Phase and amplitude asymmetry in the quasi-biennial oscillation of solar Hα flare activity
Phase and amplitude asymmetry in the quasi-biennial oscillation of solar Hα flare activity
复制标题
太阳H α耀斑活动准两年一次振荡中的相位和幅度不对称
DOI：
10.1093/mnras/stz1653
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发表时间：
2019-09-01
影响因子：
4.8
通讯作者：
Wang, F.
中科院分区：
文献类型：
--
作者：
Deng, L. H.;Zhang, X. J.;Wang, F.
太阳磁活动准两年振荡（QBO）是发电机机制的内在特征，但目前对QBO的认识还很不够。本文利用集合经验模态分解、互相关分析和小波变换技术，研究了北方和南方半球H α耀斑QBO的相位和振幅不对称性。结果表明：（1）太阳H α耀斑指数QBO在两半球具有复杂的位相关系，但没有表现出系统的规律性;（2）1966 ~ 2014年期间，北方半球H α耀斑指数的太阳周期模式普遍领先南半球9个月。这些结果的可能来源进行了讨论。
Quasi-biennial oscillation ( QBO) of solar magnetic activities is intrinsic to dynamo mechanism, but still far from fully understood. In this work, the phase and amplitude asymmetry of solar QBO of H alpha flare activity in the northern and southern hemispheres is studied by the ensemble empirical mode decomposition, the cross-correlation analysis, and the wavelet transform technique. The following results are found: ( 1) solar QBO of H alpha flare index in the two hemispheres has a complicated phase relationship, but does not show any systematic regularity; and ( 2) the solar cycle mode of solar H alpha flare index in the northern hemisphere generally leads that in the southern one by nine months for the time interval from 1966 to 2014. The possible origin of these results is discussed.