Estimates of Atomic Deuterium Abundance and Lyman-Alpha Airglow in the Thermosphere of Jupiter

Details Estimates of Atomic Deuterium Abundance and Lyman-Alpha Airglow in the Thermosphere of Jupiter Estimates of Atomic Deuterium Abundance and Lyman-Alpha Airglow in the Thermosphere of Jupiter

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3177p&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 20, p. 3177-3180

Physics

8

Atmospheric Composition And Structure: Planetary Atmospheres

Scientific paper

We have made calculations of the atomic D distribution in the thermosphere of Jupiter. The principal reactions determining the D abundance appear to be generation by reaction of H with vibrationally hot HD and loss by reaction of D with H2 (v=0,1) and CH3. The H and CH3 distributions have been calculated using a 1-D photochemical-diffusion model with the column H constrained using the Lyman-α airglow. For H2 effective vibrational temperatures, Tv, between 1 and 4 times kinetic we find D columns between 4×1011 and 2×1013 atoms cm-2. HD can be vibrationally excited due to VV energy transfer from H2(v=1). Using a radiative transfer model with coupling of the H and D Lyman-α lines we have calculated line profiles and total intensities across the Jovian disk and on the limb. For the above D columns and a H column ~3.5×1017cm-2, compatible with equatorial Lyman-α airglow observations, the disk D intensity varies from 80 to 600 R for overhead Sun and viewing, whereas on the terminator the D maximum total intensity is ~60 R at ~860 km above the 1 bar level for the maximum D column.

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