3.6 Type IV radio bursts

Some of these impulsive high-frequency microwave bursts are accompanied by long-lived radio enhancements at lower frequencies. Such type IV radio bursts cover a continuous spectrum with frequencies below 200 MHz, i.e., in the meter wavelength range. Sometimes their sources are seen to move away from the Sun. These moving type IV bursts were thought to be caused by electrons trapped in a closed magnetic cloud ejected from the flare site, but this interpretation is still under debate. For more information see, e.g., Švestka (1981) or Kahler (1992Jump To The Next Citation Point).
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