MAVEN) Mission
2015
Dust observations at orbital altitudes surrounding Mars
2015
Titan's Upper Atmosphere from Cassini/UVIS Solar Occultations
2015
Early Composition, Structure, and Isotope Measurements in the Upper Atmosphere of Mars from MAVEN's Neutral Gas and Ion Mass Spectrometer
2015
On the escape of CH$4} from Pluto's atmosphere
2015
Ultraviolet observations of the hydrogen coma of comet C/2013 A1 Siding Spring) by MAVEN/IUVS
2015
Characterizing Atmospheric Escape from Mars Today and Through Time, with MAVEN
2015
Saturn's variable thermosphere from Cassini/UVIS occultations
2015
A Revised Sensitivity Model for Cassini INMS: Results at Titan
2015
The Imaging Ultraviolet Spectrograph IUVS) for the MAVEN Mission
2015
First measurements of composition and dynamics of the Martian ionosphere by MAVEN's Neutral Gas and Ion Mass Spectrometer
2015
Variability in Saturn's upper atmosphere from Cassini/UVIS occultations
2015
MAVEN Observations of the Effect of Comet Siding Spring on the Mars Atmosphere
2015
MAVEN IUVS in Stellar Occultation Mode: A First Look at Martian Atmospheric Density and Temperature Profiles
2015
Combined analysis of Far UV and Mid UV spectra obtained by the MAVEN IUVS instrument in a Stellar Occultation Mode
2015
Characterising exoplanets and their environment with UV transmission spectroscopy
2015
Radiative equilibrium and escape of Pluto's atmosphere
2015
N$2} state population in Titan's atmosphere
2015
The EChO science case
2015
Studying the Venus terminator thermal structure observed by SOIR/VEx with a 1D radiative transfer model
2015
Martian CO2 and O2 abundances obtained from MAVEN/IUVS stellar occultations
2015
A 1-D radiative conductive model to study the SOIR/VEx thermal profiles
2015
He Bulge Detection by MAVEN Neutral Gas and Ion Mass Spectrometer NGIMS) in the Upper Atmosphere of Mars
2015
Structure and composition of the neutral upper atmosphere of Mars from the MAVEN NGIMS investigation
2015
Structure and variability of the Martian upper atmosphere: Ultraviolet dayglow observations by MAVEN/IUVS
2015
Simulating the density of HC15N in the Titan atmosphere with a coupled ion-neutral photochemical model
2015
Day-to-night transport in the Martian ionosphere: Implications from total electron content measurements
2015
First Results From MAVEN's Imaging UV Spectrograph
2015
Influence of local ionization on ionospheric densities in Titan's upper atmosphere
2015
Metallic ions in the upper atmosphere of Mars from the passage of comet C/2013 A1 Siding Spring)
2015
Day-to-night transport in the Martian ionosphere
2015
Probing the Martian atmosphere with MAVEN/IUVS stellar occultations
2015
Early MAVEN DeeDicampaign reveals thermosphere and ionosphere variability
2015
MAVEN observations of the response of Mars to an interplanetary coronal mass ejection
2015
MAVEN IUVS observations of the aftermath of the Comet Siding Spring meteor shower on Mars
2015
Ionization balance in Titan's nightside ionosphere
2015
Predictions for the escape of CH$4} from Pluto
2015
Nonmigrating tides in the Martian atmosphere as observed by MAVEN IUVS
2015
Altitude profiles of O$2} on Mars from SPICAM stellar occultations
2015
Hot N2 in Titan's upper atmosphere
2015
O2 abundance on Mars observed by Mars Express SPICAM
2014
A Coupled Ion-Neutral Photochemical Model for the Titan Atmosphere
2014
The variability of Saturn's thermosphere from Cassini/UVIS occultations
2014
Perturbation of the Mars atmosphere by Siding Spring
2014
Perturbation of the Mars atmosphere by the near-collision with Comet C/2013 A1 Siding Spring)
2014
Escaping hydrogen from HD209458b
2014
MAVEN In Situ Measurements of Siding Spring and its Effect on Mars
2014
Density waves in Titan's upper atmosphere
2014
The Mars Magnetosphere in the Tail of Comet C/2013 A1(Siding Spring)
2014
The thermal structure of Titan's upper atmosphere, II: Energetics
2014
Na, K, and electrons in exoplanet atmospheres
2014
Electrodynamics on Extrasolar Giant Planets
2014
HST Observations of the Martian Hydrogen and Oxygen Exosphere
2014
Increasing Positive Ion Number Densities below the Peak of Ion-Electron Pair Production in Titan's Ionosphere
2014
Electrodynamics in Giant Planet Atmospheres
2014
Electron Densities and Alkali Atoms in Exoplanet Atmospheres
2014
Thermal escape from extrasolar giant planets
2014
Thermal structure at the Venus terminator: Comparison of SOIR/Vex profiles with a radiative transfer model
2014
The global precipitation of magnetospheric electrons into Titan's upper atmosphere
2014
Perturbation of the Mars Atmosphere by Comet C/2013 A1
2014
Influence of the local ionization sources on ionospheric densities in Titan's upper atmosphere
2014
The escape of heavy atoms from the ionosphere of HD209458b. I. A photochemical-dynamical model of the thermosphere
2013
On the thermal electron balance in Titan's sunlit upper atmosphere
2013
Auroral electron precipitation and flux tube erosion in Titan's upper atmosphere
2013
Solar occultation by titan measured by cassini/UVIS
2013
The escape of heavy atoms from the ionosphere of HD209458b. II. Interpretation of the observations
2013
The thermal structure of titan's upper atmosphere, I: Temperature profiles from Cassini INMS observations
2013
Radiative forcing of the stratosphere of Jupiter, Part I: Atmospheric cooling rates from Voyager to Cassini
2013
Compositional and structural investigation of HCN polymer through high resolution mass spectrometry
2013
The density and temperature structure near the exobase of Saturn from Cassini UVIS solar occultations
2013
Aerosol growth in Titan's ionosphere
2013
EChO: Exoplanet characterisation observatory
2012
The CH sub 4 sub structure in Titan's upper atmosphere revisited
2012
Rapid association reactions at low pressure: Impact on the formation of hydrocarbons on titan
2012
Formation of amino acids and nucleotide bases in a titan atmosphere simulation experiment
2012
The mesosphere and lower thermosphere of Titan revealed by Cassini/UVIS stellar occultations
2011
The implications of the H sub 2 sub variability in Titan's exosphere
2011
Condensation in Titan's atmosphere at the Huygens landing site
2011
Energy deposition and primary chemical products in Titan's upper atmosphere
2011
Composition and structure of the ionosphere and thermosphere
2010
Titan's vertical aerosol structure at the Huygens landing site: Constraints on particle size, density, charge, and refractive index
2010
Characterizing the thermosphere of HD209458b with UV transit observations
2010
Formation of NH sub 3 sub and CH sub 2 sub NH in Titan's upper atmosphere
2010
Ionization sources in Titan's deeionosphere
2010
Ion transport in Titan's upper atmosphere
2010
Structure of Titan's ionosphere: Model comparisons with Cassini data
2009
TandEM: Titan and Enceladus mission
2009
Model-data comparisons for Titan's nightside ionosphere
2009
Diurnal variations of Titan's ionosphere
2009
Analysis of Titan's neutral upper atmosphere from Cassini Ion Neutral Mass Spectrometer measurements
2009
The detached haze layer in Titan's mesosphere
2009
On the amount of heavy molecular ions in Titan's ionosphere
2009
Negative ion chemistry in Titan's upper atmosphere
2009
Laboratory studies of molecular growth in the titan ionosphere
2009
Formation and distribution of benzene on Titan
2008
Horizontal structures and dynamics of Titan's thermosphere
2008
Origin of oxygen species in Titan's atmosphere
2008
Distribution and escape of molecular hydrogen in Titan's thermosphere and exosphere
2008
Aeronomy of extra-solar giant planets
2008
Plasma temperatures in Saturn's ionosphere
2008
Methance escape from Titan's atmosphere
2008
Sensitivity of a Titan ionospheric model to the ion-molecule reaction parameters
2008
Ion chemistry and N-containing molecules in Titan's upper atmosphere
2007
On magnetospheric electron impact ionisation and dynamics in Titan's ram-side and polar ionosphere A Cassini case study
2007
Cassini Ion and Neutral Mass Spectrometer data in Titan's upper atmosphere and exosphere: Observation of a suprathermal corona
2007
Advanced technologies demonstrated by the miniature integrated camera and spectrometer MICAS) aboard deespace 1
2007
Sulfur volcanism on Io
2007
Composition of Titan's ionosphere
2006
Corrigendum to Aeronomy of extra-solar giant planets at small orbital distances Icarus 170 2004) 167-179] DOI:10.1016/j.icarus.2004.02.008)
2006
A global circulation model of Saturn's thermosphere
2006
Electron temperature of Titan's sunlit ionosphere
2006
The nitrogen chemistry of titan's upper atmosphere revealed
2006
Cassini ion and neutral mass spectrometer: Enceladus plume composition and structure
2006
Waves and horizontal structures in Titan's thermosphere
2006
The vertical structure of Titan's upper atmosphere from Cassini Ion Neutral Mass Spectrometer measurements
2006
Titan's ionosphere: Model comparisons with Cassini Ta data
2005
Ion Neutral Mass Spectrometer results from the first flyby of Titan
2005
Oxygen ions observed near Saturn's A ring
2005
Gravity waves in Jupiter's stratosphere, as measured by the Galileo ASI experiment
2005
Observations of Titan's mesosphere
2005
Short-wavelength infrared 1.3-2.6 μm) observations of the nucleus of Comet 19P/Borrelly
2004
The atmospheric signature of Io's Prometheus plume and anti-jovian hemisphere: Evidence for a sublimation atmosphere
2004
9969 Braille: DeeSpace 1 infrared spectroscopy, geometric albedo, and classification
2004
Formation of jets in Comet 19P/Borrelly by subsurface geysers
2004
The ionospheres-thermospheres of the giant planets
2004
Aeronomy of extra-solar giant planets at small orbital distances
2004
The Cassini Ion and Neutral Mass Spectrometer INMS) investigation
2004
HST observation of the atmospheric composition of Jupiter's equatorial region: Evidence for tropospheric C sub 2 sub H sub 2 sub
2003
HCN fluorescence on Titan
2003
On the global distribution of neutral gases in Titan's upper atmosphere and its effect on the thermal structure
2003
The nucleus of 19/P Borrelly as revealed by deespace 1
2002
A compact high-resolution 3-D imaging spectrometer for discovering Oases on Mars
2002
Observations of comet 19P/Borrelly by the miniature integrated camera and spectrometer aboard deespace 1
2002
The deespace 1 encounter with comet 19P/Borrelly
2002
The effect of dynamics on the composition of Titan's upper atmosphere
2002
Structure of the Jovian Stratosphere at the Galileo Probe Entry Site
2001
Upper limits on gaseous CO at Pluto and Triton from high-resolution near-IR spectroscopy
2001
Dynamics of Titan's thermosphere
2000
Discovery of gaseous S sub 2 sub in Io's Pele plume
2000
The thermosphere of Titan simulated by a global three-dimensional time-dependent model
2000
Equilibrium chemistry in a brown dwarf's atmosphere: Cesium in Gliese 229B
2000
HST Detection of h sub 2 sub Raman Scattering in the Jovian Atmosphere
1999
Disequilibrium chemistry in a brown dwarf's atmosphere: Carbon monoxide in Gliese 229B
1999
Emissivity and the fate of Pluto's atmosphere
1999
The dusty atmosphere of the brown dwarf Gliese 229B
1998
Gravity waves in Jupiter's thermosphere
1997
Hydrocarbon ions in the ionosphere of Titan
1997
Kuiper Express: a sciencecraft
1996
Structure of Jupiter's upper atmosphere: Predictions for Galileo
1996
Sciencecraft process
1996
A model for the overabundance of methane in the atmospheres of Pluto and Triton
1996
Planetary Integrated Camera Spectrometer PICS) a new approach to developing a self-sequencing, integrated, multiwavelength instrument
1996
The emissivity of volatile ices on Triton and Pluto
1996
Ultraviolet spectroscopy of the SL9 impact sites: I. The 175-230 nm region
1996
New Analysis of the Voyager UVS H Lyman-α Emission of Saturn
1995
Methane heating rates in outer planet atmospheres
1995
HST spectroscopic observations of Jupiter after the collision of comet Shoemaker-Levy 9
1995
The Distribution Hydrocarbons in Neptune's Upper Atmosphere
1993
Triton's surface-atmosphere energy balance
1992
The effect of surface roughness on Triton's volatile distribution
1992
Vibrationally excited H sub 2 sub in the outer planets thermosphere: Fluorescence in the Lyman and Werner bands
1991
Energy balance and plume dynamics in Triton's lower atmosphere
1991
Non-LTE models of Titan's upper atmosphere
1991
Vibrationally excited H sub 2 sub in the upper atmosphere of Saturn
1990
Ultraviolet spectrometer observations of Neptune and Triton
1989
The far ultraviolet reflection spectrum of Uranus: Results from the Voyager encounter
1989
Evidence for a molecule heavier than methane in the atmosphere of Pluto
1989
Ultraviolet spectrometer observations of Uranus
1987
ANALYSIS OF RAMAN SCATTERED LY- alpha EMISSIONS FROM THE ATMOSPHERE OF URANUS.
1987
ULTRAVIOLET SPECTROMETER OBSERVATIONS OF URANUS.
1986
URANIAN H LY- alpha EMISSION: THE INTERSTELLAR WIND SOURCE.
1986
High spectral resolution line profiles and images of comet Halley
1985
Impurity levels and power loading in the pdx tokamak with high power neutral beam injection
1982
MULTICHANNEL GRAZING-INCIDENCE SPECTROMETER FOR PLASMA IMPURITY DIAGNOSIS SPRED.
1982

PERTURBATION OF TOKAMAK EDGE PLASMA BY LASER BLOW-OFF IMPURITY INJECTION.
1982

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