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14
Normalized ion density (log10)
Normalized ion pressure (log10)
Ion Mack number
IMF magnitude
12
10
8
6
4
2
0
-2
-8
-6
-4
-2
0
2
4
6
8
R c (log10(km))
Fig. 5. Plasma parameters along the Sun-Comet line. Both variables and distances
are logarithmic. The ion mass density and pressure and IMF magnitude are normalized
compared to the values in the unperturbed solar wind. The Sun is along the X> 0axis.
interaction with the contaminated solar wind stream at the contact surface.
The position of the bow shock and the inner shock are in a good agreement
with Gombosi et al. and Schmidt-Voigt numerical models. 18 , 19
We also estimated the position of the bow shock and the contact surface
along the inbound Giotto trajectory to be, respectively,
R b =1 . 3
10 6 km
and R i = 4,300 km. These values are very close to the values derived from
the data of the RPA-COPERNIC and the GIOTTO-MAG instruments
( R b =1 . 15
×
R i = 4,660 km) reported by Reme and Neubauer
10 6 km and
×
in their publications. 20 , 21
Figure 6 presents a cross section along the the Sun-Comet line of the
ion temperature, the thermal electron temperature and the neutral tem-
perature. This profile gives a clear idea of the cooling effect affecting the
electrons in the inner coma du to rotational, vibrational, and electronic
excitation of water vapor.
Currently, we are adjusting the CASIM3D free parameters to better
fit Giotto data. Deeper analysis of the resulting model and comparison
of all the fluid parameters with the available Halley's flybys data are in
preparation. We will account of these results in a future publication.
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