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Table 4
Parameter η(r), defined by η(r) = 2αni(r)r∕Un, and its asymptotic values function of Q∕Q0, where Q0 is defined by Eq. (20) for the different analytical models we compared.
| Analytical models | Cravens (1987) | Galand et al. (2016) | Gombosi (2015) | This work (Eq. (27)) |
|---|---|---|---|---|
| η(r) |  |
 |
 |
 |
 or rc = 0 |
 |
 |
||
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