Brightness temperature
Brightness Temperature
Brightness temperature (pronunciation: /ˈbrītnəs ˈtemp(ə)rəCHər/) is a term used in radio astronomy and remote sensing to describe the temperature a black body in thermal equilibrium would have to be to duplicate the observed intensity of a source at a particular frequency.
Etymology
The term "brightness temperature" is derived from the concept of brightness in optics, which describes the perceived intensity of light, and temperature, which is a measure of the average kinetic energy of particles in a substance.
Definition
Brightness temperature is defined as the temperature a black body in thermal equilibrium would need to have in order to reproduce the observed intensity of a source at a specific frequency. It is a measure of the amount of radiation emitted by an object, and is used in various fields such as radio astronomy and remote sensing to study celestial bodies and the Earth's atmosphere.
Related Terms
- Black Body: An idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence.
- Thermal Equilibrium: A state in which all parts of a system are at the same temperature.
- Radio Astronomy: A subfield of astronomy that studies celestial objects at radio frequencies.
- Remote Sensing: The acquisition of information about an object or phenomenon without making physical contact with the object.
See Also
External links
- Medical encyclopedia article on Brightness temperature
- Wikipedia's article - Brightness temperature
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