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. 2019 May 31;9:8157. doi: 10.1038/s41598-019-44596-3

Table 1.

Scaling between the laboratory system and a typical intermediate polar.

Parameter Lab Astro
Plasma βram 1 1
Magnetic Reynolds number, Rm 10 ≫ 1
Fluid Reynolds number, R 105 106
Mach number, M 2 >10
Cooling time, tcool 3–4 ns ~1 s
Cooling parameter, χ 0.5 ≪1
Shock standoff distance, hs, 0.8 ± 0.1 mm ~1000 km

The cooling parameter is defined as the ratio of the cooling time to the characteristic hydrodynamical timescale χ = tcool/thyd and is a measure of the importance of radiative effects. Values for the astrophysical system are taken from13,27.