Dependence of stimulated electromagnetic emission on the ionosphere and pump wave

Journal Article · Mon Oct 01 04:00:00 EDT 1990 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/JA095iA10p17233· OSTI ID:5027741

Leyser, T B; Thide, B; Derblom, H; Hedberg, A; Lundborg, B ^[1]; Stubbe, P; Kopka, H ^[2]

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1. Swedish Inst. of Space Physics, Uppsala (Sweden)
2. Max-Planck Inst. fur Aeronomie, Katlenburg-Lindau (West Germany)

Electromagnetic emission, stimulated by a powerful high frequency radio wave injected into the ionospheric F region, exhibits a rich spectral structure in the sidebands of the reflected pump wave. Results from such experiments at the Heating facility near Tramso, Norway, are presented. Spectral features in a steady state, a few seconds after the onset of the pump, are shown to depend on ionospheric conditions, the pump frequency, and power. Different types of stimulated radiation spectra may be obtained when the ionospheric critical frequency is well above or near the pump frequency. Further, the appearance of the spectral features is very sensitive to the pump frequency near harmonics of the F region electron cyclotron frequency. The interpretaton is that the considered stimulated electromagnetic emissions are generated primarily in two interacton regions, the plasma resonance region at the pump reflection height and the upper hybrid resonance region, typically a few kilometers below the reflection height.

• OSTI ID: 5027741
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 95:A10; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CRITICAL FREQUENCY
DATA
EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
EMISSION
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
F REGION
GROUND LEVEL
INFORMATION
IONOSPHERE
LEVELS
NUMERICAL DATA
PLANETARY IONOSPHERES
RADIATIONS
RADIOWAVE RADIATION
STEADY-STATE CONDITIONS
STIMULATED EMISSION