Periodicities in photospheric magnetic flux  

作　　者：SONG Wenbin WANG Jingxiu 

机构地区：[1]National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2006年第2期246-256,共11页中国科学：物理学、力学、天文学（英文版）

基　　金：the National Natural Science Foundation of China (Grant No. 10233050); the National Key Basic Research Science Foundation (Grant No. G2000078404).

摘　　要：Magnetic field plays an important role in solar structure and activity. In prin-ciple, the determination of magnetic flux would provide the best general-purpose index of solar activity. Currently, the periodicity studies corresponding to photospheric magnetic flux (PMF) are very few possibly due to the absence of a uniform flux sequence. In this paper, by using 383 NSO/Kitt Peak magnetic synoptic charts we reconstruct a flux se-quence from February 1975 to August 2003 and perform a relatively systemic periodicity analysis with two methods of the Scargle periodogram and the Morlet wavelet transform. As a result, four periods are found at around 1050, 500, 300 and 160 days. We analyze these periods’ temporal variabilities in detail and discuss their respective origins briefly.Magnetic field plays an important role in solar structure and activity. In prin-ciple, the determination of magnetic flux would provide the best general-purpose index of solar activity. Currently, the periodicity studies corresponding to photospheric magnetic flux (PMF) are very few possibly due to the absence of a uniform flux sequence. In this paper, by using 383 NSO/Kitt Peak magnetic synoptic charts we reconstruct a flux se-quence from February 1975 to August 2003 and perform a relatively systemic periodicity analysis with two methods of the Scargle periodogram and the Morlet wavelet transform. As a result, four periods are found at around 1050, 500, 300 and 160 days. We analyze these periods’ temporal variabilities in detail and discuss their respective origins briefly.

关 键 词：SOLAR MAGNETIC FIELDS SOLAR ACTIVITY SOLAR photosphere. 

分 类 号：N[自然科学总论]