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ABSTRACT

Allison and Atkinson 2001

Allison, M., and D.H. Atkinson, 2001: Galileo Probe Doppler residuals as the wave-dynamical signature of weakly stable, downward-increasing stratification in Jupiter's deep wind layer. Geophys. Res. Lett., 28, 2747-2750, doi:10.1029/2001GL012927.

Doppler radio tracking of the Galileo probe-to-orbiter relay, previously analyzed for its in situ measure of Jupiter's zonal wind at the equatorial entry site, also show a record of significant residual fluctuations apparently indicative of varying vertical motions. Regular oscillations over pressure depth in the residual Doppler measurements of roughly 1-8 Hz (increasing upward), as filtered over a 134 sec window, are most plausibly interpreted as gravity waves, and imply a weak, but downward increasing static stability within the 5-20 bar region of Jupiter's atmosphere. A matched extension to deeper levels of an independent inertial stability constraint from the measured vertical wind shear at 1-4 bars is roughly consistent with a static stability of ~0.5 K/km near the 20 bar level, as independently detected by the probe Atmospheric Structure Instrument.

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