chirkin_cos_theta_star

MCEq.geometry.geometry.chirkin_cos_theta_star(costheta)

\(\cos(\theta^*)\) parameterization.

This function returns the equivalent zenith angle for for very inclined showers. It is based on a CORSIKA study by D. Chirkin, hep-ph/0407078v1, 2004.

Parameters:

costheta (float) – \(\cos(\theta)\) in [rad]

Returns:

\(\cos(\theta*)\) in [rad]

Return type:

float