Table 1.
Typical and normalizing values.
| Quantity | Symbol | Normalizing value | Typical in active region | Typical in quiet sun |
|---|---|---|---|---|
| Magnetic field strength | B0 | 2 × 10−3 T | 1 × 10−2 T | 1 × 10−3 T |
| Electron number density | ne | 1 × 1015 m−3 | 5 × 1015 m−3 | 1 × 1015 m−3 |
| Length scale | L0 | 1 × 106 m | 3 × 106 m | 1 × 106 m |
| Alfvén speed | vA | 1.38 × 106 m s−1 | 3.09 × 106 m s−1 | 6.90 × 105 m s−1 |
| Alfvén travel time | tA | 0.724 s | 0.972 s | 1.45 s |
| Magnetic energy density | W0 | 3.18 J m−3 | 79.6 J m−3 | 0.796 J m−3 |
| Current density | j0 | 1.59 × 10−3 A | 2.65 × 10−3 A | 7.96 × 10−4 A |
Notes. For each physical quantity listed in the first column, denoted by the symbols shown in the second, the chosen normalizing value here is shown in the third column, alongside typical values to be seen in active regions (fourth column) and in the quiet Sun (fifth column) (as in, for example, Priest 2014).
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