JOVIAN SYSTEM DATA ANALYSIS PROGRAM PROPOSAL SUMMARY
ROSS-98 NRA 98-OSS-05
Jun 04, 1998
GENERAL OBJECTIVES Analyze Galileo Orbiter and Probe data to
improve models of Jovian satellite interiors and Jupiter's
GENERAL APPROACH Analysis of Galileo Orbiter gravity, magnetic
field, and imaging data of the satellites. Theoretical modelling of
internal structure, thermal evolution, and interior dynamics to
elucidate the significance of the data. Analysis of Galileo Probe
atmospheric structure data to identify gravity waves in Jupiter's
atmosphere. Theoretical modelling to study the heating of the Jovian
upper atmosphere by upward propagating gravity waves.
SIGNIFICANCE The proposed studies will use data obtained by the
Galileo Orbiter and Probe to improve our understanding of the
Galilean satellites and the atmosphere of Jupiter.
PROPOSED RESEARCH Analyze radio Doppler data from 4 flybys of
Ganymede during the Galileo mission to determine the gravitational
field of the satellite through spherical harmonic degree 4. Use the
degree 2 field to derive interior models of Ganymede and the higher
degree gravitational coefficients to yield information on gravity
anomalies in the regions of closest approach to Ganymede. Explore
geophysical models of density and topography anomalies on the
rock-ice interface within Ganymede to understand the gravity
anomalies and determine the thickness of Ganymede's outer ice shell.
Carry out a synthesis of gravity, magnetic field, and imaging
data from the Galileo Orbiter mission to better understand the
thermal-dynamical evolution of the Galilean satellite system. Develop
coupled thermal-dynamical evolution models of the satellites to
facilitate the synthesis. Analyze atmospheric structure data from
the Galileo Probe. Identify gravity waves in the data and determine
their characteristics. Use a full-wave model to study gravity wave
propagation into Jupiter's upper atmosphere and determine the
contribution of gravity waves to heating the upper atmosphere.