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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Geomagnetic storms over the last solar cycle: A superposed epoch analysis
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Geomagnetic storms over the last solar cycle: A superposed epoch analysis

机译：地磁风暴过去太阳周期:一个叠加分析时代

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摘要

Presented here is a discussion of the results of a superposed epoch analysis of geomagnetic storms over the last solar cycle. Storms, identified by means of their characteristic SYM‐H evolution, are separated by size into weak (-150 < SYM‐H ≤ -80) nT, moderate (-300 < SYM‐H ≤ -150) nT, and intense (SYM‐H ≤ -300) nT categories. Where possible, the corresponding solar wind (SW) onset mechanisms were located by means of 1 min ACE OMNI data. Intense storms were observed to be driven solely by coronal mass ejections (CMEs); moderate storms were dominated by CME onset, while only weak storms were driven by both CMEs and corotating interaction regions (CIRs) at a ratio of ～2:1, respectively. As might be expected, more intense storms resulted from the largest SW enhancements. Individual storm phase durations for different storm sizes were investigated, revealing that the duration of the main phase increases with storm size to a critical point, then decreases for more intense storms, contrary to the findings of a previous study by Yokoyama and Kamide (1997). Various SW‐magnetosphere coupling functions were investigated for this data set in an attempt to estimate storm size from SW conditions.
机译：本文讨论的结果叠加的时代分析地磁风暴在上一个太阳周期。意味着他们的地理特征符号H进化,按大小分开成弱(-150 < SYM量H≤-80) nT,温和派都会(- 300 <‐H≤SYM - 150)和特斯拉,激烈的(信谊H≤-300)应承担的nT类别。可能的话,相应的太阳风(SW)发病机制是通过1分钟的王牌全方位的数据。完全由日冕物质抛射(cme);温和的风暴是由芝加哥商品交易所,而只有弱的风暴是由太阳风暴和共转交互区域(cir)分别~ 2:1的比例。预期,更强烈的风暴造成的西南最大的增强。持续时间为不同大小的风暴调查,暴露的持续时间主要阶段随风暴大小临界点,然后减少更强烈风暴,与以前的结果相反Yokoyama和Kamide(1997)。SW磁层耦合功能这个数据集,以调查估计风暴大小从西南的条件。

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