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Diffuse irradiance on Mars horizontal surface

Source: R/G_dh.R
G_dh.Rd

Calculates the diffuse solar irradiance (scattered by atmospheric dust) incident on a horizontal surface on Mars. Computed as the difference between global and direct beam irradiance. Implements Equation 16 from Appelbaum & Flood (1990).

Usage

G_dh(
  Ls,
  phi,
  longitude,
  Ts = NULL,
  z = Z(Ls = Ls, phi = phi, Ts = Ts),
  tau,
  al = albedo(latitude = phi, longitude = longitude, tau = tau)
)

Arguments

Ls

Areocentric longitude [deg]

phi

Planetary latitude [deg]

longitude

Planetary longitude [deg]

Ts

Solar time [h]. Can be NULL for daily calculations

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

Value

Diffuse irradiance on horizontal surface [W/m²]