8377(  2) - 12/18/98 16:52  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      8377
                                                       Version: 2
                                                       Check-in Date: 18-Dec-1998
                                                                      16:51:36

1.Proposal Title:
Multispectral Investigation of Jovian Cloud Structure
------------------------------------------------------------------------------------
2. Proposal For  3. Cycle
AR               8
------------------------------------------------------------------------------------
4. Investigators
                                                                                     Contact?
    PI: Lawrence Sromovsky                University of Wisconsin-Madison

------------------------------------------------------------------------------------
5. Abstract

We propose to use archived HST images of Jupiter, made before and after the December
1995 Galileo Probe in-situ observations, to investigate cloud structure in and
adjacent to the probe entry point and in similar regions at other locations. Prior
analyses of Jovian cloud structure, having limited constraints to apply to an
underdetermined problem, made assumptions such as semi-infinite clouds, equality of
single scattering albedos for upper and lower clouds, uniform phase functions for
all wavelengths, and specific cloud base locations. We propose to use new
constraints on cloud properties and abundance of condensible species provided by the
Galileo Nephelometer, Net Flux Radiometer, and Mass Spectrometer, to reduce the
solution space for interpreting remote observations. The primary HST inputs into the
proposed analysis will be the wavelength-dependent albedo and limb darkening
characteristics of hot spot regions and their surroundings, using WFPC2 and NICMOS
imaging from UV to 2.3 microns, with varying Rayleigh scattering and gas absorption
as probes of vertical structure, and continuum wavelengths as a probe of particle
properties. We will also use several Galileo orbiter images to help constrain
heterogeneous and vertical structure using the intermediate methane absorption band
at 7270Angstrom .
------------------------------------------------------------------------------------
  Data Distribution

  Paper Products:  NO
  Media:           ELECTRONIC
  Blocking Factor: 10
  Ship To:         PI_Address
  Ship Via:
  Email:
------------------------------------------------------------------------------------

                                                8377(  2) - 12/18/98 16:52  - [  2]

            Summary Form for Proposal  8377

  Item                         Used in this proposal
------------------------------------------------------------------------------------------------------------------------------------
  Proposal Category            AR
------------------------------------------------------------------------------------------------------------------------------------