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| Max-Planck Forschungsberichte (laufend) |
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Forschungsbericht 200642-14
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Aus den Highlights 42/2006:
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Galileo dust data from the jovian system: 1997-1999
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The dust detector system on board the Galileo spacecraft recorded dust impacts in circumjovian space during the craft's orbital mission about Jupiter. This is the eighth in a series of papers dedicated to presenting Galileo and Ulysses dust data. We present data from the Galileo dust instrument for the period January 1997-December 1999 when the spacecraft completed 21 revolutions about Jupiter. In this time interval data were obtained as high resolution realtime science data or recorded data during 449 days (representing 41% of the entire period), or via memory readouts during the remaining times. Because the data transmission rate of the spacecraft was very low, the complete data set (i.e. all parameters measured by the instrument during impact of a dust particle) of only 3% (7625) of all particles detected could be transmitted to Earth; the other particles were only counted. Together with the data of 2883 particles detected during, Galileo's interplanetary cruise and 53 53 particles detected in the jovian system in 1996, complete data of 15 861 particles detected by the Galileo dust instrument from 1989 to 1999 are now available. The majority of the detected particles were tiny grains (about 10 nm in radius), most of them originating from Jupiter's innermost Galilean moon Io. They were detected throughout the jovian system and the highest impact rates exceeded 100 min(-1) (C21 orbit; 01 July 1999). With the new data set the times of onset, cessation and a 180 degrees shift in the impact direction of the grains measured during 19 Galileo orbits about Jupiter are well reproduced by simulated 9 nm particles charged up to a potential of +3 V, confirming earlier results obtained for only two Galileo orbits (Horanyi, M., Grun, E., Heck, A., 1997. Modeling the Galileo dust measurements at Jupiter. Geophys. Res. Lett. 24, 2175-2178). Galileo has detected a large number of bigger particles mostly in the region between the Galilean moons. The average radius of 370 of these grains measured in the 1996-1999 period is about 2 mu m (assuming spherical grains with density 1 g cm(-3)) and the size distribution rises steeply towards smaller grains. The biggest detected particles have a radius of about 10 mu m. (c) 2006 Elsevier Ltd. All rights reserved.
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Autoren
Kruger H. Bindschadler D. Dermott SF. Graps AL. Grun E. Gustafson BA. Hamilton DP. Hanner MS. Horanyi M. Kissel J. Lindblad BA. Linkert D. Linkert G. Mann I. McDonnell JAM. Moissl R. Morfill GE. Polanskey C. Schwehm G. Srama R. Zook HA.
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Titel
Galileo dust data from the jovian system: 1997-1999
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Quelle
Planetary & Space Science. 54(9-10):879-910, 2006 Aug.
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ISSN
0032-0633
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KeyWords Plus
Planetary satellites, Interstellar dust, Ulysses, Streams, Magnetosphere, Detector, Clouds, Interplanetary, Jupiter, Grains.
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Forschungsgebiet
Astronomie/Astrophysik
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Art der Ver�fentlichung
Article
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Institution
Kruger H Max Planck Inst Sonnensystemforsch D-37191 Katlenburg Lindau Germany Max Planck Inst Sonnensystemforsch D-37191 Katlenburg Lindau Germany CALTECH, Jet Prop Lab Pasadena, CA 91109 USA Univ Florida Gainesville, FL 32609 USA Ist Fis Spazio Interplanetario, INAF, ARTOV I-00133 Rome Italy Max Planck Inst Kernphys D-69029 Heidelberg Germany Hawaii Inst Geophys & Planetol Honolulu, HI 96822 USA Univ Maryland College Pk, MD 20742 USA Univ Colorado, Atmospher & Space Phys Lab Boulder, CO 80309 USA Lund Observ S-221 Lund Sweden Univ Munster, Inst Planetol D-48149 Munster Germany Open Univ, Planetary & Space Sci Res Inst Milton Keynes MK7 6AA Bucks England Max Planck Inst Extraterr Phys D-85748 Garching Germany Estec NL-2200 AG Noordwijk Netherlands NASA, Lyndon B Johnson Space Ctr Houston, TX 77058 USA
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ISI Accession Number
088BJ-0004
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