fCalcSunPosition: fCalcSunPosition

In REddyProc: Data processing and plotting utilities of (half-)hourly eddy-covariance measurements

Description

Calculate the position of the sun

Usage

fCalcSunPosition(DoY.V.n, Hour.V.n, Lat_deg.n, Long_deg.n, 
    TimeZone_h.n, useSolartime.b = TRUE)

Arguments

DoY.V.n	Data vector with day of year (DoY)
Hour.V.n	Data vector with time as decimal hour
Lat_deg.n	Latitude in (decimal) degrees
Long_deg.n	Longitude in (decimal) degrees
TimeZone_h.n	Time zone (in hours)
useSolartime.b	by default corrects hour (given in local winter time) for latitude to solar time << where noon is exactly at 12:00. Set this to FALSE to compare to code that uses local winter time

Details

This code assumes that Hour is given in local winter time zone, and corrects it by longitude to solar time (where noon is exactly at 12:00). Note: This is different form reference PVWave-code, that does not account for solar time and uses winter time zone. Set argument useSolartime.b to FALSE to use the local winter time instead.

Value

Data list with the following items:

SolTime	Solar time (SolTime, hours)
SolDecl	Solar declination (SolDecl, rad)
SolElev	Solar elevation with 0 at horizon (SolElev, rad)
SolAzim	Solar azimuth with 0 at North (SolAzim, rad)

Author(s)

AMM (Department for Biogeochemical Integration at MPI-BGC, Jena, Germany)

REddyProc documentation built on May 2, 2019, 5:19 p.m.