Radiofrequency emissions observed during macroscopic hypervelocity impact experiments

Details Radiofrequency emissions observed during macroscopic hypervelocity impact experiments Radiofrequency emissions observed during macroscopic hypervelocity impact experiments

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.308..830b&link_type=abstract

Nature (ISSN 0028-0836), vol. 308, April 26, 1984, p. 830-832.

Computer Science

14

Hypervelocity Impact, Impact Tests, Projectile Cratering, Radio Emission, Rocks, Data Recording, Earthquakes, Electromagnetic Radiation, Electron Plasma, Magnetic Fields, Magnetization, Plasma Waves, Transient Response

Scientific paper

Observations of banded radiofrequency emission generated during and after macroscopic hypervelocity impacts of small projectiles on hard rocks are reported. Tests were conducted in air at atmospheric pressure and in vacuo at residual pressure varying between 6 and 0.1 torr. The receiver system consisted of several coils oriented so as to allow the simultaneous detection of various components of any transient magnetic field. The values of the recorded output frequencies varied from test to test but were generally of the same order of magnitude irrespective of ambient pressure or target material. These values are too low to have been generated in the impact-produced plasma by an oscillating dipole type of mechanism, and they cannot be due to conversion of electron plasma waves into electromagnetic waves, for reasons that are discussed. The frequencies are comparable to those observed in association with some strong earthquakes.

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