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Table 1.
Comparison and scalability between the laboratory plasma stream impacting the obstacle target and the CTTS accretion stream impacting the surface of the star.
| Laboratory | CTTS | |
|---|---|---|
| Material | CF2 (Teflon) | H |
| Charge state Z | 3.94 | 1 |
| Mass number A | 17.32 | 1.28 |
| B-field [T] | 30 | 2 × 10−2 |
| Spatial scale [cm] | 0.07 | 5 × 109 |
| Electron density [cm−3] | 1.5 × 1018 | 5 × 1012 |
| Ion density [cm−3] | 3.8 × 1017 | 5 × 1012 |
| Density [g cm−3] | 1.1 × 10−5 | 1.1 × 10−11 |
| Te [eV] | 10 | 0.22 |
| Ti [eV] | 10 | 0.22 |
| Flow velocity [km s−1] | 750 | 500 |
| Sound velocity [km s−1] | 21.3 | 7.4 |
| Alfven velocity [km s−1] | 254.8 | 172.4 |
| Electron mean free path [cm] | 4.1 × 10−5 | 0.02 |
| Electron collision time [ns] | 3 × 10−4 | 1.1 |
| Ion mean free path [cm] | 3.7 × 10−6 | 0.03 |
| Ion collision time [ns] | 5 × 10−3 | 74.5 |
| Magnetic diffusion time [ns] | 0.8 × 103 | 4.8 × 1022 |
| Electron Larmor radius [cm] | 2.5 × 10−6 | 5.6 × 10−4 |
| Electron gyrofrequency [s−1] | 8.4 × 1012 | 5.6 × 109 |
| Ion Larmor radius [cm] | 1.1 × 10−4 | 0.027 |
| Ion gyrofrequency [s−1] | 1 × 109 | 2.4 × 106 |
| Electron magnetization | 16.3 | 38.2 |
| Ion magnetization | 0.03 | 1.1 |
| Mach number | 35.2 | 67.5 |
| Alfven Mach number | 2.9 | 2.9 |
| Reynolds number | 3.1 × 103 | 1.1 × 1012 |
| Magnetic Reynolds number | 0.86 × 103 | 4.8 × 1011 |
| Peclet number | 17 | 2.3 × 1010 |
| Euler number | 45.4 | 87.2 |
| β | 8.4 × 10−3 | 2.2 × 10−3 |
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