The Extended Solar Cycle Tracked High into the Corona

被引:17
作者
Tappin, S. J. [1 ]
Altrock, R. C. [1 ]
机构
[1] USAF, Res Lab, Space Weather Ctr Excellence, Natl Solar Observ, Sunspot, NM USA
基金
美国国家科学基金会;
关键词
Corona; Solar cycle; WIND;
D O I
10.1007/s11207-012-0133-3
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present observations of the extended solar cycle activity in white-light coronagraphs, and compare them with the more familiar features seen in the Fe xiv green-line corona. We show that the coronal activity zones seen in the emission corona can be tracked high into the corona. The peak latitude of the activity, which occurs near solar maximum, is found to be very similar at all heights. But we find that the equatorward drift of the activity zones is faster at greater heights, and that during the declining phase of the solar cycle, the lower branch of activity (that associated with the current cycle) disappears at about 3R (aS (TM)). This implies that during the declining phase of the cycle, the solar wind detected near Earth is likely to be dominated by the next cycle. The so-called "rush to the poles" is also seen in the higher corona. In the higher corona it is found to start at a similar time but at lower latitudes than in the green-line corona. The structure is found to be similar to that of the equatorward drift.
引用
收藏
页码:249 / 261
页数:13
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