Excitation of artificial airglow by high power radio waves from the “SURA” Ionospheric Heating Facility
Excitation of artificial airglow by high power radio waves from the “SURA” Ionospheric Heating Facility
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DOI：
10.1029/91gl01847
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发表时间：
1991-08
影响因子：
5.2
通讯作者：
P. Bernhardt;W. Scales;S. Grach;A. N. Keroshtin;D. Kotik;S. Polyakov
中科院分区：
文献类型：
--
作者：
P. Bernhardt;W. Scales;S. Grach;A. N. Keroshtin;D. Kotik;S. Polyakov
SURA设施用于产生高功率无线电波，位于苏联Vasil'sursk村附近，工作频率为4.5至9.0 MHz，最大有效辐射功率为300 MW。HF无线电波与F层等离子体之间的非线性相互作用发生在电磁波反射点附近。高能电子被静电波加速离开相互作用区。这些超热电子碰撞激发环境氧原子产生增强的气辉。1990年9月在SURA进行了微光光学测量。增强的红线（630 nm）发射的图像记录在无线电波传输在4.786，5.455和5.828 MHz。天线的辐射模式，电离层的不规则性，和磁场的方向影响了所观察到的气辉结构的形状。气辉云在夜空中飘过，消失，在天线阵的最高点重新凝聚。这已被解释在漂移等离子体的不规则性和分叉时，光束分裂两个密度腔的无线电光束折射。作者的经验表明，在晴空条件下，微光成象技术是研究大尺度不规则性和用大功率高频发射设备进行电子加速的可靠方法。
The SURA facility for generation of high power radio waves, located near the village of Vasil'sursk USSR, operates between 4.5 and 9.0 MHz and has a maximum effective radiated power (ERP) of 300 MW. Nonlinear interactions between the HF radio waves and F-layer plasma occur near the electromagnetic wave reflection point. Energetic electrons are accelerated out of the interaction regions by the electrostatic waves. Ambient oxygen atoms collisionally excited by these suprathermal electrons yield enhanced airglow. Low-light-level, optical measurements were made at SURA during September 1990. Images of enhanced red-line (630 nm) emissions were recorded during radio wave transmissions at 4.786, 5.455, and 5.828 MHz. The antenna radiation pattern, ionospheric irregularities, and the magnetic field orientation affected the shape of the observed airglow structures. The airglow clouds drifted across the night sky, disappeared, and reformed at the zenith of the antenna array. This has been interpreted in terms of radio beam refraction in drifting plasma irregularities and bifurcation when the beam is split between two density cavities. Subject to clear skies, the authors experience indicates that the low-light-level-imaging technique is a reliable method to study large scale irregularities and electron acceleration with high-power HF transmitting facilities.