کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8137266 | 1523542 | 2015 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ionization balance in Titan's nightside ionosphere
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
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چکیده انگلیسی
Based on a multi-instrumental Cassini dataset we make model versus observation comparisons of plasma number densities, nPÂ =Â (nenI)1/2 (ne and nI being the electron number density and total positive ion number density, respectively) and short-lived ion number densities (N+, CH2+, CH3+, CH4+) in the southern hemisphere of Titan's nightside ionosphere over altitudes ranging from 1100 and 1200Â km and from 1100 to 1350Â km, respectively. The nP model assumes photochemical equilibrium, ion-electron pair production driven by magnetospheric electron precipitation and dissociative recombination as the principal plasma neutralization process. The model to derive short-lived-ion number densities assumes photochemical equilibrium for the short-lived ions, primary ion production by electron-impact ionization of N2 and CH4 and removal of the short-lived ions through reactions with CH4. It is shown that the models reasonably reproduce the observations, both with regards to nP and the number densities of the short-lived ions. This is contrasted by the difficulties in accurately reproducing ion and electron number densities in Titan's sunlit ionosphere.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 248, 1 March 2015, Pages 539-546
Journal: Icarus - Volume 248, 1 March 2015, Pages 539-546
نویسندگان
E. Vigren, M. Galand, R.V. Yelle, A. Wellbrock, A.J. Coates, D. Snowden, J. Cui, P. Lavvas, N.J.T. Edberg, O. Shebanits, J.-E. Wahlund, V. Vuitton, K. Mandt,