The Influence of Shearing Neutral Winds on the Two Stream Instability in the Equatorial Electrojet
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摘要: 本文导出了在由中性风引起的垂直电流的条件下, 赤道电射流中双流不稳定性的相速度, 增长率和饱和水平的修正公式.在通常电射流条件下, 密度为2×10-7A/m2的垂直电流对不稳定性有一定的影响.当驱动电场接近不稳定性的临界值时, 上述垂直电流有着决定性的影响.本文结果说明反向电射流期间十分强的半周日潮汐风引起的垂直电流可能是使“H”型不稳定性饱和水平十分高的原因之一.Abstract: The influence of the vertical current driven by some shearing neutral winds an the dispertion relation, the growth rate and the saturated turbulence level of the two-stream instability in the equatorial electrojet is discussed. For j⊥~2×10-7A/m2, the influence is obvious and can be significant when the driven electric field approches the critical value of the instability. It is shown that the vertical current driven by semidiurnal tidal winds is one of the possible reasons of the high turbulence level of type "H" echoes observed during the counter-electrojet.
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