Correlated auroral and VLF wave emissions have been identified at L = 4 during simultaneous recordings of TV auroral images and broadband VLF emissions. Both these emissions are characterized by two sequential, nearly harmonic frequency components at about 1.3 and 3 Hz. A model is proposed on the basis of several assumptions. The 1.3‐ and 3.0‐Hz components are presumed to be associated with strong pitch angle scattering via the cyclotron resonance interaction, when the flux levels of two different populations of energetic electrons exceed the flux trapping limit. The 3‐Hz oscillation then arises from half‐bounce time resonance when a flux of high‐energy electrons (∼100 keV) drifts onto the flux tube of interest. In turn, the 3‐Hz oscillation gives rise to a 1.3‐Hz oscillation in the background low‐energy electrons (∼20 keV) via the half‐bounce resonance condition.
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Hansen et al. (1988) studied this question.
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