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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Evidence that solar wind fluctuations substantially affect the strengthof dayside ionospheric convection
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Evidence that solar wind fluctuations substantially affect the strengthof dayside ionospheric convection

机译：证据表明太阳风涨落从本质上影响strengthof的光面电离层对流

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Ionospheric convection is occasionally observed to be substantially enhanced evenwhen the interplanetary magnetic field (IMF) is not strongly southward and the IMF By isnot large. Such enhanced convection flows tend to exhibit large oscillations with-40-30 min periodicity. We have considered the solar wind characteristics that leadto these oscillatory convection enhancements. We have used an extensive set ofSondrestrom radar observations of ionospheric convection within the dayside polar cap.We find that IMF ULF power is closely associated with the strength of daysideconvection. Convection flows during periods of large north–south IMF fluctuations areobserved to be as strong as for steady and large southward IMF periods. Enhancedconvection is also observed during northward IMF intervals when the interplanetarymagnetic field exhibits high ULF power. We find that ULF power enhances the convectionstrength, independent of an observed direct effect from the solar wind speed. Theseobservations thus suggest that IMF ULF fluctuations can significantly influenceionospheric convection. Therefore, in addition to the well-established contributions fromthe direction and magnitude of the IMF and the solar wind dynamic pressure, ULFfluctuations may also be an important contributor to coupling of the solar wind to themagnetosphere-ionosphere system. We speculate that resonance between IMF fluctuationsand natural magnetospheric oscillation frequencies or magnetopause boundary oscillationsmight be responsible for the connection between ionospheric convection and IMF ULFpower. We have also found evidence for a connection between the ULF power in the solarwind dynamic pressure and the strength of convection.
机译：电离层对流是偶尔观察到即使被大大提高行星际磁场(IMF)不是强烈向南和IMF并不大。这样增强对流流动往往展览大型振动with-40-30最小周期。认为太阳风特征吗这些振荡,导致对流增强。ofSondrestrom电离层的雷达观测对流的光面极地cap.We内找到国际货币基金组织的ULF权力是密切相关的daysideconvection的力量。大时期南北货币基金组织波动areobserved一样强烈稳定的向南和大型国际货币基金组织(IMF)时期。Enhancedconvection也是期间观察到的国际货币基金组织(IMF)向北间隔时展品高ULF interplanetarymagnetic字段权力。convectionstrength、独立的观察从太阳风速度直接影响。Theseobservations从而表明,国际货币基金组织(IMF)提出波动可以显著influenceionospheric对流。除了完善的贡献从国际货币基金组织和的方向和大小太阳风动态压力,ULFfluctuations也可能是一个重要因素耦合吗themagnetosphere-ionosphere的太阳风系统。fluctuationsand自然磁性层的振荡频率或磁层边界oscillationsmight负责电离层对流和IMF之间的联系ULFpower。solarwind的ULF权力之间的联系动态压力和对流的强度。

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