Definitions for "Transition region"
The region around or approximately one sixth of a wavelength between the near and far fields.
Area of the Sun's atmosphere with temperatures between those of the chromosphere and the corona, 20,000 - 1,000,000°C. more
The trasition region is the very narrow region of the solar atmosphere that separates the chromosphere and corona, where the temperature rises sharply from 20,000 to nearly a million Kelvin degrees.
The part of the spectrum between the passband and the stopband.
The frequency range between the passband and stopband.