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TEMPERATURE BRILLANCE [1 record]
Record 1 - internal organization data 2007-02-05
Record 1, English
Record 1, Subject field(s)
- Space Physics
- Astrophysics and Cosmography
- Atmospheric Physics
Record 1, Main entry term, English
- radiance temperature
1, record 1, English, radiance%20temperature
correct, officially approved
Record 1, Abbreviations, English
Record 1, Synonyms, English
- brightness temperature 2, record 1, English, brightness%20temperature
correct, see observation
- equivalent blackbody temperature 3, record 1, English, equivalent%20blackbody%20temperature
correct
- equivalent black body temperature 4, record 1, English, equivalent%20black%20body%20temperature
correct
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
Apparent temperature of radiation from a distant emitting region, i.e. the temperature that a blackbody would have in order to radiate the same observed flux density per unit solid angle. 5, record 1, English, - radiance%20temperature
Record number: 1, Textual support number: 1 CONT
Brightness temperatures are both a measure of the physical temperature within the snow and a gauge of emissivity, or the ability of water or ice/snow to emit radiation at the microwave frequencies (frequencies in the centimeter wavelength range). Dry snow emits much less radiation than wet snow, which behaves almost like a perfect emitter (blackbody), giving off a wide range of frequencies of radiation. Therefore, dry snow and ice have lower brightness temperatures than wet snow surfaces. 6, record 1, English, - radiance%20temperature
Record number: 1, Textual support number: 2 CONT
Depending on the nature of the source of radiation and any subsequent absorption, the brightness temperature may be independent of, or highly dependent on, the wavelength of the radiation. 7, record 1, English, - radiance%20temperature
Record number: 1, Textual support number: 3 CONT
Ultimately, one is interested in the temperature that corresponds to a particular Planck function value ... This temperature is determined by inverting the Planck function, ... The temperature derived is called brightness temperature because of its historical connection with radio astronomy; however, the terms radiance temperature or equivalent black body temperature are also frequently used. 8, record 1, English, - radiance%20temperature
Record number: 1, Textual support number: 1 OBS
The word "brightness" is often used by physicists to mean what illumination engineers and laboratory photometrists call "luminance". However, astronomers usually use "brightness" for what is more usually called "radiance", or even "spectral radiance" (whence the term "brightness temperature", used in astrophysics, radio astronomy, planetary science and remote sensing, for the temperature of a black body having the same spectral radiance as an astrophysical object at some wavelength). When luminance is intended, astronomers usually say "surface brightness". 9, record 1, English, - radiance%20temperature
Record number: 1, Textual support number: 2 OBS
Brightness temperature in radio astronomy is equivalent to specific intensity in optical astronomy. 10, record 1, English, - radiance%20temperature
Record number: 1, Textual support number: 3 OBS
luminance temperature: luminance [is] the photometric equivalent of radiance. Luminance is obtained by integrating spectral radiance weighted by luminous efficiency over the visible spectrum. 7, record 1, English, - radiance%20temperature
Record number: 1, Textual support number: 4 OBS
radiance temperature: term officially approved by the RADARSAT-2 Terminology Approval Group (RTAG). 11, record 1, English, - radiance%20temperature
Record 1, French
Record 1, Domaine(s)
- Physique spatiale
- Astrophysique et cosmographie
- Physique de l'atmosphère
Record 1, Main entry term, French
- température de luminance
1, record 1, French, temp%C3%A9rature%20de%20luminance
correct, feminine noun, officially approved
Record 1, Abbreviations, French
Record 1, Synonyms, French
- température de brillance 2, record 1, French, temp%C3%A9rature%20de%20brillance
correct, feminine noun
- température équivalente de corps noir 5, record 1, French, temp%C3%A9rature%20%C3%A9quivalente%20de%20corps%20noir
feminine noun
- température équivalente corps noir 6, record 1, French, temp%C3%A9rature%20%C3%A9quivalente%20corps%20noir
feminine noun
- température radiative apparente 3, record 1, French, temp%C3%A9rature%20radiative%20apparente
feminine noun
- température apparente 6, record 1, French, temp%C3%A9rature%20apparente
feminine noun
Record 1, Textual support, French
Record number: 1, Textual support number: 1 DEF
[...] température à laquelle il faudrait porter un corps noir pour qu'il présente un rayonnement dont l'énergie est identique à celle du corps analysé dans la même bande de fréquence. 7, record 1, French, - temp%C3%A9rature%20de%20luminance
Record number: 1, Textual support number: 1 CONT
[...] les données acquises de manière passive dans le domaine micro-onde [hyperfréquences] sont présentées en température de brillance Tb [...] La température de brillance est la température que devrait avoir un corps noir pour avoir la même luminance que l'objet observé qui a une température T [...] 8, record 1, French, - temp%C3%A9rature%20de%20luminance
Record number: 1, Textual support number: 2 CONT
Dans le domaine de l'infra-rouge thermique utilisé en télédétection (8 - 14 mm), les nuages sont pratiquement assimilables à des corps noirs et ont une émissivité de 0.98. La détermination de leur luminance permet alors d'accéder à leur température, elle-même très liée à leur altitude. [...] La luminance obtenue dans une bande spectrale sur une cible précise est transformée en température de brillance à l'aide de tables dérivées de l'équation de Planck. 9, record 1, French, - temp%C3%A9rature%20de%20luminance
Record number: 1, Textual support number: 3 CONT
[...] l'océan rayonne de l'énergie en quantité identique à celle qu'il absorbe. La puissance qu'il émet par unité d'angle solide et de surface s'appelle la brillance (B) et se mesure en watts par stéradian et par mètre carré [En fait,] ce que l'on appelle couramment «brillance» en télédétection hyperfréquence correspond à la définition rigoureuse de la «luminance» (ou «radiance» en anglais). Rigoureusement, la brillance est la puissance reçue, par unité d'angle solide et de surface du capteur. On définit couramment la puissance rayonnée par la mer en terme de température de brillance (Tb), qui représente la température du corps noir qui aurait, à la fréquence [...] la même brillance que la mer. Un corps noir est un objet qui absorbe tout le rayonnement incident à sa surface, et par conséquent dont la réflectivité est nulle. 4, record 1, French, - temp%C3%A9rature%20de%20luminance
Record number: 1, Textual support number: 1 OBS
température de luminance : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR). 10, record 1, French, - temp%C3%A9rature%20de%20luminance
Record 1, Key term(s)
- température de corps noir équivalente
Record 1, Spanish
Record 1, Campo(s) temático(s)
- Física espacial
- Astrofísica y cosmografía
- Física de la atmósfera
Record 1, Main entry term, Spanish
- temperatura de luminancia
1, record 1, Spanish, temperatura%20de%20luminancia
feminine noun
Record 1, Abbreviations, Spanish
Record 1, Synonyms, Spanish
Record 1, Textual support, Spanish
Record number: 1, Textual support number: 1 DEF
Temperatura de un cuerpo negro que irradia la misma cantidad de energía por unidad de superficie, en las longitudes de onda consideradas, que el cuerpo observado. 1, record 1, Spanish, - temperatura%20de%20luminancia
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