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Excitation of heater-enhanced plasma and ion lines near the reflection level of a high-frequency pump wave

Published online by Cambridge University Press:  31 January 2002

N. D. BORISOV  and
T. HAGFORS
N. D. BORISOV
Affiliation:
Permanent address: Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN), 142092 Troitsk, Moscow Region, Russia
T. HAGFORS
Affiliation:
Max-Planck Institut für Aeronomie, 37191 Katlenburg–Lindau, Germany
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Abstract

A theory of enhanced plasma and ion lines near the reflection height of a pump wave is presented. It is argued that the high-frequency pressure of the pump wave and the averaged pressure of plasma waves localized in small-scale cavitons contribute to the rapid creation of a cavity in the main Airy maximum. Langmuir waves excited later by parametric decay instability are trapped in such a nonstationary cavity. Analytical expressions for adiabatic eigenmodes of Langmuir waves in a nonstationary cavity are presented. Collisionless attenuation of the eigenmodes of Langmuir waves trapped in the cavity is investigated. It is shown that parametric decay instability in a cavity may account for the excitation of plasma and ion-acoustic waves measured by EISCAT UHF radar.

Type
Research Article
Information
Journal of Plasma Physics , Volume 66 , Issue 1-2 , July 2001 , pp. 71 - 89
Copyright
2001 Cambridge University Press

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