Competition between Langmuir and upper-hybrid turbulence in a high-frequency-pumped ionosphere.
We show how the secondary escaping radiation, also known as stimulated electromagnetic emission (SEE), from the ionosphere irradiated by a high-intensity radio beam, can be used to study both reflection altitude ponderomotive parametric instabilities and upper-hybrid altitude thermal parametric instabilities. This has allowed us to observe the transfer of energy from smaller to higher sideband frequency offsets and to identify a new transient SEE feature.
Thidé
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Swedish Institute of Space Physics, P.O. Box 537, Uppsala, Sweden. bt@irfu.se
Sergeev
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Grach
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Leyser
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Carozzi
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