The correlation between solar and geomagnetic activity - Part 2: Long-term trends
文献类型：期刊论文
| 作者 | Du, Z. L. |
| 刊名 | ANNALES GEOPHYSICAE
 |
| 出版日期 | 2011 |
| 卷号 | 29期号:8页码:1341-1348 |
| 关键词 | Geomagnetism and paleomagnetism Time variations, secular and long term |
| 英文摘要 | Using lag-correlation function analysis, the correlation coefficient at zero lag (r(0)), the maximum (r(m)) and the corresponding lag time (L-m) between solar (R-z) and geomagnetic (aa) activity for a 528-month (44-year) running time window are shown to vary in a declining, declining and rising secular trend, respectively, before 1958. However, these trends changed since 1958 with a rising secular trend in both r(0) and r(m) and without a significant trend in L-m, probably related to a periodicity longer than 140 years. An odd-numbered solar cycle tends to show a higher correlation and a shorter lag time between R-z and aa than the previous even-numbered one, suggesting a 2-cycle periodicity superimposed on secular trends. An even-numbered Hale cycle tends to show a higher correlation and a shorter lag time between R-z and aa than the previous odd-numbered one, suggesting a 4-cycle periodicity superimposed on secular trends. The variations in the correlations may be related to the non-linearity between R-z and aa, and the decreasing trend in the correlation (r(0)) is not exclusively caused by the increasing trend in the lag time of aa to R-z. These results represent an observational constraint on solar-dynamo models and can help us gain a better understanding of the long-term evolution of solar activities. In applications, therefore, cautions must be taken when using the correlation for molding the dynamical process of the Sun and for predicting solar activities. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000294455800002 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7975]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | Chinese Acad Sci, Key Lab Solar Act, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Du, Z. L.. The correlation between solar and geomagnetic activity - Part 2: Long-term trends[J]. ANNALES GEOPHYSICAE,2011,29(8):1341-1348. |
| APA | Du, Z. L..(2011).The correlation between solar and geomagnetic activity - Part 2: Long-term trends.ANNALES GEOPHYSICAE,29(8),1341-1348. |
| MLA | Du, Z. L.."The correlation between solar and geomagnetic activity - Part 2: Long-term trends".ANNALES GEOPHYSICAE 29.8(2011):1341-1348. |
入库方式： OAI收割
来源：国家天文台
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