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Abstract. Doppler radio tracking of the Galileo probe-to-orbiter relay, previously analyzed for its in situ measure of

Summary: Abstract. 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 shows a
recordof 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
downwardincreasing static stability within the 5 20 bar region
of Jupiter's atmosphere. A matchedextension to deeperlevels 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
The density stratification of Jupiter's deep wind layer, as
imposed by the vertical gradient of mean molecular weight and/or
non-adiabaticdeparturesin the temperature lapse rate, is key to
understanding its atmospheric circulation and meteorology (cf.


Source: Atkinson, David H. - Department of Electrical and Computer Engineering, University of Idaho
Fridlind, Ann - Earth Science Division, NASA Ames Research Center


Collections: Engineering; Environmental Sciences and Ecology; Physics