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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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.
|Title:||Ion emission line profiles in cometary plasma tails|
|Journal or Publication Title:||Astronomy and Astrophysics|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 839-846|
|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|
|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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