Computer Science
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000came.work..132g&link_type=abstract
Concepts and Approaches for Mars Exploration, p. 132
Computer Science
Mars Exploration, Electromagnetic Measurement, Magnetometers, Antennas, Dielectrics, Water Depth, Magnetic Properties, Electrical Resistivity, Mars Surface, Electrical Impedance
Scientific paper
Subsurface saline water is a near-ideal low-frequency electromagnetic (EM) exploration target due to its high electrical conductivity. For liquid water at depths up to several km on Mars, frequencies of 10 Hz to 1 kHz are highly diagnostic of the depth to this conductor. Both lower and higher frequencies contain information about the presence and depth to water, but require independent conductivity estimates. The dielectric-relaxation signature of ice at 1-10 kHz is subtle. Abundant natural EM sources probably exist for Mars, obviating the need for transmitters. These include solar heating of the ionosphere, interaction of the solar wind, ionosphere, and crustal magnetism, and lightning. Surface measurements can be made at multiple locations with magnetometers only, or at a single location by recording both the electric and magnetic fields. A new generation of solid-state magnetometers and high-impedance antennae can provide these measurements compactly.
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