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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >An empirical relationship between coronal mass ejection initial speed and solar wind dynamic pressure
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An empirical relationship between coronal mass ejection initial speed and solar wind dynamic pressure

机译：实证日冕物质之间的关系太阳风弹射初始速度和动态的压力

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Interplanetary shocks that precede coronal mass ejections (CMEs) are mainly responsible for sudden impulses, which are characterized by a simple step-like increase in the horizontal H component. Such a magnetic field change has been explained as a compression of the magnetosphere by the passage of a sudden increase in the solar wind dynamic pressure. Strong compression of the dayside magnetopause could cause geosynchronous satellites to be exposed to solar wind environments where large fluctuations of the interplanetary magnetic field and highly energetic particles are present. In this study, we chose 26 event pairs consisting of a type II burst/CME occurring in conjunction with a sudden commencement/sudden impulse (SC/SI) whose solar wind, and Earth magnetic field data are available. We then investigated relationships among three physical properties (kinetic energy, directional parameter, and speed) of near-Sun CMEs, solar wind dynamic pressure, and SC/SI amplitude. As a result, we found that (1) the CME speed is more highly correlated with SC/SI amplitude than its kinetic energy and direction parameter; (2) by adopting the empirical relationship between solar wind dynamic pressure and amplitude of symmetric H (a steplike increase in the horizontal H component at low latitude), we could derive an empirical formula for the relationship between solar wind dynamic pressure near the Earth and the CME speed; (3) the CME speed has a linear relationship with the difference of magnetopause locations derived by using the model of Shue et al. (1998) at the subsolar point before and after the shock arrivals; (4) a fast CME greater than 1600 km s~(-1) could be a driver of the magnetopause crossing of a spacecraft at geosynchronous orbit. Our results show that the CME speed is an important parameter for early prediction of geosynchronous magnetopause crossing.
机译：星际冲击之前的日冕主要负责抛射(cme)突然的冲动,它的特点是简单的梯状水平增加H组件。解释为一个压缩的磁场突然增加的流逝的太阳能风动态压力。的光面磁层可能会导致同步卫星受到太阳风大的波动的环境中行星际磁场和高度高能粒子。我们选择26事件对II型组成的破裂/ CME与突然发生毕业典礼/冲动(SC / SI)的太阳能风,和地球磁场数据可用。在三个物理性质(动能,近的定向参数和速度)cme,太阳风动压和SC / SI振幅。速度与SC / SI更高度相关振幅比其动能和方向参数;太阳风动压之间的关系和对称H (steplike增加幅度在水平H组件纬度较低),我们可以得到的经验公式太阳风动压之间的关系地球和芝加哥商品交易所附近的速度;速度有一个线性关系得到了不同的磁层位置使用的模型·苏et al . (1998)日下点前后的冲击移民;s ~(1)可能是一个司机的磁层穿越地球同步轨道的航天器。我们的结果表明,芝加哥商品交易所是一个速度早期预测的重要参数同步磁层。

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