Measurements and modeling of cosmic noise absorption changes due to radio heating of the D region ionosphere

A. Senior; M. T. Rietveld; F. HonaryW. SingerM. J. Kosch

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Measurements and modeling of cosmic noise absorption changes due to radio heating of the D region ionosphere

机译：宇宙噪声的测量和建模吸收变化由于无线电加热的D地区电离层

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Powerful high-frequency radio waves can heat the electrons in the D region of the ionosphere. This heating increases the electron-neutral collision frequency which modifies the absorption of other radio waves propagating through the heated plasma. A high spatial resolution imaging riometer was used to observe changes in cosmic radio noise absorption (CNA) induced by heating from the European Incoherent Scatter (EISCAT) HF facility, and the results were compared to a theoretical model using observed electron densities as an input. The model is found to overestimate the observed effect by a factor close to 2, despite different background electron density profiles and heater powers. However, the model reproduced the spatial morphology of the change in CNA rather well, and the same absorption calculation used in the heating model also reproduced the changes in CNA due to electron precipitation in the absence of heating well. When the assumption of a perfectly conducting ground is replaced with a more realistic model in the calculation of the HF radiated power, the power is reduced to about 75% of its original value, and the model overestimate of the CNA change is reduced to a factor of about 1.3.

机译：强大的高频无线电波可以加热电子在电离层D地区。加热增加electron-neutral碰撞频率修改其他的吸收无线电波传播通过加热等离子体。宇宙噪声测量器被用来观察宇宙的变化无线电噪声引起的吸收(CNA)供暖从欧洲非相干散射(EISCAT)高频设施,和的结果进行了比较使用观察电子理论模型密度作为输入。高估了观察效果的因素接近2,尽管不同的背景电子密度概要文件和加热器的权力。模型复制的空间形态CNA的变化相当好,一样的吸收计算用于加热模型还在CNA由于复制更改电子降水没有供暖好。进行地面被替换为一个更现实的模型计算的高频辐射功率,降低到75%左右的初始值,模型高估了CNA的变化是减少的一个因素1.3.

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《Journal of Geophysical Research, A. Space Physics: JGR》 |2011年第4期|A04310:1-A04310:10|共10页
作者
A. Senior; M. T. Rietveld; F. HonaryW. SingerM. J. Kosch;
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作者单位

Department of Physics, Lancaster University, Lancaster LA1 4YB, UK;

Leibniz-Institute of Atmospheric Physics, Rostock University, Schlossstrasse 6, D-18225 Kuhlungsborn, Germany;

EISCAT Scientific Association, Ramfjordmoen, N-9027 Ramfjordbotn, Norway;

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electron density profiles; HIGH-FREQUENCY HEATING; noise absorptionD regionElectron densityelectron precipitationHeatingcosmic noiseradio wavesRadio;

机译：电子密度剖面;高频加热;噪声absorptionD regionElectrondensityelectron precipitationHeatingcosmic;

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Measurements and modeling of cosmic noise absorption changes due to radio heating of the D region ionosphere

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