Database: Ace Shock Analysis
Event ID: 19990420748
Observation time: 02/11/1999 42.32541 0748 [UT]
|
|
General
Information (About, Top)
| Year |
1999 |
| Fractional day of year |
42.325405 |
| Arrival time of shock [seconds of day] |
28115.0 ± 16.0 |
| Shock type |
FF |
| Electron data availability |
0 |
X GSE location of spacecraft [Re] |
0.038 |
| Y GSE location of spacecraft [Re] |
0.001 |
| Z GSE location of spacecraft [Re] |
0.004 |
| Upstream plasma points selected for analysis |
0009 |
| Upstream field points selected for analysis |
0039 |
| Downstream plasma points selected for analysis |
0009
|
| Downstream field points selected for analysis |
0036 |
| Minimum chisq/dof for RH8,RH9,RH10 |
4.07, 17.75, 18.12 |
Event added to database
|
Sat Apr 30 21:43:38 2005
|
Event last processed
|
Wed Oct 15 14:49:48 2014
|
Method selected
|
RH08
|
Propagation delay to Earth [minutes]
|
0.009 ± 0.000
|
Asymptotic
plasma
parameters (About, Top)
|
Parameter
|
Upstream
|
Downstream
|
| Vx GSE [km/s] |
-374.9 ± 1.7 |
-402.7 ± 1.9 |
| Vy GSE [km/s] |
-0.3 ± 1.3 |
-4.7 ± 1.2 |
| Vz GSE [km/s] |
-5.7 ± 1.0 |
-3.2 ± 2.4 |
| Wi [km/s] |
22.9 ± 0.9 |
28.4 ± 0.6 |
| We [km/s] |
723.0 ± 28.0 |
897.2 ± 20.5 |
| Ni [n/cc] |
12.5 ± 0.8 |
24.7 ± 1.0 |
| Bx GSE [nT] |
3.0 ± 0.2 |
3.5 ± 0.1 |
| By GSE [nT] |
-3.0 ± 0.2 |
-4.7 ± 0.4 |
| Bz GSE [nT] |
-0.6 ± 0.2 |
-0.2 ± 0.2 |
Plasma Beta
|
0.763 ± 0.735
|
1.283 ± 1.231
|
Sound Speed [km/s]
|
29.44 ± 1.20
|
36.70 ± 0.84
|
Alfven Speed [km/s]
|
26.17 ± 1.08
|
25.14 ± 0.79
|
Best values of
shock
front normal for each method (About, Top)
| Method |
Nx |
Ny |
Nz |
Theta [degrees] |
Phi [degrees] |
| MC |
-0.867 ± 0.163 |
-0.066 ± 0.178 |
0.494 ± 0.449 |
29.63 ± 18.87 |
184.36 ± 11.76 |
| VC |
-0.984 ± 0.013 |
-0.156 ± 0.061 |
0.091 ± 0.091 |
5.21 ± 5.46 |
189.04 ± 3.55 |
| MX1 |
-0.965 ± 0.042 |
-0.249 ± 0.161 |
0.083 ± 0.082 |
4.74 ± 5.66 |
194.47 ± 9.58 |
| MX2 |
-0.965 ± 0.042 |
-0.246 ± 0.159 |
0.091 ± 0.091 |
5.22 ± 5.62 |
194.30 ± 9.45 |
| MX3 |
-0.965 ± 0.040 |
-0.240 ± 0.155 |
0.109 ± 0.108 |
6.25 ± 6.24 |
193.98 ± 9.18 |
| RH08 |
-0.997 ± 0.001 |
-0.079 ± 0.009 |
0.028 ± 0.028 |
1.60 ± 0.77 |
184.51 ± 0.54 |
| RH09 |
-0.939 ± 0.024 |
-0.209 ± 0.069 |
-0.274 ± 0.267 |
-15.89 ± 4.01 |
192.53 ± 4.20 |
| RH10 |
-0.948 ± 0.022 |
-0.193 ± 0.070 |
-0.251 ± 0.246 |
-14.56 ± 3.99 |
191.53 ± 4.20 |
| Average |
-0.954 |
-0.180 |
0.046 |
2.774 |
190.592 |
| Median |
-0.965 |
-0.193 |
0.091 |
5.208 |
192.535 |
| Deviation |
0.039 |
0.073 |
0.239 |
14.137 |
4.194 |
Key shock
parameters (About, Top)
| Method |
ThetaBn |
Shock Speed |
Compression |
| MC |
51.2 ± 2.0 |
373.6 ± 3.9 |
2.00 ± 0.10 |
| VC |
53.4 ± 3.2 |
425.2 ± 4.2 |
2.00 ± 0.10 |
| MX1 |
58.8 ± 3.2 |
418.1 ± 4.2 |
2.00 ± 0.10 |
| MX2 |
58.6 ± 3.1 |
418.0 ± 4.2 |
2.00 ± 0.10 |
| MX3 |
58.2 ± 3.1 |
417.7 ± 4.1 |
2.00 ± 0.10 |
| RH08 |
49.3 ± 3.3 |
430.3 ± 4.3 |
2.00 ± 0.10 |
| RH09 |
61.1 ± 3.8 |
407.1 ± 4.8 |
2.00 ± 0.10 |
| RH10 |
59.8 ± 3.8 |
411.2 ± 4.8 |
2.00 ± 0.10 |
| Average |
56.3 |
412.6 |
2.00 |
| Median |
58.6 |
418.0 |
2.00 |
| Deviation |
4.4 |
17.4 |
0.00 |
Upstream wave speeds
and
mach numbers (About, Top)
|
Method
|
dV
|
Slow
|
Intermediate
|
Fast
|
Slow
Mach
|
Fast
Mach
|
| MC |
51.3 ± 1.3 |
13.0 ± 0.4 |
16.4 ± 0.7 |
37.2 ± 1.2 |
3.96 ± 0.11 |
1.38 ± 0.04 |
| VC |
56.7 ± 1.4 |
12.3 ± 0.4 |
15.6 ± 0.6 |
37.4 ± 1.2 |
4.63 ± 0.15 |
1.52 ± 0.05 |
| MX1 |
56.4 ± 1.4 |
10.5 ± 0.3 |
13.6 ± 0.6 |
38.0 ± 1.2 |
5.38 ± 0.17 |
1.49 ± 0.05 |
| MX2 |
56.4 ± 1.4 |
10.6 ± 0.3 |
13.6 ± 0.6 |
38.0 ± 1.2 |
5.34 ± 0.17 |
1.49 ± 0.05 |
| MX3 |
56.4 ± 1.4 |
10.7 ± 0.4 |
13.8 ± 0.6 |
37.9 ± 1.2 |
5.27 ± 0.16 |
1.49 ± 0.05 |
| RH8 |
56.6 ± 1.5 |
13.6 ± 0.4 |
17.1 ± 0.7 |
37.0 ± 1.2 |
4.17 ± 0.14 |
1.53 ± 0.06 |
| RH9 |
53.2 ± 1.4 |
9.8 ± 0.3 |
12.7 ± 0.5 |
38.2 ± 1.3 |
5.46 ± 0.20 |
1.40 ± 0.05 |
| RH10 |
53.9 ± 1.4 |
10.2 ± 0.3 |
13.2 ± 0.5 |
38.1 ± 1.2 |
5.29 ± 0.19 |
1.42 ± 0.05 |
| Average |
55.1 |
11.3 |
14.5 |
37.7 |
4.9 |
1.5 |
| Median |
56.4 |
10.7 |
13.8 |
38.0 |
5.3 |
1.5 |
| Deviation |
2.0 |
1.4 |
1.6 |
0.4 |
0.6 |
0.1 |
Downstream wave speeds
and
mach numbers (About, Top)
|
Method
|
dV
|
Slow
|
Intermediate
|
Fast
|
Slow
Mach
|
Fast
Mach
|
| MC |
26.0 ± 0.9 |
13.7 ± 0.3 |
15.8 ± 0.5 |
42.3 ± 0.7 |
1.91 ± 0.10 |
0.61 ± 0.03 |
| VC |
28.2 ± 1.6 |
12.9 ± 0.3 |
15.0 ± 0.5 |
42.6 ± 0.7 |
2.19 ± 0.16 |
0.66 ± 0.05 |
| MX1 |
28.0 ± 1.6 |
11.1 ± 0.2 |
13.0 ± 0.4 |
43.1 ± 0.7 |
2.53 ± 0.19 |
0.65 ± 0.04 |
| MX2 |
28.0 ± 1.6 |
11.2 ± 0.2 |
13.1 ± 0.4 |
43.1 ± 0.7 |
2.51 ± 0.18 |
0.65 ± 0.04 |
| MX3 |
28.0 ± 1.6 |
11.3 ± 0.2 |
13.3 ± 0.4 |
43.0 ± 0.7 |
2.48 ± 0.18 |
0.65 ± 0.04 |
| RH8 |
28.3 ± 1.7 |
14.3 ± 0.3 |
16.4 ± 0.5 |
42.1 ± 0.7 |
1.98 ± 0.15 |
0.67 ± 0.05 |
| RH9 |
26.3 ± 2.2 |
10.3 ± 0.2 |
12.2 ± 0.4 |
43.3 ± 0.7 |
2.55 ± 0.25 |
0.61 ± 0.06 |
| RH10 |
26.7 ± 2.1 |
10.8 ± 0.2 |
12.7 ± 0.4 |
43.2 ± 0.7 |
2.49 ± 0.24 |
0.62 ± 0.06 |
| Average |
27.4 |
11.9 |
13.9 |
42.8 |
2.3 |
0.6 |
| Median |
28.0 |
11.3 |
13.3 |
43.1 |
2.5 |
0.7 |
| Deviation |
0.9 |
1.5 |
1.6 |
0.4 |
0.3 |
0.0 |
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)
| 
