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首页> 外文期刊>Planetary and space science >Statistical relationship between solar wind conditions and geomagnetic storms in 1998-2008
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Statistical relationship between solar wind conditions and geomagnetic storms in 1998-2008

机译：1998-2008年太阳风与地磁暴的统计关系

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摘要

Applying ACE data and pressure-corrected Dst index (Dst~*), annual distributions of solar wind structures detected at L1 point (the first Lagrangian point between solar-terrestrial interval) and correlations between solar wind structures and geomagnetic storms in 1998-2008 have been studied. It was found that, within the Earth's upstream solar wind, the dominant feature was interplanetary coronal mass ejections (ICMEs), primarily magnetic clouds, during solar maximum period but corotating interaction regions (CIRs) at solar minimum. During rising and declining phases, solar wind features became unstable for the complicated solar corona transition processes between the maximum and minimum phases, and there was a high CIR occurrence rate in 2003, the early period of the declining phase, for the Earth's upstream solar wind was dominated by high-speed southern coronal-hole outflows at that time. The occurrence rate of sector boundary crossing (SBC) events was evidently higher at the late half of declining phase and minimum period. ICMEs mainly centered on the maximum period but CIRs on all the declining phase. The occurrence rate of ICMEs was 1.3 times of that of CIRs, and more than half of ICMEs were magnetic clouds (MCs). Half of magnetic clouds could drive interplanetary shock and played a crucial role for geomagnetic storms generation, especially intense storms (Dst~* ≤ 100 nT), in which 45% were jointly induced by sheath region and driving MC structure. Sixty percent of intense storms were totally induced by shock-driving MCs; moreover, 74% of intense storms were driven by magnetic clouds, 81% of them driven by ICMEs. Shock-driving MC was the most geoeffective interplanetary source for four fifths of it able to lead to storms and more than one-third to intense storms. The rest of intense storms (19%) were induced just by 3% of all detected CIRs, and most of CIRs (53%) were corresponding to nearly 40% moderate and small storms (-100nT
机译：应用ACE数据和经压力校正的Dst指数（Dst〜*），在1998-2008年L1点（太阳-地面间隔之间的第一个拉格朗日点）检测到的太阳风结构的年度分布以及太阳风结构与地磁暴之间的相关性经过研究。研究发现，在地球上游的太阳风中，主要特征是在太阳最大时期内行星际冠状物质抛射（ICME），主要是磁云，而在太阳最小时期则同向相互作用区域（CIR）旋转。在上升和下降阶段，对于最大和最小阶段之间复杂的太阳电晕过渡过程，太阳风特征变得不稳定，并且在地球下降阶段的早期，2003年，地球上游太阳风的CIR发生率很高当时主要是南部高速冠状孔流出。在下降阶段的后半段和最短时期，部门边界越界（SBC）事件的发生率明显更高。 ICME主要以最长期限为中心，而CIR则以所有下降阶段为中心。 ICME的发生率是CIR的1.3倍，ICME的一半以上是磁云（MC）。一半的磁云可以驱动行星际震荡，并且对地磁风暴的产生起着至关重要的作用，特别是强烈风暴（Dst〜*≤100 nT），其中45％是由鞘区和驱动MC结构共同引起的。百分之六十的强风暴完全由震动驱动的MC引起；此外，74％的强风暴是由磁云驱动的，其中81％由ICME驱动。震动驱动的MC是最有效的行星际源，其五分之四的区域可导致风暴，三分之一以上的区域可导致强风暴。其余强风暴（19％）仅由所有检测到的CIR的3％引起，而大多数CIR（53％）对应于近40％的中，小风暴（-100nT

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  • 来源
    《Planetary and space science》 |2009年第12期|1500-1513|共14页
  • 作者

    D. Xu; T. Chen; X.X. Zhang; Z. Liu;

  • 作者单位

    State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, ChinarnGraduate School of the Chinese Academy of Sciences, Beijing 100049, China;

    State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China;

    National Center for Spaceweather, China Meteorological Administration, Beijing 100081, China;

    State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China;

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  • 正文语种 eng
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  • 关键词

    geomagnetic storms; solar cycle; space weather; solar wind structures;

    机译：地磁风暴;太阳周期空间天气;太阳风结构;

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