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Table 1
Shock parameters.
| Parameter | Symbol | Value(s) | Unit |
|---|---|---|---|
| Shock velocity | Vs | 5–80 | km s−1 |
| Preshock proton density (a) | nH | 102–106 | cm−3 |
| Magnetic parameter (b) | b | 0.1 or 1 | |
| Cosmic-ray ionisation rate | ζ | 10−16 | s−1 |
| External radiation field (c) | G0 | 0 or 103 | |
| Viscous length | l | 1013∕nH | cm |
| Number of H2 levels | Nlev | 150 |
Notes. (a)Defined as nH = n(H) + 2n(H2). (b)Sets the initial transverse magnetic field 
. (c)The scaling factor G0 is applied to the standard UV radiation field of Mathis et al. (1983).
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