电离层加热实验中非常波的异常衰减：2000-2001年的实验结果
Anomalous attenuation of extraordinary waves in ionosphere heating experiments: experimental results of 2000-2001
摘要：
在电离层F区由高频引起的人工随机不规则结构的多重散射导致寻常和非常无线电波的显著衰减，以及由于它们转换成等离子体波而导致的寻常波的常规异常吸收。为了研究这种效应的详细特征，在苏拉加热设施上对非常极化的弱探测波的衰减进行了有目的的测量。所涉及的不规则性的特征尺度长度在地磁场线上约为0.1-1公里。为了从非常规探测波衰减测量中确定这些不规则体的频谱特性，实施了一个简单的反问题求解过程，并得出了关于人工不规则体特征的一些结论。理论和实验的细节已经在前面叙述过了。本文报道了在俄罗斯基础研究基金会（资助号：99-02-17525和01-02-31008）的支持下，于2000年8月和2001年6月进行的两次实验活动的结果。这些实验的特殊性在于使用较低的加热功率（20-80 MW ERP）。证实了多次散射效应的规律性。
英文摘要：
Multiple scattering from artificial random irregularities HF-induced in the ionosphere F region causes significant attenuation of both ordinary and extraordinary radio waves together with the conventional anomalous absorption of ordinary waves due to their conversion into the plasma waves. To study in detail features of this effect, purposeful measurements of the attenuation of weak probing waves of the extraordinary polarization have been performed at the Sura heating facility. Characteristic scale lengths of the involved irregularities are ~0.1-1 km across the geomagnetic field lines. To determine the spectral characteristics of these irregularities from the extraordinary probing wave attenuation measurements, a simple procedure of the inverse problem solving has been implemented and some conclusions about the artificial irregularity features have been drawn. Theory and details of experiments have been stated earlier. This paper reports results of two experimental campaigns carried out in August 2000 and June 2001 under support of Russian Foundation for Basic Research (grants No. 99-02-17525 and No. 01-02-31008). Particularity of these experiments consisted in using of lower heating power (20-80 MW ERP). Regular character of the multiple scattering effects has been confirmed.
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