Magnetospheric Electrons as a Source of Titan's Ionosphere: Model Comparisons with Cassini Data

Details Magnetospheric Electrons as a Source of Titan's Ionosphere: Model Comparisons with Cassini Data Magnetospheric Electrons as a Source of Titan's Ionosphere: Model Comparisons with Cassini Data

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p52a..05c&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #P52A-05

Physics

2455 Particle Precipitation, 5408 Aurorae And Airglow, 5435 Ionospheres (2459), 5443 Magnetospheres (2756), 6025 Interactions With Solar Wind Plasma And Fields

Scientific paper

The Cassini Ion and Neutral Mass Spectrometer (INMS) onboard the Cassini Orbiter measured the neutral composition and structure of the upper atmosphere during 3 encounters. The INMS measured the ionospheric composition only on the outbound leg of the T5 pass, when the spacecraft was on the nightside. Possible ionization sources for this nightside ionosphere include transport from the dayside, or (more likely) electron impact ionization associated with precipitation of magnetospheric electrons. We use a model of Titan's ionosphere, which includes ion chemistry, suprathermal electron transport, and electron energetics to investigate how the ionosphere responds to magnetospheric inputs. In particular, model results seem to suggest that magnetospheric electrons with energies between about 25 eV and 800 eV are needed to explain the ion density profiles measured by the INMS. The model is also used to interpret the ion composition seen by the INMS and to test the ion chemistry scheme used.

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