Table 1:
Results from fitting of the geometrical and physical
parameters for the magnetic cloud of October 18-20, 1995, choosing the
end time as 20-October-1995 00:00 UT (i.e., at t=29 in
Figs. 2, 3, 5).
The first four rows correspond to the orientation given by the
minimum variance method (MV, Sect. 4.2), while the next
four to a simultaneous fit (SF, Sect. 4.3). The next two rows are the mean and
the maximum deviation from the mean of the parameters
found with the eight above models and methods. The bottom three rows
give the results of the direct method for the in-bound and out-bound parts of
the flux rope, and the full back part of the MC (see
Sect. 5.4). L, G, H, C refer to
the Lundquist, Gold-Hoyle, Hidalgo et al. and Cid et al. models,
respectively, and D to the direct method. The geometrical parameters
are: the angle (
)
between the axis of the tube and the
ecliptic plane (i.e., its latitude), the angle (
)
between the
projection of the cloud axis on the ecliptic plane and
the x-axis of GSE (i.e., its longitude), the flux tube radius (R), and the impact
parameter (p) measured in units of R. The two physical parameters
of the models are: the twist angle per unit length (
)
and the
intensity of the field (B0), both computed at the cloud axis. The
quality of the fitting is given by the square root of 
(Eq. (16)). Finally, we give the axial magnetic flux (Fz) and quantities defined per unit length along the cloud axis:
the azimuthal magnetic flux and magnetic helicity (
and H/L).
|
Model |
|
|
R |
p/R |
|
B0 |
 |
Fz |
|
H/L |
| -Method |
|
|
AU |
|
AU-1 |
nT |
nT |
1021 Mx |
1021 Mx/AU |
1042 Mx2/AU |
| L-MV |
-2 |
288 |
0.13 |
0 |
9.6 |
24.3 |
8.1 |
1.15 |
2.98 |
4.6 |
| G-MV |
-2 |
288 |
0.13 |
0 |
14.9 |
26.0 |
8.7 |
1.32 |
3.06 |
4.1 |
| H-MV |
-2 |
288 |
0.13 |
0 |
9.0 |
22.6 |
6.3 |
0.94 |
3.87 |
5.3 |
| C-MV |
-2 |
288 |
0.13 |
0 |
11.4 |
17.9 |
6.1 |
1.12 |
3.88 |
6.0 |
| L-SF |
5 |
288 |
0.13 |
0.11 |
9.5 |
24.9 |
7.4 |
1.20 |
3.05 |
4.9 |
| G-SF |
4 |
295 |
0.13 |
0.03 |
15.4 |
26.4 |
8.0 |
1.23 |
3.11 |
3.7 |
| H-SF |
4 |
285 |
0.14 |
0.12 |
8.4 |
23.9 |
5.5 |
1.03 |
4.43 |
6.0 |
| C-SF |
4 |
289 |
0.13 |
0.09 |
11.1 |
18.4 |
5.4 |
1.14 |
3.88 |
6.1 |
| mean |
1 |
289 |
0.13 |
0.04 |
11.2 |
23.1 |
|
1.14 |
3.53 |
5.1 |
| deviat. |
4 |
6 |
0.01 |
0.08 |
4.2 |
5.2 |
|
0.20 |
0.90 |
1.2 |
| D-MV in |
-2 |
288 |
0.13 |
0 |
|
|
|
0.86 |
2.50 |
2.6 |
| D-MV out |
-2 |
288 |
0.13 |
0 |
|
|
|
0.51 |
2.50 |
1.3 |
| D-MV back |
-2 |
288 |
0.13 |
0 |
|
|
|
0.68 |
5.80 |
5.4 |
Source LaTeX |
All tables |
In the text