Ion Neutral Mass Spectrometer Results from the First Flyby of Titan

  title={Ion Neutral Mass Spectrometer Results from the First Flyby of Titan},
  author={J. Waite and H. Niemann and R. Yelle and W. Kasprzak and T. Cravens and J. Luhmann and R. McNutt and W. Ip and D. Gell and Virginie De La Haye and Ingo M{\"u}ller-Wordag and B. Magee and N. Borggren and S. Ledvina and G. Fletcher and E. Walter and Ryan Miller and S. Scherer and R. Thorpe and J. Xu and B. Block and K. Arnett},
  pages={982 - 986}
The Cassini Ion Neutral Mass Spectrometer (INMS) has obtained the first in situ composition measurements of the neutral densities of molecular nitrogen, methane, molecular hydrogen, argon, and a host of stable carbon-nitrile compounds in Titan's upper atmosphere. INMS in situ mass spectrometry has also provided evidence for atmospheric waves in the upper atmosphere and the first direct measurements of isotopes of nitrogen, carbon, and argon, which reveal interesting clues about the evolution of… Expand
High-Altitude Production of Titan's Aerosols
Measurements with the Cassini Ion and Neutral Mass Spectrometer (INMS) and two Cassini Plasma Spectrometer (CAPS) sensors, the Ion beam Spectrometer (IBS) and the Electron Spectrometer (ELS), haveExpand
Isotopic evolution of the major constituents of Titan's atmosphere based on Cassini data
Using Cassini ion neutral mass spectrometer stable isotope observations, we have developed a comprehensive method for modeling the time-evolution of the stable isotopic ratios in Titan’s majorExpand
Ion chemistry and N-containing molecules in Titan's upper atmosphere
High-energy photons, electrons, and ions initiate ion–neutral chemistry in Titan’s upper atmosphere by ionizing the major neutral species (nitrogen and methane). The Ion and Neutral Mass SpectrometerExpand
Titan's atmosphere is unique because dissociation of N2 and CH4, the primary atmospheric constituents, provides the H, C, and N atoms necessary for the synthesis of complex organic molecules. TheExpand
Cassini Ion and Neutral Mass Spectrometer data in Titan's upper atmosphere and exosphere: Observation of a suprathermal corona
[1] The neutral nitrogen and methane measurements made by Ion and Neutral Mass Spectrometer during Cassini flybys TA, TB, and T5 in Titan's upper atmosphere and exosphere are presented. LargeExpand
The Cassini UVIS Stellar Probe of the Titan Atmosphere
The Cassini Ultraviolet Imaging Spectrometer (UVIS) observed the extinction of photons from two stars by the atmosphere of Titan during the Titan flyby to determine the asymptotic kinetic temperature at the top of the atmosphere. Expand
Composition and Structure of the Ionosphere and Thermosphere
Airglow emissions, radio and solar occultation data from the Voyager mission over a quarter of a century ago provided the main source of information on the composition and structure of Titan's upperExpand
The abundances of constituents of Titan's atmosphere from the GCMS instrument on the Huygens probe
Direct atmospheric measurements from the Gas Chromatograph Mass Spectrometer (GCMS), including altitude profiles of the constituents, isotopic ratios and trace species (including organic compounds), were reported, confirming the primary constituents were confirmed to be nitrogen and methane. Expand
Analysis of Titan's neutral upper atmosphere from Cassini Ion Neutral Mass Spectrometer measurements in the Closed Source Neutral mode
In this thesis I present an in-depth study of the distribution of various neutral species in Titan’s upper atmosphere, at altitudes between 950 and 1,500 km for abundant species (N₂, CH₄ as well asExpand
Composition and chemistry of Titan's thermosphere and ionosphere
  • V. Vuitton, R. Yelle, P. Lavvas
  • Chemistry, Medicine
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2008
Observations of Titan's ionospheric chemistry indicate that molecular growth starts in the upper atmosphere rather than at lower altitude, and that Benzene (C6H6) is created by ion chemistry at high altitudes and its main photolysis product, the phenyl radical, is at the origin of the formation of aromatic species at higher altitude. Expand


Isotopic Composition of Solar Wind Nitrogen: First In Situ Determination with the CELIAS/MTOF Spectrometer on board SOHO
Using the high-resolution Mass Time-of-Flight (MTOF) spectrometer of the Charge, Element, and Isotope Analysis System (CELIAS) experiment on board the Solar and Heliospheric Observatory (SOHO), weExpand
Evolution of a Nitrogen Atmosphere on Titan
Photochemical calculations indicate that if NH3 outgassed from Titan it should have been converted to a dense N2 atmosphere during the lifetime of the satellite, and this may explain the failure of recent attempts to detect NH3 in the upper atmosphere of Titan. Expand
High-temperature shock formation of N2 and organics on primordial Titan
To simulate the effects of an impact in Titan's atmosphere, the focused beam of a high-power laser is used, a method that has been shown to simulate shock phenomena, and results in a total N2 production comparable to that present in Titan’s atmosphere and putative ocean. Expand
Titan's Atmospheric Temperatures, Winds, and Composition
Early Cassini infrared observations of Titan show a stratopause at an altitude of 310 kilometers (and 186 kelvin at 15°S), and the concentrations of several stratospheric organic compounds are enhanced at mid- and high northern latitudes, and the strong zonal winds may inhibit mixing between these latitudes and the rest of Titan. Expand
Clathrate and Ammonia Hydrates at High Pressure: Application to the Origin of Methane on Titan
The origin of methane at the present surface of Titan is modeled in light of new high-pressure phase diagrams of ammonia-water compounds and clathrate hydrate. Using recently published experimentalExpand
Submillimeter Observations of Titan: Global Measures of Stratospheric Temperature, CO, HCN, HC3N, and the Isotopic Ratios 12C/13C and 14N/15N
Interferometric observations of the atmosphere of Titan were performed with the Submillimeter Array on two nights in 2004 February to investigate the global average vertical distributions of severalExpand
Titan's atmosphere from voyager infrared observations: I. The gas composition of Titan's equatorial region
The abundances of minor atmospheric constituents in Titan's equatorial region have been inferred from Voyager 1 infrared spectra. A temperature profile for the stratosphere was retrieved from theExpand
Thermodynamics of clathrate hydrate at low and high pressures with application to the outer solar system
The thermodynamic stability of clathrate hydrate is calculated under a wide range of temperature and pressure conditions applicable to solar system problems, using a statistical mechanical theoryExpand
Isotopic fractionation of stratospheric nitrous oxide
Modeling results indicate that there is no compelling reason to invoke a significant chemical source of N2O in the middle atmosphere and that individual N 2O isotopomers might be useful tracers of stratospheric air parcel motion. Expand
Millimeter and Submillimeter Heterodyne Observations of Titan: Retrieval of the Vertical Profile of HCN and the12C/13C Ratio
Abstract We report new observations of the (1–0) line of HCN at 88.63 GHz, emitted by Titan, made in May 1995 with the IRAM 30-m radiotelescope located at Pico Veleta (Spain). Compared to previousExpand