Acronymes and Useful Vocabulary

A problem of units ?
of terminology ?
Consult the Education service.

Satellite	SoDa	Solar radiation Data. website / Service.
	MSG	Meteosat Second Generation satellites. Images of origin of the data.
	IR	Infra Red
	WV	Water Vapor
	HC	HelioClim. Databases
Radiation	au	Astronomical Unit: averaged sun-earth distance ≈ 149 597 871 km.
	Esc	Solar Constant = 1367 W/m². Solar energy received by a surface normal to sun rays, located at the top of the atmosphere, and at a distance of 1 au.
	E0	Extraterrestrial Irradiance on the normal plane. Solar energy received by a surface normal to sun rays, located at the top of the atmosphere at a given date. It is a function of Esc and of the instantaneous sun-earth distance.
	GHI	Global Horizontal Irradiation
	DNI	Direct Normal Incidence or Direct Normal Irradiation
	ToA	Top of Atmosphere. Solar radiation received by a horizontal surface located at the top of the atmosphere.
	Kt	Clearness Index = GHI/E0
	Kc	Clearsky Index = GHI/GHIclearsky
	Kd	Kd = DHI/GHI
	TMY	Typical Mean Year: a one-year time series of hourly parameters (irradiation, temperature, wind speed...) which should be representative of the x years (x=10, 15, or 20 years...) of data available.
	P50	Percentil 50%: for example, in a population of 100 people from 1 to 100 years old, and if George is 50 years old, he will be the percentil 50%, i.e. the person dividing the population of ages in two identical groups of 50 people.
	P90	Percentil 90%: in the same example as above, if Jane is 10 years old, she will be the percentil 90 of this group since 90% of the people has more than 10 years old.
Time	UT	Universal Time
	TST	True Solar Time
	MST	Mean Solar Time
	- time step - frequency - summarization - period of observation - period of integration - duration of observation	All these terms mean the time step of the retrieved data: monthly, daily, hourly or 15 minute data.
Atmosphere	Tl	Linke Turbidity factor - parameter which gives an information on the nebulosity of the atmosphere
Tools	GIS	Geographical Information System
	PVGIS	PhotoVoltaique Geographical Information System
	IT	Information Technology
	FAI	Fournisseur Accès Internet
Organisations	OME	Opérateurs des Métiers de l'Environnement (Paris)
	JRC
	NOAA
	NCEP
	IEA	International Energy Agency
	GEO
	GEOSS

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