Modeling Titan's Ionosphere and Its Coupled Chemistry and Dynamics

Details Modeling Titan's Ionosphere and Its Coupled Chemistry and Dynamics Modeling Titan's Ionosphere and Its Coupled Chemistry and Dynamics

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa11a..06b&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA11A-06

Physics

[2459] Ionosphere / Planetary Ionospheres, [2753] Magnetospheric Physics / Numerical Modeling, [5435] Planetary Sciences: Solid Surface Planets / Ionospheres, [6281] Planetary Sciences: Solar System Objects / Titan

Scientific paper

We present three-dimensional global simulations of Titan's ionosphere, using the Titan Global Ionosphere-Thermosphere Model (T-GITM) (Bell et al. [2010a, 2010b]). We investigate the impact of including ion winds calculated by a global MHD model (Ma et al. [2006, 2007, 2009]) and the heavy ions cascading into Titan's upper atmosphere, as simulated by a hybrid model (Sillanpaa et al. [2006, 2007, 2011]). We compare our simulations for the ion densities to recently updated Ion-Neutral Mass Spectrometer (INMS) measurements (Mandt et al. [2011]). We discuss where the 3-D simulations reproduce the INMS major ion data well, and where more work is required. In particular, we investigate the need for added ion-neutral chemical pathways, as suggested by the recent work of Westlake et al. [2011] on the major ion species (HCNH+ and C2H5+). Our primary goal is to highlight our current state of global modeling and to point out the current challenges to fully understanding current ionosphere measurements.

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