Tromsoe heating experiments: Stimulated emission at HF pump harmonic and subharmonic frequencies

Journal Article · Tue Aug 01 04:00:00 EDT 1989 · Journal of Geophysical Research; (USA)

OSTI ID:5837783

Derblom, H; Thide, B; Leyser, T B; Nordling, J A; Hedberg, A ^[1]; Stubbe, P; Kopka, H; Rietveld, M ^[2]

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

Observations of electromagnetic emissions on the HF heater subharmonic and several harmonic frequencies are presented. Often the second harmonic emissions show characteristic amplitude variation, frequency shift, and spectral broadening that clearly have their origin in ionospheric plasma processes. The strongest candidate is a combined parametric decay and Raman up-conversion processes. The subharmonic emission is believed to be evidence of absolute stimulated Raman scattering and/or two plasmon decay processes which have not been observed before in ionospheric heating experiments.

• OSTI ID: 5837783
• Journal Information: Journal of Geophysical Research; (USA), Journal Name: Journal of Geophysical Research; (USA) Vol. 94:A8; 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
AMPLITUDES
EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
HEATING
INSTABILITY
IONOSPHERE
LINE BROADENING
ORIGIN
PARAMETRIC INSTABILITIES
PLANETARY IONOSPHERES
PLASMA
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
PLASMA WAVES
PLASMONS
QUASI PARTICLES
RADIATIONS
RADIOWAVE RADIATION
SCATTERING