摘要
分析了２２太阳活动周（１９８６．１—１９９５．６；ＣＲ１７７１—ＣＲ１８９８）冕洞对地磁扰动的长期效应和短期效应。作为长期效应，赤道冕洞数和面积指数随太阳活动周的演化与同期的地磁Ａｐ指数的长期变化基本一致，二者在α＝０．０１的信度水平上密切相关，表明赤道冕洞不仅对低年的磁扰有贡献，而且对峰年期间地磁扰动的贡献也是不可忽视的。对冕洞的短期地磁效应的研究表明，不论哪种类型的冕洞，在它们过中经后的１—４天，地磁Ａｐ指数都有不同程度的增长；大冕洞比小冕洞引起的地磁效应较强烈；
The long and short term effects of the coronal holes to the geomagnetical field are analysed in this paper.The evolution of the equatorial coronal holes with the solar acticity cycle is closely related to the geomagnetic disturbances on belief level of =0.01.It is found that the contributton of the equatorial coronal holes to the geomagnetic disturbance is not only at the solar activity minimun but also at the solar activity maximun.The result of the short term effect of the coronal holes to the geomagnetic field proved that the coronal holes is a source of the cyclical geomagnetic disturbance.
出处
《云南天文台台刊》
CSCD
1997年第2期48-54,共7页
Publications of the Yunnan Observatoty
基金
国家自然科学基金和中科院天文口资助
