EISCAT observations of pump-enhanced plasma temperature and optical emission excitation rate as a function of power flux
EISCAT observations of pump-enhanced plasma temperature and optical emission excitation rate as a function of power flux
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DOI：
10.1029/2012ja017897/abstract
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发表时间：
2012-09
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影响因子：
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通讯作者：
C. Bryers;M. Kosch;A. Senior;M. Rietveld;T. Yeoman
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文献类型：
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作者：
C. Bryers;M. Kosch;A. Senior;M. Rietveld;T. Yeoman
我们利用具有一定有效辐射功率范围的EISCAT加热器，分析了高功率高频无线电波引起的光发射和电子温度的增强与功率通量的关系。超高频雷达用于测量电子温度和密度。利用数字全天成像仪记录了630.0 nm的光发射强度。我们量化了由于d区自吸收（通常为3-11 dB）和f区折射引起的HF通量损失，以确定达到高混合共振高度的通量。我们发现HF通量与温度增强和光发射激发率之间存在准线性关系，阈值为~ 37.5 μWm−2。在高杂化共振高度处，平均约70%的HF通量用于加热高于阈值的电子，而低于阈值的则为40%。
We analyze optical emissions and enhanced electron temperatures induced by high power HF radio waves as a function of power flux using the EISCAT heater with a range of effective radiated powers. The UHF radar was used to measure the electron temperatures and densities. The Digital All Sky Imager was used to record the 630.0 nm optical emission intensities. We quantify the HF flux loss due to self-absorption in the D-region (typically 3–11 dB) and refraction in the F-region to determine the flux which reaches the upper-hybrid resonance height. We find a quasi-linear relationship between the HF flux and both the temperature enhancement and the optical emission excitation rate with a threshold at ∼37.5 μWm−2. On average ∼70% of the HF flux at the upper-hybrid resonance height goes in to heating the electrons for fluxes above the threshold compared to ∼40% for fluxes below the threshold.