IT has recently been proposed that the very-low-frequency radiations from the Earth's exosphere and the decametric wave-length radiations from Jupiter both result from cyclotron emission by bunches of electrons travelling through their respective exospheres1,2. There are sufficient experimental results available to support strongly this hypothesis of the very-low-frequency radiation and hence by implication the validity of the cyclotron process in an exospheric situation.
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ELLIS, G., MCCULLOCH, P. Decametric Radio Emissions of Jupiter. Nature 198, 275 (1963). https://doi.org/10.1038/198275a0