Global irradiance on Mars inclined surface

Calculates the total solar irradiance (direct beam + diffuse + albedo-reflected) incident on an inclined surface on Mars. Implements Equation 3 from Appelbaum, Flood & Norambuena (1994).

Usage

G_i(
  Ls,
  phi,
  longitude,
  Ts,
  z = Z(Ls = Ls, phi = phi, Ts = Ts),
  tau,
  al = albedo(latitude = phi, longitude = longitude, tau = tau),
  beta,
  gamma_c
)

Arguments

Ls: Areocentric longitude [deg]
phi: Planetary latitude [deg]
longitude: Planetary longitude [deg]
Ts: Solar time [h]
z: Sun zenith angle [deg]. If not provided, calculated from Ls, phi, and Ts
tau: Atmospheric optical depth (dimensionless)
al: Surface albedo (dimensionless, 0-1). If not provided, calculated from latitude, longitude, and tau
beta: Surface tilt/slope angle from horizontal [deg]
gamma_c: Surface azimuth angle [deg]. Zero facing equator, east negative, west positive (-180 to +180)

Value

Global irradiance on inclined surface [W/m²]