The HELIOS micrometeoroid experiment: Solar probe HELIOS A and B experiment 10

Physics

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Experiment Design, Helios Satellites, Interplanetary Dust, Mass Spectroscopy, Micrometeoroids, Collisional Plasmas, Coulomb Potential, Particle Mass, Time Of Flight Spectrometers, Zodiacal Light

Scientific paper

The micrometeoroid experiment on board Helios makes possible the in-situ detection of interplanetary dust particles. The experiment consists of two sensors which are inclined differently with respect to the equatorial plane of the spacecraft. It is based on the plasma production resulting from the impact of fast particles (V or=1 Km/sec) on a solid target. The instrument characteristics are discussed. Micrometeoroids are measured in the mass range from (10 to the -16) g to (10 to the -8)g and in the speed range from 2 km/sec to 50 km/sec. Additionally, the direction of impact is determined with an accuracy of + or - 60 deg. The particle charge is measured in the range from (10 to the - 14) to (10 to the -12) Coulomb. The ion composition of the impact plasma is mass analyzed with a time of flight spectrometer in the range 15 to 70 amu. The mass resolution is M/Delta M approximately 10.

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