Parametric instability producing broad symmetrical structure in the spectrum of ionospheric heating-induced radiation

Journal Article · Mon Sep 01 04:00:00 EDT 1997 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.872459· OSTI ID:538464

Kuo, S P ^[1]

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1. Department of Electrical Engineering, Polytechnic University, Route 110, Farmingdale, New York 11735 (United States)

A four-wave interaction process in which an O-mode electromagnetic pump decays parametrically into a lower hybrid decay mode and two-electron Bernstein sidebands is analyzed. It is shown that the instability can be excited in a spatial region near the electron Bernstein/upper hybrid double resonance and in a narrow pump frequency range slightly below the third harmonic electron cyclotron resonance. The two electron Bernstein sidebands have about the same intensity and thus, produce Broad Symmetrical Structure (BSS) in the emission spectrum after being converted into electromagnetic radiation by scattering off background field-aligned density irregularities. The results also show that the size of the instability zone becomes very small as the pump frequency operates near a cyclotron harmonic higher than the third. Thus, the converted emission will be too weak to be detected. This explains why the BSS feature in the spectrum of stimulated electromagnetic emissions (SEEs) has only been observed in the third harmonic case. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 538464
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 9 Vol. 4; ISSN 1070-664X; ISSN PHPAEN
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BERNSTEIN MODE
CYCLOTRON HARMONICS
IONOSPHERE
PARAMETRIC INSTABILITIES
PLASMA HEATING
PLASMA WAVES
STIMULATED EMISSION