sisimple: sisimple: Calculates the solar index

In ilyamaclean/climvars: Functions for calculating biologically meaningful climate variables

Description

sisimple calculates the proportion of direct beam radiation incident on an inclined surface at a specified time and location.

Usage

sisimple(localtime, lat, long, julian, merid = 0, dst = 0)

Arguments

lat	latitude of the location for which the solar index is required (decimal degrees, -ve south of the equator).
long	longitude of the location for which the solar index is required (decimal degrees, -ve west of Greenwich meridian).
julian	Julian day expressed as an integer as returned by julday().
merid	an optional numeric value representing the longitude (decimal degrees) of the local time zone meridian (0 for GMT). Default is 0.
dst	an optional numeric value representing the time difference from the timezone meridian (hours, e.g. +1 for BST if merid = 0).
locatime	local time (decimal hour, 24 hour clock).

Value

a numeric value of the proportion of direct beam radiation on a horizontal surface at the specified latitude and longitude.

See Also

the microclima function julday can be used to derive julian.

Examples

jd <- julday (2010, 6, 21)
si <- sisimple(11, 50, -5, jd, merid=0, dst=0)

ilyamaclean/climvars documentation built on June 19, 2019, 2:22 p.m.