Variation of Small Scale Magnetic Fields Over a Century using Ca-K Images as Proxy  

作　　者：Jagdev Singh Muthu Priyal B.Ravindra Luca Bertello Alexei Pevtsov 

机构地区：[1]Indian Institute of Astrophysics,II Block,Koramangala,Bengaluru–560034,India [2]National Solar Observatory,3365 Discovery Drive,Third Floor,Boulder,CO 80303,USA

出　　处：《Research in Astronomy and Astrophysics》2023年第4期172-183,共12页天文和天体物理学研究（英文版）

基　　金：supported by the International Space Science Institute (ISSI),Bern,Switzerland and ISSI-Beijing,China。

摘　　要：A combined uniform and long-time series of Ca-K images from the Kodaikanal Observatory,Mount Wilson Observatory and Mauna Loa Solar Observatory was used to identify and study the Ca-K small-scale features and their solar cycle variations over a century.The small scale features are classified into three distinct categories:enhanced network,active network and quiet network.All these features show that their areas vary according to the11 yr solar cycle.The relative amplitude of the Ca-K network variations agrees with that of the sunspot cycle.The total area of these small-scale features varies from about 5%during the minimum phase of the solar cycle to about20%during its maximum phase.

关 键 词：SUN activity-Sun chromosphere-(Sun:)sunspots 

分 类 号：P182[天文地球—天文学]