Geoscience Reference
In-Depth Information
7
Ion Temperature
Thermal electron temperature
6
5
4
3
2
1
-8
-6
-4
-2
0
2
4
6
8
R
c
(log10(km))
Fig. 6. Ion and thermal electron temperature along the Sun-Comet line. Both variables
and distances are logarithmic. Note the electron cooling effect in the inner coma due to
the Electronic, variational, and rotation excitation of water vapor. The Sun is along the
X>
0axis.
4. Conclusion
In this work we present few results of the our 3-D multi-fluid model
of a Halley-type comet. The results show a good agreement with the
expected fluid boundaries found by other teams, and early their analy-
sis agrees with the Giotto data gathered during the Halley's flyby. We have
demonstrated the capability of CASIM3D as a multi-fluid MHD model
that not only derives the ions parameters, but also computes the thermal
and supra-thermal electron distributions and temperatures and the neutral
parameters. Deeper analysis and comparison with theoretical models and
experimental data are in process and will be released in future publications.
Acknowledgments
The work presented herein has been funded by the National Academies
and by NASA Goddard Space Flight Center. Calculations were carried
out on the high-performance computing resources of the NASA Center for
Computational Sciences.
