SV.acceleration_length
The wind acceleration height scale (\(R_v\)) for a disk wind described by the Shlosman Vitelo model.
\[v_l = v_o + (v_{\infty}(r_o)-v_o) \left[\frac {(l/R_v)^{\alpha}}{(l/R_v)^{\alpha}+1}\right]\]
Equation (2) Shlosman & Vitello 1993, ApJ 409, 372.