nonthermal emission

(non-th'er -măl) (nonthermal radiation) Electromagnetic radiation, such as synchrotron emission, that is produced, like thermal emission, by the acceleration of electrons or other charged particles but is nonthermal in origin, i.e. its spectrum is not that of a perfect black-body radiator.

Collins Dictionary of Astronomy © Market House Books Ltd, 2006

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References in periodicals archive

In fact, the signal received from the Sun is more than 100 [degrees] and somewhat variable, owing to nonthermal emission associated with sunspots or active regions.

Radio astronomy with a satellite dish

Unlike nonthermal emissions, the brightness temperature of thermal emissions cannot exceed the plasma temperature.

Evaluating the Solar Slowly Varying Component at C-Band Using Dual- and Single-Polarization Weather Radars in Europe

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