Estimates of atomic deuterium abundance and Lyman-alpha airglow in the thermosphere of Jupiter

We have made calculations of the atomic D distribution in the thermosphere of Jupiter. The principal reactions determining the D abundance appear to b e generation by reaction of H with vibrationally hot HD and loss by reactio n of D with H-2(v=0,1) and CH3. The H and CH3 distributions have been calcu lated using a 1-D photochemical-diffusion model with the column H constrain ed using the Lyman-alpha airglow. For H-2 effective vibrational temperature s, T-v, between 1 and 4 times kinetic we find D columns between 4 x 10(11) and 2 x 10(13) atoms cm(-2). HD can be vibrationally excited due to VV ener gy transfer from H-2(v=1). Using a radiative transfer model with coupling o f 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 similar to 3.5 x 10(17) cm(-2), compatible with equatorial Lyman-alpha airglow observations, the disk D intensity varies from 80 to 60 0 R for overhead Sun and viewing, whereas on the terminator the D maximum t otal intensity is similar to 60 R at similar to 860 km above the 1 bar leve l for the maximum D column.