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

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.5205p&link_type=abstract

American Astronomical Society, DPS meeting #31, #52.05

Astronomy and Astrophysics

Astronomy

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 H_2(v=0,1) and CH_3. The H and CH_3 distributions have been calculated using a 1-D photochemical-diffusion model with the column H constrained using the Lyman--alpha airglow. For H_2 effective vibrational temperatures, Tv, between 1 and 4 times kinetic we find D columns between 4x 10(11) and 2 x 10(13) atoms cm(-2) . HD can be vibrationally excited due to VV energy transfer from H_2(v=1). Using a radiative transfer model with coupling of the H and D Lyman--alpha 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 x 10(17) ,cm(-2) --compatible with equatorial Lyman--alpha 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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