Database: Ace Shock Analysis
Event ID: 19982911900
Observation time: 10/18/1998 291.79223 1900 [UT]
|
|
General
Information (About, Top)
| Year |
1998 |
| Fractional day of year |
291.792234 |
| Arrival time of shock [seconds of day] |
68449.0 ± 16.0 |
| Shock type |
FF |
| Electron data availability |
0 |
X GSE location of spacecraft [Re] |
0.036 |
| Y GSE location of spacecraft [Re] |
-0.006 |
| Z GSE location of spacecraft [Re] |
-0.001 |
| Upstream plasma points selected for analysis |
0010 |
| Upstream field points selected for analysis |
0043 |
| Downstream plasma points selected for analysis |
0010
|
| Downstream field points selected for analysis |
0040 |
| Minimum chisq/dof for RH8,RH9,RH10 |
11.34, 41.91, 42.40 |
Event added to database
|
Sat Apr 30 21:43:16 2005
|
Event last processed
|
Wed Oct 15 14:43:02 2014
|
Method selected
|
RH08
|
Propagation delay to Earth [minutes]
|
0.009 ± 0.002
|
Asymptotic
plasma
parameters (About, Top)
|
Parameter
|
Upstream
|
Downstream
|
| Vx GSE [km/s] |
-319.9 ± 0.9 |
-352.9 ± 1.6 |
| Vy GSE [km/s] |
9.8 ± 1.4 |
5.1 ± 1.6 |
| Vz GSE [km/s] |
-1.8 ± 1.6 |
-41.1 ± 1.4 |
| Wi [km/s] |
22.6 ± 0.7 |
25.7 ± 1.5 |
| We [km/s] |
715.1 ± 21.0 |
814.1 ± 46.2 |
| Ni [n/cc] |
17.8 ± 1.3 |
44.9 ± 4.5 |
| Bx GSE [nT] |
4.1 ± 0.2 |
6.9 ± 0.6 |
| By GSE [nT] |
-1.9 ± 0.2 |
-4.2 ± 0.5 |
| Bz GSE [nT] |
-0.2 ± 0.2 |
-3.0 ± 1.1 |
Plasma Beta
|
0.959 ± 0.987
|
0.884 ± 0.960
|
Sound Speed [km/s]
|
29.18 ± 0.84
|
33.23 ± 1.89
|
Alfven Speed [km/s]
|
23.18 ± 1.19
|
28.02 ± 3.50
|
Best values of
shock
front normal for each method (About, Top)
| Method |
Nx |
Ny |
Nz |
Theta [degrees] |
Phi [degrees] |
| MC |
-0.754 ± 0.122 |
0.034 ± 0.249 |
-0.656 ± 0.540 |
-40.98 ± 10.58 |
177.44 ± 18.88 |
| VC |
-0.641 ± 0.034 |
-0.092 ± 0.038 |
-0.762 ± 0.561 |
-49.63 ± 2.53 |
188.12 ± 3.39 |
| MX1 |
-0.716 ± 0.056 |
-0.038 ± 0.097 |
-0.697 ± 0.553 |
-44.20 ± 4.57 |
183.04 ± 7.78 |
| MX2 |
-0.715 ± 0.058 |
-0.042 ± 0.094 |
-0.698 ± 0.553 |
-44.23 ± 4.71 |
183.39 ± 7.56 |
| MX3 |
-0.715 ± 0.059 |
-0.045 ± 0.094 |
-0.698 ± 0.553 |
-44.28 ± 4.86 |
183.57 ± 7.54 |
| RH08 |
-0.824 ± 0.006 |
-0.051 ± 0.007 |
-0.564 ± 0.495 |
-34.35 ± 0.63 |
183.51 ± 0.50 |
| RH09 |
-0.999 ± 0.003 |
-0.044 ± 0.070 |
-0.006 ± 0.006 |
-0.32 ± 3.62 |
182.51 ± 3.99 |
| RH10 |
-0.999 ± 0.003 |
-0.044 ± 0.069 |
-0.006 ± 0.006 |
-0.32 ± 3.74 |
182.51 ± 3.97 |
| Average |
-0.795 |
-0.040 |
-0.511 |
-32.290 |
183.011 |
| Median |
-0.716 |
-0.044 |
-0.656 |
-40.984 |
183.392 |
| Deviation |
0.136 |
0.034 |
0.317 |
20.189 |
2.888 |
Key shock
parameters (About, Top)
| Method |
ThetaBn |
Shock Speed |
Compression |
| MC |
48.2 ± 1.6 |
327.0 ± 0.6 |
2.49 ± 0.25 |
| VC |
59.5 ± 1.6 |
291.4 ± 0.6 |
2.49 ± 0.25 |
| MX1 |
53.1 ± 1.6 |
315.2 ± 0.6 |
2.49 ± 0.25 |
| MX2 |
53.3 ± 1.6 |
315.0 ± 0.6 |
2.49 ± 0.25 |
| MX3 |
53.4 ± 1.6 |
314.7 ± 0.6 |
2.49 ± 0.25 |
| RH08 |
45.7 ± 1.5 |
347.0 ± 0.6 |
2.49 ± 0.25 |
| RH09 |
27.9 ± 3.1 |
374.9 ± 0.5 |
2.49 ± 0.25 |
| RH10 |
27.9 ± 3.1 |
374.9 ± 5.1 |
2.49 ± 0.25 |
| Average |
46.1 |
332.5 |
2.49 |
| Median |
53.1 |
327.0 |
2.49 |
| Deviation |
12.0 |
30.3 |
0.00 |
Upstream wave speeds
and
mach numbers (About, Top)
|
Method
|
dV
|
Slow
|
Intermediate
|
Fast
|
Slow
Mach
|
Fast
Mach
|
| MC |
84.2 ± 1.2 |
12.9 ± 0.4 |
15.5 ± 0.8 |
35.0 ± 0.9 |
6.54 ± 0.18 |
2.41 ± 0.05 |
| VC |
85.9 ± 1.3 |
9.5 ± 0.3 |
11.8 ± 0.6 |
36.1 ± 0.9 |
9.03 ± 0.24 |
2.38 ± 0.05 |
| MX1 |
85.3 ± 1.2 |
11.4 ± 0.4 |
13.9 ± 0.7 |
35.5 ± 0.9 |
7.47 ± 0.20 |
2.41 ± 0.05 |
| MX2 |
85.4 ± 1.2 |
11.4 ± 0.4 |
13.9 ± 0.7 |
35.5 ± 0.9 |
7.50 ± 0.20 |
2.40 ± 0.05 |
| MX3 |
85.4 ± 1.2 |
11.3 ± 0.4 |
13.8 ± 0.7 |
35.5 ± 0.9 |
7.53 ± 0.20 |
2.40 ± 0.05 |
| RH8 |
82.9 ± 1.1 |
13.6 ± 0.5 |
16.2 ± 0.8 |
34.7 ± 0.8 |
6.10 ± 0.17 |
2.39 ± 0.05 |
| RH9 |
55.6 ± 0.9 |
18.4 ± 0.7 |
20.5 ± 1.1 |
32.4 ± 0.8 |
3.02 ± 0.12 |
1.72 ± 0.04 |
| RH10 |
55.6 ± 0.9 |
18.4 ± 0.7 |
20.5 ± 1.1 |
32.4 ± 0.8 |
3.02 ± 0.12 |
1.72 ± 0.04 |
| Average |
77.5 |
13.4 |
15.7 |
34.6 |
6.3 |
2.2 |
| Median |
85.3 |
12.9 |
15.5 |
35.5 |
7.5 |
2.4 |
| Deviation |
13.6 |
3.3 |
3.2 |
1.4 |
2.2 |
0.3 |
Downstream wave speeds
and
mach numbers (About, Top)
|
Method
|
dV
|
Slow
|
Intermediate
|
Fast
|
Slow
Mach
|
Fast
Mach
|
| MC |
33.9 ± 0.9 |
15.1 ± 1.1 |
18.7 ± 2.3 |
40.9 ± 2.2 |
2.25 ± 0.13 |
0.83 ± 0.04 |
| VC |
34.5 ± 0.9 |
11.2 ± 0.8 |
14.2 ± 1.8 |
42.1 ± 2.3 |
3.10 ± 0.16 |
0.82 ± 0.04 |
| MX1 |
34.3 ± 0.9 |
13.4 ± 1.0 |
16.8 ± 2.1 |
41.5 ± 2.2 |
2.56 ± 0.14 |
0.83 ± 0.04 |
| MX2 |
34.3 ± 0.9 |
13.4 ± 1.0 |
16.8 ± 2.1 |
41.5 ± 2.2 |
2.57 ± 0.14 |
0.83 ± 0.04 |
| MX3 |
34.3 ± 0.9 |
13.3 ± 1.0 |
16.7 ± 2.1 |
41.5 ± 2.2 |
2.58 ± 0.14 |
0.83 ± 0.04 |
| RH8 |
33.4 ± 1.0 |
16.0 ± 1.2 |
19.6 ± 2.4 |
40.5 ± 2.2 |
2.10 ± 0.13 |
0.83 ± 0.04 |
| RH9 |
22.3 ± 1.6 |
21.7 ± 1.7 |
24.8 ± 3.1 |
37.8 ± 1.9 |
1.03 ± 0.10 |
0.59 ± 0.05 |
| RH10 |
22.3 ± 1.6 |
21.7 ± 1.7 |
24.8 ± 3.1 |
37.8 ± 1.9 |
1.03 ± 0.10 |
0.59 ± 0.05 |
| Average |
31.2 |
15.7 |
19.0 |
40.4 |
2.2 |
0.8 |
| Median |
34.3 |
15.1 |
18.7 |
41.5 |
2.6 |
0.8 |
| Deviation |
5.5 |
3.9 |
3.9 |
1.7 |
0.8 |
0.1 |
Survey interval (About, Top)
Selected
data (About, Top)
|
Key plasma parameters
|
Velocity
|
Magnetic Field
|
Simple
Methods
(About, Top)
Rankine Chi^2
Contour (About, Top)
Shock
Speed (About, Top)
Theta Bn (About, Top)
Mach Numbers (About, Top)
Page updated Mon Apr 13 08:55:21 2009
Michael L Stevens
(mstevens@cfa.harvard.edu)
| 
