Shortwave Radiation at Top of Atmosphere — rad_sw

Calculates the shortwave radiation at the top of the atmosphere without the influence of the atmosphere.

Usage

rad_sw_toa(...)

# Default S3 method
rad_sw_toa(datetime, lon, lat, ..., sol_const = 1361)

# S3 method for class 'weather_station'
rad_sw_toa(weather_station, ...)

Arguments

...: Named station fields, site parameters or model assumptions.
datetime: POSIXlt or POSIXct date-time vector.
lon: Longitude in degrees.
lat: Latitude in degrees.
sol_const: Solar radiation constant in W/m², default is 1361.
weather_station: A weather_station object.

Value

Shortwave radiation at top of atmosphere in W/m².

Details

The shortwave radiation at the top of the atmosphere ($SW_{toa}$) is calculated using the formula: $$SW_{toa} = S \cdot E \cdot \sin(E)$$ where: $S$ is the solar constant (default 1361 W/m²), $E$ is the eccentricity correction factor, $E$ is the solar elevation angle.

References

Bendix 2004, p. 244.

Examples

# Calculate shortwave radiation at top of atmosphere
example_time <- as.POSIXlt("2023-08-06 12:00:00", tz = "UTC")
rad_sw_toa(datetime = example_time, lon = 10, lat = 50)
#> [1] 1107.353