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Proposal Identication No.: Solar SystemR1333 Date Received: 2000-99-May-28 19:13:53
Technical Page
Proposal Type: Long-term
General Category: Astronomy
Sub-Category: Solar System
Sub-Category: Solar System
Observation Category:
Total Time Requested: 126 Hours
Proposal Title: Radar Observations of the Galilean Satellites
ABSTRACT:
Speculation that Europa and Callisto possess liquid water under an icy lithosphere has greatly increased interest
in the Galilean satellites of Jupiter. Lack of impact craters suggests that Europa's surface is relatively young, and
perhaps tectonically active. Dual-polarization radar mapping using the recently upgraded Arecibo system will
oer new and unique constraints on candidate resurfacing processes. We propose a series of 12.6 cm
coded-long-pulse and 70 cm CW observations during the 1999 and 2000 Jupiter oppositions. Range-resolved
measurements will constrain the geographic distribution of scatterers, and multi-wavelength measurements will
constrain ice absorption and be indicative of lossy materials. The observations are part of a campaign to observe
Europa, Ganymede, and Callisto at three dierent wavelengths at both Arecibo and Goldstone.
Name Institution E-mail Phone Student
Leif J. Harcke Stanford University lharcke@leland.stanford.edu 650-725-1638 G
I NA want to do remote observing.
Instrument Setup
430 G S-Band radar 430 CH receiver 430 CH radar S-band receiver
Atmospheric Optical Instruments:
Special Equipment or setup: Coded-long-pulse hardware PN code generator and corresponding
analysis software. Frequency switch capability as in previous CW observations of the Galilean satellites,
and corresponding data reduction software.
RFI Considerations
Frequency Ranges Planned
not given
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