All of the pertinent initial set up information and results associated
with the execution of SNP are found on the General Information
Page. This can be brought up at any stage in running the program
by clicking on the Info Page button. This produces a separate
window as below.
At the very top of the page is the print option which allows the information on this page to be dumped to a file. Clicking on the PRINT button dumps the information to the file name given at the right. This is defaulted to SNP_DMP but can be changed.
Below this is the input information used to derive the final results. This consists of the file from which the data was obtained, the format of the file, how the low and high entropy data was to be merged and the gamma value used the heat flux equations. The latter is used only if the total temperature is present in the input data. The next 5 lines show the times selected for interval on the side 1 (to the left of the shock time), the shock time and the times selected for interval on the side 2 (to the right of the shock time).
The results of any given run are displayed below the times.
These begin with the shock definition followed by a list of the derived
quantites for each of the 4 solution methods. Each entry is split
into the derived value (black) and its 1 sigma deviation (blue). The
values produced are:
| RESULT DEFINITIONS | ||
|---|---|---|
| VALUE | UNITS | DEFINITION |
| TBn | degrees | The angle between the shock normal and the low entropy (upstream) side magnetic field |
| Nx | unitless | X component of shock normal |
| Ny | unitless | Y component of shock normal |
| Nz | unitless | Z component of shock normal |
| Phi | degrees | Spherical azimuthal angle of the normal vector |
| Theta | degrees | Spherical elevation angle of the normal vector |
| Vs | km/sec | The shock speed |
| TBn | degrees | The angle between the shock normal and the low entropy (upstream) side magnetic field |
| Ma | km/sec | The Alfven mach number |
| N1 | /cc | The derived asymtotic side 1 density |
| Vx1 | km/sec | The derived asymtotic side 1 X component of the plasma velocity |
| Vy1 | km/sec | The derived asymtotic side 1 Y component of the plasma velocity |
| Vz1 | km/sec | The derived asymtotic side 1 Z component of the plasma velocity |
| Bx1 | km/sec | The derived asymtotic side 1 X component of the magnetic field |
| By1 | km/sec | The derived asymtotic side 1 Y component of the magnetic field |
| Bz1 | km/sec | The derived asymtotic side 1 Z component of the magnetic field |
| N2 | /cc | The derived asymtotic side 2 density |
| Vx2 | km/sec | The derived asymtotic side 2 X component of the plasma velocity |
| Vy2 | km/sec | The derived asymtotic side 2 Y component of the plasma velocity |
| Vz2 | km/sec | The derived asymtotic side 2 Z component of the plasma velocity |
| Bx2 | km/sec | The derived asymtotic side 2 X component of the magnetic field |
| By2 | km/sec | The derived asymtotic side 2 Y component of the magnetic field |
| Bz2 | km/sec | The derived asymtotic side 2 Z component of the magnetic field |
| dP | eV/cc | The pressure difference computed as the pressure on the high entropy (downstream) side of the shock less the pressure on the low entropy (upstream) side of the shock. |
The computations of the standard deviations are computed using several methods. Those used generally depend on the quantity and the solution scheme.
The shock normal components in the Magnetic Coplanarity, Abraham-Shrauner, and Velocity Coplanarity methods are computed directly from the input data. There is one value computed for each combined upstream and downstream set of data values. The final shock components are the average of these values and the standard deviations are the computed from the difference between the derived and average values. There is no standard deviation given for the Phi and Theta values which are computed directly from the normal components.
Under the Vinas-Scudder method the standard deviations for the Phi and Theta components are computed directly from the Covarience matrix which is produced within the fitting program. These deviations are then used to derive the standard deviation for the shock normal components which are produced directly from the angles. This is done by producing shock normals at all combinations of the angles and then deriving the standard deviation from the difference between these and the central values.
Under all methods the values for the shock speed are computed as the slope of the line NV vs V. The standard deviation is the square root of the variance for the coefficient returned from the least squares fit routine. ThetaBN, and the Alven Mach number are computed point by point. The standard deviations in each case are produced from the differences between the average and actual values.
The standard deviations given with the asymtotic parameters are formed by the difference between the measured values within the time range specified for side 1 or side 2 and the derived asymtotic value.