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Calibration of the Galileo/ISPM Dust Detectors with Iron Particles

Published online by Cambridge University Press:  12 April 2016

J.R. Göller  and
E. Grün
J.R. Göller
Affiliation:
Max-Planck-Institut für Kernphysik, P.O. Box 10 39 80 D-6900 Heidelberg, W-Germany
E. Grün
Affiliation:
Max-Planck-Institut für Kernphysik, P.O. Box 10 39 80 D-6900 Heidelberg, W-Germany

Abstract

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The impact-ionization-detectors for the Galileo-/ISPM-Missions were calibrated using about 7000 iron particles with speeds between 1 km/s and 67 km/s and masses between 10−15 g and 2 × 10−10 g. These calibrations showed that the impact charge (Q) was proportional to the particle mass (m) at a fixed velocity. The speed dependent charge yield (Q/m) showed significant deviations (up to one magnitude) from a power law.

There are three independent methods (risetimes of electron and ion pulses, amplitude ratio between channeltron and ion pulse) for measuring particle speed and two possibilities (charge yields of electron and ion pulses) for mass measurement. This calibration showed that the speed can be determined within a factor of 1.2 and the mass within a factor of 2.0.

Type
II. Interplanetary Dust: Space and Ground Studies
Information
International Astronomical Union Colloquium , Volume 85: Properties and Interactions of Interplanetary Dust , 1985 , pp. 113 - 115
Copyright
Copyright © Reidel 1985

References

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