Physics
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979esasp.153...17g&link_type=abstract
In ESA Comet Halley Micrometeoroid Hazard Workshop p 17-21 (SEE N80-22200 12-91)
Physics
Halley'S Comet, Impact Damage, Meteoroid Hazards, Micrometeoroids, Particle Size Distribution, Comet Nuclei, European Space Programs, Flyby Missions, Nasa Programs, Particulates, Space Probes, Spacecraft Shielding
Scientific paper
An experiment is proposed which measures the flux, size distribution and physical characteristics of cometary particulates as a function of distance from the nucleus. It will determine the penetration depth of micrometeoroids at an impact speed of 57 km/s, the dust production rate and material properties of cometary grains. The experiment uses the micrometeoroid shield of the Halley probe as sensitive area. It will consist of a combination of several sensors: impact ionisation detectors, capacitor discharge detectors, and microphones. These different space-flight-proven detectors will have overlapping ranges of sensitivity and will cover a mass from 10 to the minus 3 power g. to approx. 10 to the minus 16th power. The signals from the impact ionization detector and the microphones depend on the mass of the impacting particles, whereas the capacitor discharge detector identifies particles above a certain threshold. The three types of detectors will be used in combination with films of different thicknesses in order to determine the penetration limit which depends on both the mass and the bulk density of the impacting particles.
Gruen Eberhard
McDonnell Anthony M. J.
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