CfA Interplanetary Shock Database - Individual Event Detail
 

Database: Ace Shock Analysis
Event ID: 19982911900
Observation time: 10/18/1998 291.79223 1900 [UT]

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Asymptotic parameters
Shock front normals
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Wave speed and Mach numbers
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Simple methods
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Individual equations
Shock speed
Theta Bn
Mach numbers


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)
Survey of solar wind interval
Selected data (About, Top)
Key plasma parameters
Survey
Velocity
V

Magnetic Field
B


Simple Methods (About, Top)
Simple methods
Rankine Chi^2 Contour (About, Top)

Chisq


Shock Speed (About, Top)
Shock Speed

Theta Bn (About, Top)
Theta Bn

Mach Numbers (About, Top)

Upstream wave speeds
Upstream Mach numbers
Downsteam wave speeds
Downstream mach numbers
Page updated Mon Apr 13 08:55:21 2009
Michael L Stevens (mstevens@cfa.harvard.edu)

   
 

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