Interplanetary coronal mass ejections in the near-Earth solar wind during the minimum periods following solar cycles 22 and 23

被引:22
|
作者
Kilpua, E. K. J. [1 ]
Lee, C. O. [2 ]
Luhmann, J. G. [2 ]
Li, Y. [2 ]
机构
[1] Univ Helsinki, Dept Phys, Div Geophys & Astron, FIN-00014 Helsinki, Finland
[2] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
基金
芬兰科学院;
关键词
Interplanetary physics; Interplanetary magnetic fields; MAGNETIC-FIELDS; SOURCE REGIONS; STREAMS; PHASE; MODEL; SHOCK;
D O I
10.5194/angeo-29-1455-2011
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In this paper we examine the occurrence rates and properties of interplanetary coronal mass ejections (ICMEs) and solar activity levels during the minima following solar cycle 22 (January 1995-December 1997) and 23 (January 2007-April 2010) minima using observations from the OMNI data base. Throughout the minimum following cycle 22 the CME and ICME rates roughly tracked each other, while for the minimum following cycle 23 they diverged. During the minimum after solar cycle 23, there were large variations in the streamer belt structure. During the lowest activity period of cycle 23 (based on sunspot numbers), the ICME rate was about four times higher than during a similar activity period of cycle 22. We propose that this relatively high ICME rate may be due to CME source regions occurring at lower heliolatitudes and due to equatoward deflection of slow and weak CMEs originating from the mid-and high-heliolatitudes. The maximum magnetic fields of the ICMEs identified during the minimum following cycle 23 were similar to 30% lower and their radial widths were similar to 15% lower compared to the ICMEs observed during the minimum following solar cycle 22. The weak and small ICMEs may result from intrinsically weak CMEs and/or they may represent stronger CMEs that are encountered far away from the center.
引用
收藏
页码:1455 / 1467
页数:13
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