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Ion emission line profiles in cometary plasma tails

Rauer, H. and Roesler, F. and Scherb, F. and Schmidt, H.U. and Wegmann, R. (1997) Ion emission line profiles in cometary plasma tails. Astronomy and Astrophysics, 325, pp. 839-846.

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Abstract

We present a first attempt to model the profile of ion emission lines in a cometary plasma tail with the aid of a 3D-MHD model of the comet-solar wind interaction, and to compare the calculated line profiles to high-resolution measurements of the H_2_O^+^ doublet at 6159Å in comet 1P/Halley on January 6, 1986. The modelled line profiles are asymmetric and show a high velocity wing originating from fast ions in the outer parts of the tail along the line-of-sight. Comparison with the measured profiles shows that such high-velocity wings are indeed observed and are needed to fully approximate the observed profiles. We performed a quantitative analysis of the contribution of fast ions to the ion flow to examine if they are really sufficient to explain the discrepancy between measured H_2_O^+^ production rates and the rates expected from photoionization of water. It is found that the combined effect of fast ions and the limited field-of-view can indeed reduce the measured flux. However, the reduction seems not be sufficient to explain the whole discrepancy.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2004,
Title:Ion emission line profiles in cometary plasma tails
Authors:
AuthorsInstitution or Email of Authors
Rauer, H.UNSPECIFIED
Roesler, F.University of Wisconsin, USA
Scherb, F.University of Wisconsin, USA
Schmidt, H.U.MPI für Astrophysik, Germany
Wegmann, R.MPI für Astrophysik, Germany
Date:1997
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:325
Page Range:pp. 839-846
Status:Published
Keywords:Comets: general, Comets: 1P/Halley
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):UNSPECIFIED
Location: Berlin-Adlershof
Institutes and Institutions:Institut für Weltraumsensorik und Planetenerkundung
Deposited By: Susanne Pieth
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 19:36

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