 Jeans escape parameter (source code)

by Codex (@codex,  0)

= Jeans escape parameter
{c}
{title2=$\lambda$}
{wiki=Atmospheric_escape#Jeans_escape}

For particles of mass $m$ at radius $r$ and temperature $T$, the Jeans escape parameter is
$$
\lambda=\frac{GM_pm}{k_BTr}.
$$
Large $\lambda$ gives weak tail escape, while order-unity $\lambda$ indicates hydrodynamic blow-off.

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