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arXiv 1111.4000astro-ph.SR
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最大日冕物质抛射速度作为太阳和地磁活动的指示

Maximum Coronal Mass Ejection Speed as an Indicator of Solar and Geomagnetic Activities

A. Kilcik, V. B. Yurchyshyn, V. Abramenko, P. R. Goode, N. Gopalswamy, A. Ozguc, J. P. Rozelot

摘要:

我们调查的日冕物质抛射(CME),国际太阳黑子数(ISSN),地磁Dst和Ap指数覆盖1996-2008年的时间间隔(太阳活动周23)的月平均最大速度之间的关系。我们的新发现如下。(1)月平均最大日冕物质抛射速度与太阳黑子数、Ap和Dst指数之间存在显著关系。月Dst指数中的各种特性与CME速度剖面中的精细结构的相关性比ISSN数据中的好。(2)与太阳黑子数量不同,CME速度指数并没有呈现出双峰最大值。相反,日冕物质抛射的速度曲线在太阳活动周期23的下降阶段达到峰值。与Ap指数类似,CME速度和Dst指数都落后于太阳黑子数量数月。(3)日冕物质抛射的数值显示了一个类似于太阳黑子数值的双峰。即使在第23太阳活动周的最小值附近,日冕物质抛射的发生率仍然很高,当时太阳黑子数量和日冕物质抛射的平均最大速度都达到了最小值。(4)一个定义明确的峰值之间的Ap指数2002年5月和2004年8月是共时的过剩的中纬度冕洞在太阳活动周期23。上述结果表明,CME速度指数可能是太阳活动和地磁活动的一个有用指标。它可能比太阳黑子数量更有优势,因为它更好地反映了地球定向太阳爆发的强度。

英文摘要:

We investigate the relationship between the monthly averaged maximal speeds of coronal mass ejections (CMEs), international sunspot number (ISSN), and the geomagnetic Dst and Ap indices covering the 1996-2008 time interval (solar cycle 23). Our new findings are as follows. (1) There is a noteworthy relationship between monthly averaged maximum CME speeds and sunspot numbers, Ap and Dst indices. Various peculiarities in the monthly Dst index are correlated better with the fine structures in the CME speed profile than that in the ISSN data. (2) Unlike the sunspot numbers, the CME speed index does not exhibit a double peak maximum. Instead, the CME speed profile peaks during the declining phase of solar cycle 23. Similar to the Ap index, both CME speed and the Dst indices lag behind the sunspot numbers by several months. (3) The CME number shows a double peak similar to that seen in the sunspot numbers. The CME occurrence rate remained very high even near the minimum of the solar cycle 23, when both the sunspot number and the CME average maximum speed were reaching their minimum values. (4) A well-defined peak of the Ap index between 2002 May and 2004 August was co-temporal with the excess of the mid-latitude coronal holes during solar cycle 23. The above findings suggest that the CME speed index may be a useful indicator of both solar and geomagnetic activities. It may have advantages over the sunspot numbers, because it better reflects the intensity of Earth-directed solar eruptions.

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