Abstract
Correlated auroral and VLF emissions have been identified at L = 4 during simultaneous recordings of TV auroral images and broadband VLF. Pulsation frequencies of 1.3 ± 0.4 Hz and 3.0 ± 0.4 Hz are prominent in the power spectra of both the VLF and the optical intensity variations. These are shown to be consistent with an external oscillator source driving at a frequency of about 3 Hz. The external source induces wave growth and strong pitch angle scattering via the cyclotron resonance interaction when the electron pitch angle distribution function is such that the flux levels exceed the trapping limit.
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© 1988 Kluwer Academic Publishers
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Hansen, H.J., Mravlag, E., Scourfield, M.W.J. (1988). Half Bounce-Period Auroral Pulsations. In: Rodrigo, R., López-Moreno, J.J., López-Puertas, M., Molina, A. (eds) Progress in Atmospheric Physics. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3009-4_14
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DOI: https://doi.org/10.1007/978-94-009-3009-4_14
Publisher Name: Springer, Dordrecht
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