| aérosols (FR)
Aerosol (DE)
aerosol (ES)
aérosols (IT)
aerosoler (NO)
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| aerosols
Aerosols are particles suspended in the atmosphere. They range in size from about 10-3 µm to about 20 µm. They are produced by natural processes or man's activities. They include volcanic dust, sea spray and its particulate products, wind generated dust, smoke from natural forest fires, particles emitted during combustion…
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| albédo (FR)
Reflektivität (DE)
albedo (ES)
albèdine (IT)
albedo (NO)
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| albedo
Unit: 1
Ratio of the radiant flux reflected by a surface to the incident flux.
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| albédo (FR)
Reflektivität (DE)
albedo (ES)
albèdine (IT)
albedo (NO)
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| albedo (relative to a pixel of a satellite image)
Unit: 1
At a given time, the albedo of an area of the earth seen by a pixel of a satellite image. The pixel value C (an integer from 0 to 255) depends on the energy radiated by the sun at that time. Therefore, the albedo  is computed by normalizing the pixel value with respect to the sun altitude at that time:
Co is called the registration offset. It is the sum of the satellite instrument offset (a value of 5) and the contribution of the backscattering of solar radiation in the atmosphere. Eesno is the extraterrestrial normal irradiance and  is the solar elevation.
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| hauteur (FR)
Stationshöhe (DE)
altitud (ES)
altezza (IT)
stasjonshøyde (NO)
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| altitude
Unit: meter
Altitude of a site above sea level. In the Satel-Light database, this is the average altitude of an area of 5' longitude by 5' latitude (about 60 square km in central Europe).
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| hauteur angulaire (FR)
Höhenwinkel (DE)
altura angular (ES)
altezza angolare (IT)
elevasjonsvinkel (N0)
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| altitude angle
Unit: degree
Altitude angle above horizon of a point in the sky hemisphere. Also called elevation angle.
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| anisotrope (FR)
anisotrop (DE)
anisotrop (N0)
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| anisotropic
Having dependence on direction or angle.
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| azimut (FR)
Azimut (DE)
acimut (ES)
azimut (IT)
asimut (NO)
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| azimuth
Unit: degree
Angle between the projection of the normal of a surface onto the horizontal and true north. Measured clockwise. A surface facing east has an azimuth of 90 degrees. A surface facing south has an azimuth of 180 degrees. A surface facing west has an azimuth of 270 degrees.
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| rétro diffusion (FR)
Rückstreuung (DE)
tilbakespredning (N0)
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| backscattering
Act of the solar radiation being scattered in a backward direction (toward space) by the particles and the molecules of the atmosphere.
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| candela (FR)
Candela (DE)
candela (ES)
candela (IT)
candela (NL)
candela (NO)
Kandela (PL)
candela (SE)
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| candela
Unit: lm/sr
CIE. SI unit of luminous intensity. The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian (16th General Conference of Weights and Measures, 1979).
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| candela par mètre carré (FR)
Candela pro Quadratmeter (DE)
candela por metro cuadrado; nit (ES)
candela al metro quadrato (IT)
candela per vierkante meter (NL)
candela pr kvadratmeter (NO)
Kandela na metr kwadratowy (PL)
candela per kvadratmeter (SE)
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| candela per square meter
Unit: lm/(sr.m2)
CIE. SI unit of luminance. A non-metric unit is sometimes used: the footlambert = 3.426 cd/m2.
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| indice de clarté du ciel (FR)
Clearness Index (DE)
indice de claridad del cielo (ES)
indice di chiarore del cielo (IT)
clearness index (NO)
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| clearness index
Unit: 1
Ratio of the global horizontal irradiance to the extraterrestrial horizontal irradiance.
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| indice de ciel clair (FR)
Clear Sky Index (DE)
indice de cielo claro (ES)
indice di cielo chiaro (IT)
clear sky index (NO)
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| clear sky index
Unit: 1
Ratio of the global horizontal irradiance to the global horizontal irradiance under clear sky conditions.
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| heure légale (FR)
Zonenzeit (DE)
hora legal (ES)
ora legale (IT)
klokkeslett (NO)
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| clock time
Unit: hours from midnight
Time used in a country, or part of a country. Usually expressed relatively to the Greenwich Meridian Time (GMT) used in the United Kingdom: GMT+3 means three hours more than GMT.
In some countries, for energy saving purposes, one hour is added to clock time from the last Sunday of March, to the Saturday before the last Sunday of October. This is called daylight saving time or summer clock time, as opposed to winter clock time outside of that period.
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| nébulosité (FR)
Gesamtbewölkungsgrad (DE)
factor de nubusidad (ES)
nuvolosita (IT)
bewolkingsgraad (NL)
skydekkefraksjon (NO)
wspolczynnik zachmurzenia (PL)
molnmängd (SE)
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| fractional cloud cover
Unit: 1
CIE. Ratio of the sum of the solid angles subtended by clouds to the solid angle  steradians of the whole sky.
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| indice de nuage (FR)
Bewölkungsindex (DE)
indice de nubes (ES)
indice di annuvolamento (IT)
skydekkeindeks(NO)
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| cloud index
Unit: 1
For a pixel in the satellite image, the ratio of the difference between the albedo and the ground albedo  , to the difference between the cloud albedo  and the ground albedo.
The ground albedo and the cloud albedo are calculated based on monthly values of the albedo under cloudfree and totally cloudy conditions.
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| lumière du jour (FR)
Tageslicht (DE)
luz de dia (ES)
luce del giorno; luce diurna (IT)
daglicht (NL)
dagslys (NO)
oswietlenie sloneczne
calkowite (PL)
dagsljus (SE)
| | daylight
CIE. Visible part of global solar radiation.
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| facteur de lumière du jour (FR)
Tageslichtquotient (DE)
factor de luz de dia (ES)
fattore di luce diurna (IT)
daglichtfactor (NL)
dagslysfaktor (NO)
wspolczynnik oswietlenia
dziennego (PL)
dagsljusfaktor (SE)
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| daylight factor
Unit: 1 or %
CIE. Ratio of the illuminance at a point on a given plane due to the light received directly or indirectly from a sky of assumed or known luminance distribution, to the illuminance on a horizontal plane due to an unobstructed hemisphere of this sky. The contribution of direct sunlight to both illuminances is excluded. (Glazing, dirt effects, etc. are included, when calculating the lighting of interiors, the contribution of direct sunlight must be considered separately). Unless stated otherwise the sky luminance distribution is assumed to be that of the CIE standard overcast sky.
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| facteur de lumière
du jour directionnel (FR)
richtungsabhängiger
Tageslightquotient (DE)
factor direccional
de luz de dia (ES)
fattore di luce
diurna direzionale (IT)
retningsavhengig
dagslysfaktor (NO)
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| directional daylight factor
Unit: 1 or %
The daylight factor at a point P due to the light received from only a patch of the sky. The sky can be divided into zones of altitude and azimuth, and the directional daylight factor can be found for each zone. The total illuminance at a point  is then the sum of the products of the mean luminance of each sky zone  , the subtended area of the zone  and the corresponding directional daylight factor  :
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| fraction de diffus (FR)
Diffusanteil,
Diffusstrahlungsanteil (DE)
diffusfraksjon (NO)
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| diffuse fraction
Unit: 1
Ratio of the diffuse horizontal irradiance to the global horizontal irradiance.
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| éclairement lumineux
diffus horizontal (FR)
diffuse horizontale
Beleuchtungsstärke (DE)
iluminancia horizontal difusa (ES)
illuminamento
orizontale diffuso (IT)
diffus horisontal
belysningsstyrke (NO)
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| diffuse horizontal illuminance
Unit: lx
Illuminance produced by the visible part of the diffuse solar radiation on a horizontal surface on the earth.
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| éclairement énergétique
diffus horizontal (FR)
diffuse horizontale
Einstrahlung (DE)
irradiancia horizontal difusa (ES)
illuminamento energetico
orizontale diffuso (IT)
diffus horisontal irradians (NO)
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| diffuse horizontal irradiance
Unit: W/m2
Irradiance produced by the diffuse solar radiation on a horizontal surface on the earth.
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| facteur de réflexion diffus (FR)
Grad der gestreuten Reflexion (DE)
reflectancia difusa (ES)
fattore di reflessione diffusa (IT)
diffuse reflectiefactor (NL)
diffus reflektans (NO)
wspotezynnik odbicia rozproszonego (PL)
diffus reflektans (SE)
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| diffuse reflectance
Unit: 1
CIE. Ratio of the diffusely reflected part of the (whole) reflected flux, to the incident flux.
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| rayonnement diffus du ciel (FR)
diffuse Himmelsstrahlung (DE)
radiación del cielo (ES)
radiazione diffusa dal cielo (IT)
diffuse hemelstraling (NL)
diffus himmelstråling (NO)
promieniowanie niebosklonu;
promieniowanie sloneczne roz-proszone (PL)
himmelsstralning (SE)
| | diffuse solar (sky) radiation
CIE. That part of solar radiation that reaches the Earth as a result of being scattered by air molecules, aerosol particles, cloud particles or other particles.
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| facteur de transmission
diffuse (FR)
Grad der gestreuten
Transmission (DE)
transmitancia difusa (ES)
fattore di transmissione diffusa (IT)
diffuse doorlatings factor (NL)
diffus transmittans (NO)
wspólczynnik przepuszczania
rozproszonego (PL)
diffus transmittans (SE)
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| diffuse transmittance
Unit: 1
CIE. Ratio of the diffusely transmitted part of the (whole) transmitted flux, to the incident flux.
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| éclairement lumineux
direct horizontal (FR)
direkte horizontale Beleuchtungsstärke (DE)
iluminancia horizontal directa (ES)
illuminamento orizontale
diretto (IT)
direkte horisontal
belysningsstyrke (NO)
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| direct horizontal illuminance
Unit: lx
Illuminance produced by the visible part of the direct solar radiation on a horizontal surface on the earth.
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| éclairement lumineux
direct normal (FR)
direktnormale Beleuchtungsstärke (DE)
iluminancia normal directa (ES)
illuminamento normale
diretto (IT)
direkte vinkelrett
belysningsstyrke (NO)
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| direct normal illuminance
Unit: lx
Illuminance produced on the earth by the visible part of the direct solar radiation on a surface perpendicular to the sun's rays.
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| éclairement énergétique
direct horizontal (FR)
direkte horizontale Einstrahlung (DE)
irradiancia horizontal directa (ES)
illuminamento energetico
orizontale diretto (IT)
direkte horisontal irradians (NO)
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| direct horizontal irradiance
Unit: W/m2
Irradiance produced by the direct solar radiation on a horizontal surface on the earth.
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| éclairement énergétique
direct normal (FR)
direkt normale Einstrahlung (DE)
irradiancia normal directa (ES)
illuminamento energetico
normale diretto (IT)
direkte vinkelrett irradians (NO)
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| direct normal irradiance
Unit: W/m2
Irradiance produced on the earth by the direct solar radiation on a surface perpendicular to the sun's rays.
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| rayonnement solaire direct (FR)
direkte Solarstrahlung (DE)
radiación solar directa (ES)
radiazione solare diretta (IT)
directe zonnestraling (NL)
direkte solstråling (NO)
promieniowania stoneczne
bez-pósrednie; insolacja (PL)
direkt solstralning (SE)
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| direct solar radiation
CIE. That part of extraterrestrial solar radiation which as a collimated beam reaches the Earth's surface after selective attenuation by the atmosphere.
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