Modulation of the polar electrojet by powerful HF waves
Modulation of the polar electrojet by powerful HF waves
复制标题
通过强大的高频波调制极性电喷射
DOI：
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
H. Kopka
中科院分区：
文献类型：
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作者：
P. Stubbe;H. Kopka
在电离层改造实验中使用的强大无线电波可以非常有效地加热电离层下层的电子气体。如果发射机以脉冲重复率f工作在脉冲模式下，则电子温度将以频率f振荡，从而导致电导率的周期性变化。因此，如果电离层中存在直流电流，则将在其上叠加一个交流分量。因此，修正后的电离层区域将辐射频率为f的电磁波。本文对电离层内产生的极低频或极低频波的功率进行了估计。在典型的极性电喷条件下，根据马克斯-普朗克研究所（林道）预测的修正实验参数，在10千赫左右的频率上可能产生几千瓦的功率。我们还发现，在极低的频率下，大约10−2 Hz，可以激发振幅为几个10−1 γ的磁场脉动。
Powerful radio waves, as they are used in ionospheric modification experiments, can very efficiently heat the electron gas of the lower ionosphere. If the transmitter operates in a pulsed mode with the pulse repetition rate f, the electron temperature will oscillate with frequency f and thus lead to periodic changes of the electric conductivity. Thus if a dc current is present in the ionosphere, an ac component will be superimposed upon it. As a result the modified ionospheric region will radiate electromagnetic waves with frequency f. An estimate of the power of these very or extremely low frequency waves produced within the ionosphere is performed in this paper. For typical polar electrojet conditions and with the parameters of the modification experiment projected by Max-Planck-Institut (Lindau) a power of a few kilowatts appears possible at frequencies around 10 kHz. It is also found that at extremely low frequencies, around 10−2 Hz, pulsations of the magnetic field with an amplitude of a few 10−1 γ may be excited.