Plasma production by secondary impacts - implications for velocity-measurements by in-situ dust detectors

Ratcliff, P.R. and Gogu, F. and Grun, E. and Srama, Ralf (1995) Plasma production by secondary impacts - implications for velocity-measurements by in-situ dust detectors. In-Situ Impact Detection Techniques, Interplanetary Dust, And Future Mars Exploration, 17 (12). pp. 111-115. ISSN 0273-1177 . (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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A number of in-situ cosmic dust detectors derive the dust particle velocities from measurement of the risetimes of the impact plasma signal. Extensive calibration of these instruments has established a reliable empirical relationship but a quantitative explanation has not been available, with the result that confidence in flight data outside the range of the calibration data is hard to assess. Recent measurements taken at the dust accelerator facilities at the University of Kent (UK) and at MPI-K (Germany), supported by a theoretical analysis, have demonstrated that the relationship results from the time-spread of secondary impacts coupled with the mobility of ions in the impact plasma cloud, which is in rum determined by the magnitude and geometry of the applied electric field and on the ion species present Results of the current investigations are presented, and the implications of measurements based on this principle at high particle velocities, at masses unobtainable in calibration studies, and for other instrument geometries, are considered.

Item Type: Article
Additional information: Document Type: Proceedings Paper. Conference Information: B1 Symposium and B1.1, B1.3 Meetings of COSPAR Scientific Commission B, at the 13th COSPAR Scientific Assembly HAMBURG, GERMANY, JUL 11-21, 1994 Comm Space Res
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Engineering and Digital Arts
Depositing User: O.O. Odanye
Date Deposited: 28 May 2009 16:07
Last Modified: 18 Jul 2014 08:37
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