Abstract
The phase relation of flare index in the northern and southern hemispheres in the time interval of January 1966 to December 2008 is investigated. It is found that, (1) the flare index in the northern hemisphere begin six months earlier than that in the southern one, which should lead to phase asynchrony between them but with a slight effect; (2) the main periods of the flare activity in the two hemispheres slightly differ from each other, which should also lead to phase asynchrony between them; (3) the low-frequency modes of the flare activity can be used to study the varying relationship of long-term solar activities and the high-frequency modes can be considered as the stochastic component that is amplitude modulated.
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Acknowledgements
The authors thank the anonymous referee for her/his careful reading of the manuscript and constructive comments that improved the original version. Flare index data used in this paper were calculated by T. Atac and A. Ozguc from Bogazici University, Kandilli Observatory, Istanbul, Turkey. The authors would like to express their deep thanks to the staffs of all the web sites that provide the data and codes for the public to download. This work is supported by the National Natural Science Foundation of China (NSFC) under grant number 11003041, 11078005 and 40636031, the National Basic Research Program of China 973 under grant number G2011CB811400, Shandong Provincial Natural Science Foundation of China (ZR2009AM021, ZR2012AQ029), Dezhou University Foundation (402126), and the Chinese Academy of Sciences.
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Deng, L.H., Gai, N., Tang, Y.K. et al. Phase asynchrony of hemispheric flare activity revisited: empirical mode decomposition and wavelet transform analyses. Astrophys Space Sci 343, 27–32 (2013). https://doi.org/10.1007/s10509-012-1231-2
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DOI: https://doi.org/10.1007/s10509-012-1231-2