Abstract
MANY plasma-wave phenomena involving the proton gyrofrequency have been observed in the ionosphere and magnetosphere but very few involving the helium gyrofrequency. One such is the phenomenon known as helium whistlers which were discovered by Barrington, Belrose and Mather1 with the Canadian Alouette II satellite. Horita and Friesen2 have also reported fine structure at harmonics of the proton and helium gyrofrequency on whistlers detected by the v.l.f. receiver on board the Canadian Isis II satellite. Another paper3, reporting proton gyrofrequency phenomena on auroral hiss, mentioned parenthetically that extra low frequency hiss modulated at harmonics of the helium gyrofrequency has been observed. Here I give further details of the e.l.f. hiss modulation and discuss the region where the modulation may possibly have occurred.
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HORITA, R. e.l.f. Hiss modulation at harmonics of the helium gyrofrequency. Nature 261, 398 (1976). https://doi.org/10.1038/261398a0
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DOI: https://doi.org/10.1038/261398a0
