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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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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