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Measurement of Dust Electric Charges by the Ulysses and Galileo Dust Detectors

  • J. Svestka (a1), S. Auer (a1), M. Baguhl (a1) and E. Grün (a1)

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The Galileo and Ulysses dust detectors can detect electric charges of dust particles. Dust particles entering the sensor (see, e.g., Grün et al. 1992) may be detected by the charge Qp that they induce to the charge grid. All suitably massive dust particles - charged or uncharged - are then detected by the cloud of ions and electrons they produce during the impact on the hemispherical target after the time of flight between the charge grid and the target. After separation in the electric field, ions and electrons are collected by separate electrodes and produce two pulses of opposite polarity. From the two pulse heights and the rise times, the mass and impact speed of the dust particle are derived.

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References

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Grün, et al. 1992, Astron. Astrophys. Suppl. Ser. 92, 411
Leinert, Ch. and E., Grün 1990, in Physics of the Inner Heliosphere I, R. Schwenn & E. Marsch, Berlin Heidelberg: Springer-Verlag, 207
Mendis, D.A. 1981, in Investigating the Universe, Kahn, F.D., Dordrecht: Reidel, 353
Mukai, T. 1991, in Origin and Evolution of Interplanetary Dust, Levasseu-Regourd, A.C. & H. Hasegawa, Dordrecht: Kluwer, 371

Measurement of Dust Electric Charges by the Ulysses and Galileo Dust Detectors

  • J. Svestka (a1), S. Auer (a1), M. Baguhl (a1) and E. Grün (a1)

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