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The ion population between 1300 km and 230000 km in the coma of comet P/HalleyDuring the encounter of the spacecraft Giotto with Comet Halley the two sensors of the ion mass spectrometer (IMS), high energy range spectrometer (HERS) and high intensity spectrometer (HIS), measured the mass and the three-dimensional velocity distributions of cometary ions. HIS looked mainly at the cold, slow part of the distribution close to the nucleus, HERS at the more energetic pick-up ions further out. After a thorough recalibration of the HIS flight spare unit and an extensive data analysis we present here continuous ion density-, composition-, velocity-, and temperature profiles for the water group ion (mass range 16-19 amu/e) along Giotto's inbound trajectory from 230,000 to 1300 km from the comet nucleus. The two sensors are in very good agreement in the region where their measurements overlap thus giving an excellent data base for the discussion of theoretical comet models. The most prominent feature where models and observations disagree is the so called pile up region between 8000 and 15,000 km from the nucleus.
Document ID
19950043322
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Altwegg, K.
(Univ. of Bern Bern, Switzerland)
Balsiger, H.
(Univ. of Bern Bern, Switzerland)
Geiss, J.
(Univ. of Bern Bern, Switzerland)
Goldstein, R.
(Jet Propulsion Lab. Cal. Inst. of Tech., Pasadena, CA, United States)
Ip, W. -H.
(Max-Planck-Inst. fuer Aeronomie Katlenburg-Lindau, Germany)
Meier, A.
(Univ. of Bern Bern, Switzerland)
Neugebauer, M.
(Jet Propulsion Lab. Cal. Inst. of Tech., Pasadena, CA, United States)
Rosenbauer, H.
(Max-Planck-Inst. fuer Aeronomie Katlenburg-Lindau, Germany)
Shelley, E.
(Lockheed Palo Alto Research Lab. Palo Alto, CA, United States)
Date Acquired
August 16, 2013
Publication Date
November 1, 1993
Publication Information
Publication: Astronomy and Astrophysics
Volume: 279
Issue: 1
ISSN: 0004-6361
Subject Category
Astronomy
Accession Number
95A74921
Distribution Limits
Public
Copyright
Other

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