Three years of Galileo dust data: II. 1993-1995

Kruger, H. and Grun, E. and Hamilton, D.P. and Baguhl, M. and Dermott, S. and Fechtig, H. and Gustafson, B.A. and Hanner, M.S. and Horanyi, M. and Kissel, J. and Lindblad, B.A. and Linkert, D. and Linkert, G. and Mann, I. and McDonnell, J.A.M. and Morfill, G.E. and Polanskey, C. and Riemann, R. and Schwehm, G. and Srama, R. and Zook, H.A. (1999) Three years of Galileo dust data: II. 1993-1995. Planetary and Space Science, 47 (1-2). pp. 85-106. ISSN 0032-0633. (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.1016/S0032-0633(98)00097-X

Abstract

Between January 1993-December 1995, the Galileo spacecraft traversed interplanetary space between Earth and Jupiter and arrived at Jupiter on 7 December 1995. The dust instrument onboard the spacecraft was operating during most of the time and data from the instrument were obtained via memory readouts which occurred at rates between twice per day and once per week. All events were classified by an onboard program into 24 categories. Noise events were usually restricted to the lowest categories (class 0). During Galileo's passage through Jupiter's radiation belts on 7 December 1995, several of the higher categories (classes 1 and 2) also show evidence for contamination by noise. The highest categories (class 3) were noise-free all the time. A relatively constant impact rate of interplanetary and interstellar (big) particles of 0.4 impacts per day was detected over the whole three-year time span. In the outer solar system (outside about 2.6 AU) they are mostly of interstellar origin, whereas in the inner solar system they are mostly interplanetary particles. Within about 1.7 AU from Jupiter intense streams of small dust particles were detected with impact rates of up to 20,000 per day whose impact directions are compatible with a Jovian origin. Two different populations of dust particles were detected in Jovian magnetosphere: small stream particles during Galileo's approach to the planet and big particles concentrated closer to Jupiter between the Galilean satellites. There is strong evidence that the dust stream particles are orders of magnitude smaller in mass and faster than the instrument's calibration, whereas the calibration is valid for the big particles. Because the data transmission rate was very low, the complete data set for only a small fraction (2525) of all detected particles could be transmitted to Earth; the other particles were only counted. Together with the 358 particles published earlier, information about 2883 particles detected by the dust instrument during Galileo's six years' journey to Jupiter is now available.

Item Type: Article
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: I.T. Ekpo
Date Deposited: 18 Jun 2009 22:17
Last Modified: 18 Jun 2009 22:17
Resource URI: http://kar.kent.ac.uk/id/eprint/16892 (The current URI for this page, for reference purposes)
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