Astronomy / Earth
When an atmosphere escapes
Heat the exobase and switch molecular mass. Compare the escape speed with the thermal velocity distribution and the Jeans escape parameter.
The model and its limits
Collisionless Maxwellian gas at an Earth-sized exobase. The visible particles sample ballistic directions; no hydrodynamic blow-off, chemistry or atmospheric lifetime is predicted.
Equations used in the module
Equations v_th = √(2kT/m); λ = v_esc²/v_th²; Φ_J = n v_th (1+λ)e^(-λ)/(2√π)
