tau0R

skysim.transmission.tau0R(lam, p=744.0, H=2.64)

Calculate zenith optical depth due to Rayleigh scattering.

Use equation (3) of Noll 2012:

\[\tau_0^R(\lambda) = \frac{p}{1013.25\,\text{hPa}} \left( 0.00864 + 6.5\times 10^{-6} \frac{H}{1\,\text{km}}\right) \lambda^{-(0.3916 + 0.074 \lambda + 0.050 / \lambda)}\]

Automatically broadcasts over any input arrays.

Parameters

lamfloat or array

Wavelength in nanometers.

pfloat or array

Pressure at the observation elevation in hPa.

Hfloat or array

Elevation of the observation in km.

Returns

float or array

Optical depth(s) calculated for the input parameters.