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Radio Frequencies Emitted by Mobile Granular Materials: A Basis for Remote Sensing of Sand and Dust Activity on Mars and EarthIn recent laboratory experiments, measurements were made of microsecond radio-wave (RF) bursts emitted by grains of sand as they energetically circulated in a closed, electrically ungrounded chamber. The bursts appeared to result from nanoscale electrical discharging from grain surfaces. Both the magnitude and wave form of the RF pulses varied with the type of material undergoing motion. The release of RF from electrical discharging is a well-known phenomenon, but it is generally measured on much larger energy scales (e.g., in association with lightning or electrical motors). This phenomenon might be used to detect, on planetary surfaces, the motion and composition of sand moving over dunes, the turbulent motion of fine particles in dust storms, highly-energetic grain and rock collisions in volcanic eruptions, and frictional grinding of granular materials in dry debris flows, landslides, and avalanches. The occurrence of these discharges has been predicted from theoretical considerations Additional information is contained in the original.
Document ID
20000025385
Document Type
Conference Paper
Authors
Marshall, J. (Search for Extraterrestrial Intelligence Inst. Moffett Field, CA United States)
Farrell, W. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Houser, G. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Bratton, C. (Search for Extraterrestrial Intelligence Inst. Moffett Field, CA United States)
Date Acquired
August 19, 2013
Publication Date
September 1, 1999
Publication Information
Publication: Studies of Mineralogical and Textural Properties of Martian Soil: An Exobiological Perspective
Subject Category
Lunar and Planetary Science and Exploration
Meeting Information
Lunar and Planetary Science(Houston, TX)
Funding Number(s)
CONTRACT_GRANT: NCC2-926
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.