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Surface electrical properties experimentThe Surface Electrical Properties Experiment (SEP) was flown to the moon in December 1972 on Apollo 17 and used to explore a portion of the Taurus-Littrow region. SEP used a relatively new technique, termed radio frequency interferometry (RFI). Electromagnetic waves were radiated from two orthogonal, horizontal electric dipole antennas on the surface of the moon at frequencies of 1, 2, 4, 8, 16, and 32 Mhz. The field strength of the EM waves was measured as a function of distance with a receiver mounted on the Lunar Roving Vehicle and using three orthogonal, electrically small, loops. The interference pattern produced by the waves that travelled above the moon's surface and those that travelled below the surface was recorded on magnetic tape. The tape was returned to earth for analysis and interpretation. Several reprints, preprints, and an initial draft of the first publication of the SEP results are included. These documents provide a rather complete account of the details of the theory of the RFI technique, of the terrestrial tests of the technique, and of the present state of our interpretation of the Apollo 17 data.
Document ID
19750013120
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Simmons, G. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Date Acquired
September 3, 2013
Publication Date
March 15, 1974
Subject Category
Lunar And Planetary Exploration
Report/Patent Number
CSR-TR-74-1
NASA-CR-141724
Accession Number
75N21192
Funding Number(s)
CONTRACT_GRANT: NAS9-11540
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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