Ionospheric and Magnetospheric Modifications Caused by VLF Waves.
REGIS COLL WESTON MA
Pagination or Media Count:
The ionosphere and the magnetosphere may be significantly modified by the injected VLF waves via the thermal filamentation instability and the excitation of lower hybrid waves. In VLF wave injection experiments performed, for example, at Siple, Antarctica, the ground based transmitters are usually operated in a pulsed-wave mode with durations of a few seconds. These VLF wave pulses were used to study coherent wave-particle interactions in the magnetosphere such as the wave amplification, the triggering of wave emissions, the induced particle precipitation etc. see e.g., Helliwell, 1983. We show in this paper that if the transmitters are operated continuously for a few minutes, significant ionospheric and magnetospheric disturbances can be caused by the following two processes. One is the thermal filamentation of the pump wave and the other one is the excitation of lower hybrid waves.
- Atmospheric Physics
- Plasma Physics and Magnetohydrodynamics