Paramètres météorologiques

Group	Abbreviation/Symbol	Description
Parameter	Bh	Direct radiation on horizontal surface
	Bk	Direct radiation on inclined surface
	Bn	Direct normal radiation (beam)
	DD	Wind direction
	Dh	Diffuse radiation (horizontal)
	Dh hor	Diffuse radiation (horizontal) with raised horizon
	Dh min	Diffuse radiation on clear days
	Dk	Diffuse radiation on inclined surface
	eh	Emissivity horizontal
	ev	Emissivity vertical
	FF	Wind speed (10 m above ground)
	FFE	Wind speed in E direction
	FFN	Wind speed in N direction
	FFaE, N, W, S	Wind fraction E, N, W, S (in %)
	<G>	Average radiation intensity
	Gh	Global radiation (horizontal)
	Gh hor	global radiation (horizontal) with raised horizon
	Gh max (Gc)	Maximum global radiation (on clear days) (horizontal)
	Gk	Global radiation on inclined surface
	GvE, N, W, S	Global radiation on vertical surface in E, N, W, and S directions
	H	Radiation time integral (radiation energy)
	HDD12/20	Heating degree days (with critical temperatures 12°C outside, 20°C in- side)
	Lin	Longwave horizontal radiation impinging (longwave incoming)
	Lup	Longwave horizontal radiation emitted (longwave outgoing)
	Lv	Longwave radiation on vertical surface
	LG	Global illuminance
	LD	Diffuse illuminance
	mx	Mixing ratio
	N	Total cloud cover
	p	Atmospheric pressure
	PAR	Photosynthetically active radiation
	PV	Photovoltaic (installation/production)
	r	Albedo, reflection coefficient
	R	Radiation balance
	Rb	Ratio of direct radiation integral on inclined and horizontal surfaces
	RD	Days with precipitation ≥ 1.0 mm
	R-Faktor	Ratio of global radiation integral on inclined and horizontal surfaces
	RH	Relative humidity
	RR	Precipitation
	Ta	Air temperature
	Td	Dew point temperature
	Tp	Wet-bulb temperature (psychrometer temperature)
	Ts	Surface temperature
	PrecW	Water content of Atmosphere (precipitable water)
Earth	j	Latitude
	j'	Latitude of equivalent horizontal area
	l	Longitude
Surface	b	Surface inclination
	g	Surface azimuth (orientation of surface)
	Q	Incident angle of radiation on inclined surface
	rD	Isotropic diffuse view factor
	rR	Isotropic reflex view factor
Sun	ma	Optical air mass
	d	Declination
	gs	Solar azimuth
	hs	Solar altitude
	I0	Solar constant
	G0	Radiation at the upper edge of the atmosphere (Solar constant adjusted to distance earth-sun)
	Gex	Extraterrestrial solar radiation (horizontal)
	KT	Clearness index (month)
	Kt	Clearness index (day)
	kt	Clearness index (hour)
	So	Astronomical day (sunshine duration)
	Sd	Effective sunshine duration
	ws	Hourly (solar) angle
	wss	Hourly angles at sunrise and sunset
Time	dm	Day of month (1..28/29/30/31)
	dy	Day of year (1..365/366)
	ET	Time equation
	GMT	Greenwich mean time (=UTC)
	h	Hour of day
	hy	Hour of year
	IZRM	Internal reference time in min
	m	Month
	CET (MEZ)	Central European Time
	ST	True solar time
	t	Local time (time of day)
	ts	Time difference between local time and zonal time
	tz	Time difference between zonal time and universal time
	UTC	Universal time coordinated

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