PDS: The Planetary Atmospheres NodeJovian System Data Analysis Program
Analysis ProgramCover Page/Proposal Summary
ROSS-99 NRA 99-OSS-01
Date Due: 5/5/99
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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: |
| Magnetospheric Irradiation of Europa and Io |
| Abbreviated Proposal Title: |
| Irradiation of Europa and Io |
| Principal Investigator: |
| Dr.
John Cooper Raytheon / SSDOO Project Space Physics Data Facility Code 632.0 NASA Goddard Space Flight Center Greenbelt, MD 20771 Phone: 301-286-1193 Fax: 301-286-1771 E-mail: jfcooper@pop600.gsfc.nasa.gov |
| Signature | Date |
| _____________________________________ | ____________ |
| Co-Investigators and Collaborators: | |||
| Type | Name | Affiliation | |
| Sci Co-I | Dr. Christina M. S. Cohen | California Institute of Technology | cohen@srl.caltech.edu |
| Sci Co-I | Dr. Edwin V. Bell II | Raytheon ITSS | Ed.Bell@gsfc.nasa.gov |
| Sci Co-I | Dr. Edward C. Sittler Jr. | NASA Goddard Space Flight Center | Edward.C.Sittler.1@gsfc.nasa.gov |
| Sci Co-I | Dr. Neil Gehrels | NASA Goddard Space Flight Center | gehrels@lheavx.gsfc.nasa.gov |
| Sci Collab | Dr. Barry H. Mauk | Applied Physics Lab. / Johns Hopkins Univ. | Barry_Mauk@jhuapl.edu |
| Sci Collab | Dr. Chris Paranicas | Applied Physics Lab. / Johns Hopkins Univ. | chris.paranicas@jhuapl.edu |
| Sci Collab | Dr. Robert E. Johnson | University of Virginia | rej@virginia.edu |
| Sci Collab | Dr. Robert W. Carlson | NASA Jet Propulsion Laboratory | Robert.W.Carlson@jpl.nasa.gov |
| Sci Collab | Dr. Henry B. Garrett | NASA Jet Propulson Laboratory | Henry.B.Garrett@jpl.nasa.gov |
Proposal Summary:
Accumulating magnetospheric and satellite observations of Europa and Io from the ongoing Galileo Europa Mission (GEM), and from the primary mission, now allow us to propose a focused and comprehensive effort on modeling irradiation processes on surfaces of these satellites. An unifying theme for the planetology of both of these satellites is that active resurfacing appears to be ongoing on relatively short time scales, years for discernible changes in volcanic activity on Io, and days (diurnal tide period ~ 3.5 days) to tens of millions of years (minimum total resurfacing time from cratering statistics) for Europa. Irradiation can cause significant and potentially detectable changes in surface composition and optical reflectance on all of these time scales. Our principal data sources for measurements of the magnetospheric particle environments at the orbits of these satellites include the Heavy Ion Counter (HIC) for high energy (> 6 MeV/nucleon for O and S) ion measurements and the Galileo Energetic Particle Detector (EPD) for > 20 keV ions and electrons and ions. Some members of our proposal team also have experience with analysis of Galileo and Voyager plasma ion and electron data at lower energies. Although the Galileo EPD electron response is limited at MeV energies, the available electron channels at these energies are supplemented by extended spectra to ~ 30 MeV from the Pioneer and Voyager data incorporated in the JPL Jovian radiation model of Divine and Garrett (1983). We ultimately plan to compile full particle spectra models for the satellite environments from plasma to high MeV energies. Models for the magnetic field environments of Europa and Io are now evolving and will be utilized to calculate the trajectories, flux spectra, and energy depositions of magnetospheric particles incident onto, and penetrating into, the satellite surfaces. Calculated irradiation parameters will be globally mapped for comparisons to Galileo NIMS and other compositional data.
