Altitude and intensity characteristics of parametric instability excited by an HF pump wave near the fifth electron harmonic

Jun WU (吴军); Jian WU (吴健); M T RIETVELD; I HAGGSTROM; Haisheng ZHAO (赵海生); Zhengwen XU (许正文)

doi:10.1088/2058-6272/aa9027

Plasma Science and Technology > 2017 > 19(12): 125303. > DOI: 10.1088/2058-6272/aa9027

Jun WU (吴军), Jian WU (吴健), M T RIETVELD, I HAGGSTROM, Haisheng ZHAO (赵海生), Zhengwen XU (许正文). Altitude and intensity characteristics of parametric instability excited by an HF pump wave near the fifth electron harmonic[J]. Plasma Science and Technology, 2017, 19(12): 125303. DOI: 10.1088/2058-6272/aa9027

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Altitude and intensity characteristics of parametric instability excited by an HF pump wave near the fifth electron harmonic

1 National Key Laboratory of Electromagnetic Environment, China Research Institute of Radio Wave Propagation, Beijing 102206, People’s Republic of China 2 EISCAT, NO-9027 Ramfjordbotn, Norway 3 UiT, The Arctic University of Norway, Tromsø, Norway 4 EISCAT Scienti?c Association, Kiruna, Sweden

Funds: The EISCAT Scientific Association is supported by China (China Research Institute of Radio Wave Propagation), Finland (Suomen Akatemia of Finland), Japan (the National Institute of Polar Research of Japan and Institute for Space-Earth Environmental Research at Nagoya University), Norway (Norges Forkningsrad of Norway), Sweden (the Swedish Research Council) and the UK (the Natural Environment Research Council).

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Received Date: August 08, 2017

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Abstract

Abstract

An ionospheric heating experiment involving an O mode pump wave was carried out at European Incoherent Scatter Scientific Association site in Tromsø. The observation of the ultra high frequency radar illustrates the systematic variations of the enhanced ion line and plasma line in altitude and intensity as a function of the pump frequency. The analysis shows that those altitude variations are due to the thermal effect, and the intensity variations of the enhanced ion line are dependent on whether or not the enhanced ion acoustic wave satisfy the Bragg condition of radar. Moreover, a prediction that if the enhancement in electron temperature is suppressed, those systematic variations will be absent, is given.
- ionospheric heating,
- fifth harmonic,
- parameter instability,
- altitude,
- intensity

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Altitude and intensity characteristics of parametric instability excited by an HF pump wave near the fifth electron harmonic