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On the frequency modulation of VLF emissions

By M. Goncharova and W. Lyatsky


Abstract. The VLF-wave frequency modulation efficiency as a function of magnetosphere plasma parameters under the weak pitch-angle diffusion regime is studied. The study is based on the VLF growth-rate modulation both in the magnetosphere equatorial plane and after integrating along the magnetic field line. It is shown that for the typical quiet magnetosphere plasma parameters the relative shift of the maximum intensity frequency Δω /ω is approximately equal to relative disturbance of the magnetic field in the magnetosphere equatorial plane, but may exceed it when both electron temperature anisotropy and the parameter αβ � are small; here α is the total-to-warm electron content ratio and β � is the electron parallel beta. It is also shown that relative shift of the maximum intensity frequenc

Year: 1995
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