JOVIAN SYSTEM DATA ANALYSIS PROGRAM PROPOSAL SUMMARY
ROSS-98 NRA 98-OSS-05
Jun 04, 1998
The goal of this program is to determine the temperature
structure, the properties of large particles in the ammonia clouds,
and some aspects of the dynamics of Jupiter's atmosphere from
filtered radiometry taken by the Galileo Photopolarimeter (PPR)
experiment. The result of the proposed research is intended to
complete as far as possible the analysis of PPR filtered radiometric
data obtained during the primary mission.
Over the next two years, we will determine the temperature field
of Jupiter over regions of the planet observed by the PPR experiment.
These include small and medium features observed synoptically with
the other remote sensing instruments, larger regional maps, and
pole-to-pole latitudinal scans. The thermal wind shears derived from
these temperature fields will provide information about how the winds
change with altitude and will complement cloud-tracked wind
measurements made by the Galileo SSI camera. Long-wavelength
measurements will be used to determine the opacity of the ammonia
condensate cloud and with radii greater than ~1 micron. A
comparison with earth-based data obtained and analyzed independently
will further constrain the size of particles in the ammonia clouds.
We will also model the dynamics of a large-scale, quasi-stationary
wave observed to be meridionally trapped in the retrograde jet
associated with the North Equatorial Belt. This study will yield
new results about the vertical structure and origin of this class of
The following articles published by the proposers show the
expertise gained in analyzing the data obtained in the primary
G. S. Orton, J. R. Spencer, L. D. Travis, T. Z. Martin, L. K.
Tamppari, 1996. Results of the Galileo Photopolarimeter/Radiometer
on Jupiter and the Galilean Satellites. Science 274, 388-391.
G. Orton, B. Fisher, J. L. Ortiz, P. Yanamandra-Fisher, K. Rages, R.
Howell, B. Klebe, R. Stencel, P. Drossart, J. Lecacheux, F. Colas,
E. Frappa, C. Hernandez, D. Parker, I. Miyazaki, S. Stewart, J.
Stansberry, J. Spencer, W. Golisch, D. Griep, M.-C. Hainaut, R.
Joseph, C. Kaminski, J. Banjevic, C. Connor, S. Hinkley, M.
Marinova, B. Marriage, E. Noe Dobrea. 1996. Characterization of
Jupiter's atmosphere from Galileo and earth-based observations
during the Ganmede-1 and Ganymede-2 orbit encounters. Bull. Amer.
Astron. Soc. 28, 1137.
G. Orton, T. Martin, T. Tamppari. O. Liepack, B. Fisher, J. Friedson,
M. Ressler, R. Yanamandra-Fisher, K. Baines, R. West, L. Travis, S.
Stewart, H. Peiris, E. Noe Dobrea, S. Hinkley, W. Golisch, D. Griep,
and C. Kaminski. 1997 Atmospheric structure of Jupiter from
radiometric observations of the Galileo Photopolarimeter-Radiometer
(PPR) and ancillary earth-based observations. Bull Amer. Astron.
Soc. 29, 1005.