Variations of magnetic clouds and CMEs with solar activity cycle

被引：0

作者：

Wu, CC ^{[1
]}

Lepping, RP ^{[1
]}

Gopalswamy, N ^{[1
]}

机构：

[1] Univ Alabama, CSPAR, Huntsville, AL 35899 USA

来源：

SOLAR VARIABILITY AS AN INPUT TO THE EARTH'S ENVIRONMENT | 2003年 / 535卷

关键词：

magnetic cloud; CME; storm;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Sixty-eight magnetic clouds observed by Wind during November 1994 - May 2002. The average occurrence rate is similar to9 magnetic clouds per year for the overall period (68 events/7.6 years). It is found that some of the frequency of occurrence anomalies were during the early part of solar cycle 23: (i) only 4 clouds were observed in 1999, (ii) an unusually large number of clouds (16 events) were observed in 1997 in which the Sun was starting to leave solar minimum. During the period of 1996-2001, the results also show : (1) the occurrence frequency of magnetic cloud appears to be related neither to the occurrence of solar coronal mass ejections (CMEs) as observed by SOHO nor to solar activity cycle, (2) the intensity of geomagnetic storms related to magnetic clouds is affected by both solar activity and the occurrence frequency of CMEs, and (3) similar to91% of magnetic clouds induced geomagnetic storms.

引用

页码：429 / 432

页数：4

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