00-036

Jovian System Data Analysis Program

Cover Page/Proposal Summary

ROSS-99    NRA 99-OSS-01

Date Due: 5/5/99

NASA PROCEDURE FOR HANDLING PROPOSALS

This proposal shall be used and disclosed for evaluation purposes only, and a copy of this Government notice shall be applied to any reproduction or abstract thereof. Any authorized restrictive notices that the submitter places on this proposal shall also be strictly complied with. Disclosure of this proposal for any reason outside the Government evaluation purposes shall be made only to the extent authorized by the Government.

Proposal Type: New Proposal

Proposal Category: Satellites and Rings

Major Equipment Proposal? No

Do you intend to submit an Education/Public Outreach (E/PO) proposal? No

Proposal Title:
Jovian Satellite and Atmosphere Studies using GEM Data

Abbreviated Proposal Title:
GEM Satellite and Atmosphere Studies

Principal Investigator:
Dr. Robert Carlson
Earth and Space Sciences Division Mail Stop 183-601
Jet Propulsion Lab.
4800 Oak Grove Drive
Pasadena, CA 91109-8099
Phone: 818-354-2648   Fax: 818-393-3218   E-mail: rcarlson@issac.jpl.nasa.gov

SignatureDate
_________________________________________________

Co-Investigators and Collaborators:
NONE



Proposal Summary:

The Galileo GEM data, primarily those from the Near Infrared Mapping Spectrometer but also including data obtained by the Ultraviolet Spectrometer and Solid State Imager, will be be used to study the Jovian aurora, satellite atmospheres, surface composition of the satellites, and the crystal state of surface ice on Europa. The jovian auroral studies will include determination of the altitude of the infrared aurora (from jovian limb scans) and relationships to the visible and UV aurora. Satellite atmosphere studies are prompted by the discovery of a carbon dioxide atmosphere on Callisto. These studies will continue using spectra for other molecules (H2O, CO, OH, etc.) for Callisto and other galilean satellites. Surface hydrate materials, including newly-identified sulfuric acid hydrate, will be globally mapped for comparison to IR and UV sulfur dioxide determinations. The phase-angle scattering function of Europa, determined from GEM measurements, will be used do determine the relative abundance of hexagonal, cubic, and amorphous ice.