Titan's upper ionosphere

Details Titan's upper ionosphere Titan's upper ionosphere

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...362..354i&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 362, Oct. 10, 1990, p. 354-363.

Astronomy and Astrophysics

Astrophysics

69

Electron Impact, Gas Ionization, Planetary Ionospheres, Satellite Atmospheres, Titan, Gas-Ion Interactions, Molecular Ions, Planetary Magnetospheres, Shear Layers

Scientific paper

As a result of electron impact ionization and photoionization, an ionosphere should be built up at the high-altitude region of Titan's atmosphere. New calculations presented here predict the presence of significant amounts of CH5(+), N2H(+), C2H2(+), and C2H3(+) ions near the ionospheric peak. Because of fast ion-neutral reactions with CH4 and N2, the number density of the Ar(+) ions would not exceed a value of more than 10/cu cm in the upper ionosphere if argon has a mixing ratio about 0.01 near the homopause. The ionospheric flow dynamics are studied in the limits of one-fluid mass-loaded flow and of diffusion-convection approximation. Both approaches show that ion-neutral friction acts as a cushion against plasma streaming effects.

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