日冕绿线辐射在第18-24太阳活动周的整体自转演化规律  

Global Rotation Evolution of Coronal Green Line Radiation during Solar Cycle 18-24

作　　者：费宇[1] 何瑞雪 邓林华 李春 费润秋 FEI Yu;HE Rui-xue;DEND Lin-hua;LI Chun;FEI Run-qiu(School of Statistics and Mathematics,Yunnan University of Finance and Economics,Kunming 650221;School of Mathematics and Computer Science,Yunnan Minzu University,Kunming 650504;School of Mathematics and Statistics,The University of Melbourne,Parkville VIC 3010)

机构地区：[1]云南财经大学统计与数学学院,昆明650221 [2]云南民族大学数学与计算机科学学院,昆明650504 [3]School of Mathematics and Statistics,The University of Melbourne,Parkville VIC 3010

出　　处：《天文学报》2025年第2期42-52,共11页Acta Astronomica Sinica

基　　金：国家自然科学基金项目(11971421);“兴滇英才支持计划”项目;云南财经大学校级项目(2024H59)资助。

摘　　要：太阳自转在极向磁场和环向磁场的转化过程中起着重要作用,是揭示太阳磁场的起源与演化的关键基础,但是对日冕自转长期演化规律的研究尚未得到明确的结论.使用集合经验模态分解和小波分析,对1939年1月1日到2023年12月31日的日冕绿线辐射强度进行研究.研究结果包括:(1)日冕Fe XIV绿线辐射强度存在的显著周期是15.64 d、27.99 d、70.37 d、162.79 d、314.50 d、1.89 yr、10.30 yr以及11.04 yr,其中前3个周期与日冕自转密切相关;(2)在第18-24活动周范围内,日冕自转的周期长度呈现下降趋势,即日冕自转的速度是不断加快的;(3)日冕自转的周期长度变化与Rieger周期、准双年振荡和准六年振荡密切相关.Solar rotation plays an important role in the conversion of transverse and longitudinal magnetic fields,and is a key basis for revealing the origin and evolution of solar magnetic fields,but the long-term evolution of coronal rotation has not been fully understood.The intensity of coronal green line radiation from January 1,1939 to December 31,2023 is studied using ensemble empirical mode decomposition and wavelet analysis.The findings include:(1)The significant periods of the coronal Fe XIV green line radiant intensity are 15.64 d,27.99 d,70.37 d,162.79 d,314.50 d,1.89 yr,10.30 yr and 11.04 yr,and the first three periods are closely related to the coronal rotation.(2)During the 18-24 solar activity cycle,the period length of coronal rotation shows a downward trend,that is,the coronal rotation speed is constantly accelerating.(3)The period length of coronal rotation is closely related to Rieger period,quasi-biennial oscillation and quasi-six-year oscillation.

关 键 词：太阳:活动 太阳:日冕 方法:统计学 

分 类 号：P182[天文地球—天文学]