Physics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..123k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, Feb. 1991, p. 123-126.
Physics
18
Hydrocarbons, Hydrogen Ions, Ionospheric Electron Density, Jupiter Atmosphere, Planetary Ionospheres, Absorption Cross Sections, Atmospheric Models, E Region, Pioneer 10 Space Probe, Pioneer 11 Space Probe, Jupiter, Ionosphere, Models, Photoionization, Hydrocarbons, Spectra, Ions, Chemical Reactions, Layers, Altitude, Density, Formation, Ethene, Ethylene, Methane, Acetylene, Ethane, Production Rate, Electrons, Spacecraft Observations
Scientific paper
A model of the Jovian ionosphere was constructed, that includes direct photoionization of hydrocarbon molecules. A high-resolution solar spectrum was synthesized from Hinteregger's solar maximum spectrum (F79050N), and high-resolution cross sections for photoabsorption by H2 bands in the range 842 to 1116 A were constructed. Two strong solar lines and about 30 percent of the continuum flux between 912 and 1116 A penetrate below the methane homopause despite strong absorption by CH4 and H2. It is found that hydrocarbons (mainly C2H2 are ionized at a maximum rate of 55/cu cm per sec at 320 km above the ammonia cloud tops. The hydrocarbon ions produced are quickly converted to more complex hydrocarbon ions through reactions with CH4, C2H2, C2H6, and C2H4. It is found that a hydrocarbon ion layer is formed near 320 km that is about 50 km wide with a peak density in excess of 10,000/cu cm.
Fox Lewis J.
Kim Yeon Han
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