Abstract
An iterative procedure based on R. A. Helliwell's theory is used to compute frequency-versus-time spectral shapes of VLF discrete emissions for various field line and electron stream parameters. A quasi-constant stream produces symmetrical emissions (symmetrical generation about the equator), and superimposed microbursts produce hooks with branching risers. Parameters appropriate to quiet and storm conditions produced the observed characteristics of Q chorus and S chorus, respectively. A general feature of the computed position of the interaction region for constant electron streams of low spectral index is an almost sinusoidal motion of the interaction position about the equatorial plane. An analytic expression derived for the period of this motion shows that such periodic motion will occur for electron spectral indices less than about 2.4. A mechanism for nondispersed, multiphase periodic emissions is suggested in terms of this periodic drift motion.
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