Calculates the direct beam solar irradiance incident on a horizontal surface on Mars.
Accounts for the angle of incidence on the horizontal plane. Implements Equation 18
from Appelbaum & Flood (1990).
Usage
G_bh(Ls, phi, Ts, z = Z(Ls = Ls, phi = phi, Ts = Ts), tau)
Arguments
- Ls
Areocentric longitude [deg]
- phi
Planetary latitude [deg]
- Ts
Solar time [h]
- z
Sun zenith angle [deg]. If not provided, calculated from Ls, phi, and Ts
- tau
Atmospheric optical depth (dimensionless)
Value
Direct beam irradiance on horizontal surface [W/m²]