Search Publications
Gravity Waves in Titan's Atmosphere: A Comparison Between Linearized Wave Model Calculations and HASI Observations
Cui, Jun; Huang, Jianping; Hao, Yongqiang +3 more
The Huygens Atmospheric Structure Instrument (HASI) detected wavelike temperature fluctuations from 500 to 1,000 km on Titan. However, these fluctuation structures have not been satisfactorily reproduced by any theoretical model to date. In this study, we construct a full-wave model to simulate the observed gravity wave structure. The model includ…
The atypical generation mechanism of Titan's Schumann resonance
Béghin, Christian
The observation of a presumed Schumann resonance (SR) during the landing of the Huygens Probe in Titan's atmosphere on January 2005 was subsequently reported and interpreted by Béghin et al. (2007, 2009, 2010, 2012) as being generated through the interaction of Saturn's magnetosphere with Titan's ionosphere rather than from the lightning activity …
Simulating the one-dimensional structure of Titan's upper atmosphere: 3. Mechanisms determining methane escape
Bar-Nun, Akiva; Bougher, Stephen W.; Mandt, Kathleen E. +11 more
This investigation extends the work presented by Bell et al. (2010a, 2010b). Using the one-dimensional (1-D) configuration of the Titan Global Ionosphere-Thermosphere Model (T-GITM), we quantify the relative importance of the different dynamical and chemical mechanisms that determine the CH4 escape rates calculated by T-GITM. Moreover, …
Comment on “An analysis of VLF electric field spectra measured in Titan's atmosphere by the Huygens probe” by J. A. Morente et al.
Berthelier, Jean-Jacques; Béghin, Christian; Hamelin, Michel +4 more
Abstract Available from http://www.agu.org
Reply to comment by R. Grard et al. on “An analysis of VLF electric field spectra measured in Titan's atmosphere by the Huygens probe”
Morente, Juan A.; Portí, Jorge A.; Navarro, Enrique A. +1 more
Abstract Available from http://www.agu.org
Composition of Titan's lower atmosphere and simple surface volatiles as measured by the Cassini-Huygens probe gas chromatograph mass spectrometer experiment
Atreya, S. K.; Lunine, J. I.; Kasprzak, W. T. +7 more
The Cassini-Huygens probe gas chromatograph mass spectrometer (GCMS) determined the composition of the Titan atmosphere from ∼140 km altitude to the surface. After landing, it returned composition data of gases evaporated from the surface. Height profiles of molecular nitrogen (N2), methane (CH4), and molecular hydrogen (H
Chemical composition of simulated Titan's midatmospheric aerosols
Bar-Nun, A.; Dimitrov, V.; Jacovi, R. +1 more
A large fraction of the major unsaturated species (C2H2 C2H4, HCN, and HC3N) with mixing ratios of about 3 × 10-6, 10-7-10-8, 3 × 10-7, and 10-9-10-10 reside in Titan's atmosphere between 150 and 500 km (Vinatier et al., 2009; C…
An analysis of VLF electric field spectra measured in Titan's atmosphere by the Huygens probe
Morente, Juan A.; Portí, Jorge A.; Blanchard, Cedric +2 more
A numerical simulation of Titan's electromagnetic cavity in the VLF band is carried out using the Transmission Line Matrix (TLM) method, with the aim of assessing the VLF electric field spectra sent by the Huygens probe. In an Earth-like model, successive peaks would be expected in the spectra, associated with multiple reflections of the electroma…
The drying of Titan's dunes: Titan's methane hydrology and its impact on atmospheric circulation
Mitchell, Jonathan L.
We explore the effect of a finite reservoir of methane on Titan's atmospheric circulation, precipitation patterns, and surface methane content. We develop a soil model that accounts for the methane cycle in the surface-atmosphere system, and we implement this surface model in a two-dimensional model of the Titan's atmosphere. Seasonal oscillations…
Predictions of the electrical conductivity and charging of the cloud particles in Jupiter's atmosphere
O'Brien, K.; Whitten, R. C.; Borucki, W. J. +1 more
The electrical conductivity and electrical charge on cloud particles (composed of ammonia, ammonium hydrosulfide, and water) in the atmosphere of Jupiter are computed for pressures between 5.5 and 0.1 bars. The source of ionization is galactic cosmic rays (GCR). The distribution of charge among the various reservoirs is a function of altitude and …