The northern lights, lightning, and the advertising lights on a busy city street — are all evidence that plasmas are luminous, i.e., they radiate. In addition to radiating visible light, plasmas can radiate invisible ultraviolet rays. Hot plasmas can also radiate in the x-ray region of the spectrum. All of these emissions are similar, differing only in frequency (or wavelength). However, there are a number of different radiation processes: discrete, recombination, and bremsstrahlung. Each of these forms of radiation can occur in the various spectral regions.
KeywordsNeutral Atom Magnetic Field Line Plasma Layer Radiative Diffusion Inverse Process
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