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Cometary ion flow variations at Comet P/Halley as observed by the Giotto IMS experimentThe moments of the cometary-ion distributions are determined through a three-dimensional analysis of the Giotto IMS high-intensity spectrometer (HIS) data. The spectrometer is described, with emphasis on its angle analyzer and mass analyzer. The method of data analysis is outlined, with ion-flow vectors and temperatures being addressed. The results of the water group ion-flow profile are presented, and it is noted that, after crossing the cometopause region, the ions become gradually colder. At cometocentric distances larger than 130,000 km, the cometary-ion temperature is found to be in the area of 100 eV or higher, and derivations of the flow parameters are uncertain. The ion temperature and the flow speed become lower by about 50 eV after crossing the magnetic pile-up boundary. It is concluded that the observed velocity and temperature profiles can be explained on the basis of charge exchange processes.
Document ID
19900064163
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kettmann, G.
(Max-Planck-Inst. fuer Aeronomie Katlenburg-Lindau, Germany)
Ip, W.-H.
(Max-Planck-Institut fuer Aeronomie Katlenburg-Lindau, Federal Republic of Germany, United States)
Balsiger, H.
(Max-Planck-Inst. fuer Aeronomie Katlenburg-Lindau, Germany)
Meier, A.
(Bern, Universitaet Switzerland)
Goldstein, B. E.
(JPL Pasadena, CA, United States)
Date Acquired
August 14, 2013
Publication Date
March 1, 1990
Publication Information
Publication: Annales Geophysicae
Volume: 8
ISSN: 0992-7689
Subject Category
Astrophysics
Accession Number
90A51218
Funding Number(s)
CONTRACT_GRANT: NASW-4336
Distribution Limits
Public
Copyright
Other

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