00-042

Jovian System Data Analysis Program

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:
Thermal Emission, Eruption Style, and Eruption Evolution on Io

Abbreviated Proposal Title:
Emission, Style and Evolution of Volcanism on Io

Principal Investigator:
Dr. Ashley Davies
Jet Propulsion Laboratory ms 183-601
4800 Oak Grove Drive
Pasadena, CA 91109-8099
Phone: 818-393-1775   Fax: 818-354-0966   E-mail: agd@kookaburra.jpl.nasa.gov

SignatureDate
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Co-Investigators and Collaborators:
Type    Name    Affiliation    E-mail
Sci Collab   Dr. Laszlo P. Keszthelyi   U. Arizona/HVO   lpk@jupiter.lpl.arizona.edu
Sci Collab   Dr. John R. Spencer   Lowell Observatory   spencer@lowell.edu
Sci Collab   Dr. Larry A. Soderblom   USGS-Flagataff   lso derbl@flagmail.wr.usgs.gov


Proposal Summary:

Io is the most volcanically active body in the Solar System, and instruments on the Galileo spacecraft have provided a wealth of exciting data of thermal emission from both volcanic and non-volcanic areas of Io. We propose to analyze the Galileo Prime Mission and GEM NIMS dataset and derive the thermal structure of the volcanoes on Io's surface, determine the eruption style based on thermal signature, and chart the evolution of the individual hot spots. In doing so, we calculate Io's thermal output on different time scales ranging from minutes to years. This proposal will primarily utilize Near-Infrared Mapping Spectrometer (NIMS) data, constrained at shorter wavelengths with Solid-State Imaging experiment (SSI) data and (where possible) at longer wavelengths with Photo-Polarimeter-Radiometer (PPR) data and compared to ground-based observations The proposal concentrates on (1) deriving the thermal structure of volcanic centers on Io, constraining the thermal output of the hottest components as a function of wavelength; (2) deriving the eruption style and possible resulting geomorphologies from the evolution of hot spot thermal signature and (3) determining likely ranges of mass eruption rate, and therefore also heat transfer from the interior and global resurfacing rates. There is a final, minor, task, (4) calculating the thermal contribution of active volcanism as measured by NIMS at longer wavelengths, as a useful tool in determining the importance of active volcanism to Io's thermal budget.