The study of Sq equivalent current during the solar cycle
The study of Sq equivalent current during the solar cycle
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发表时间：
2014
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通讯作者：
Zhao Xu
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作者：
Zhao Xu
Sq电流与太阳活动密切相关，太阳活动直接影响Sq电流。利用中国地震局地磁台网和地磁台网中心1996年至2006年第23个太阳周的地磁资料，分析了外源和内源Sq当量电流的变化。我们采用球谐分析的方法。Sq当量电流的强度与太阳的黑子数有很好的相关性。太阳活动最大时的电流强度大于太阳极小期的电流强度。电流焦点的纬度受太阳活动的影响不大。在太阳活动最大和最小期间，电流强度的季节变化有明显的差异。在太阳活动极大期间，Sq等效电流的强度与太阳的黑子数有很好的相关性。在太阳活动极大期间，Sq等效电流的强度与太阳活动的季节变化有明显的差异。在太阳活动极大期间，Sq等效电流的强度与太阳的黑子数有很好的相关性。电流强度的峰值出现在春分附近，而在太阳极小年，电流强度的峰值出现在至日附近。
The Sq current relates closely to the solar activity,and the solar activities directly affect the Sq current.In this paper,the geomagnetic data from INTERMAGNET and Geomagnetic Network Center of China Earthquake Administration in 23 rd solar cycle(1996—2006)have been used to analyze the variation of external and internal source Sq equivalent current.The method we adopted is the spherical harmonics analysis.The intensity of the Sq equivalent current has a good correlation to the spot number of the sun.The intensity of the current is larger during the solar maximum than that during the solar minimum.The latitude ofthe current focus is not affected significantly by the solar activities.There is an evident difference between the seasonal change of current intensity during the solar maximum and minimum.During the solar maximum,the peak value of current intensity occurs near the equinoxes,while during the solar minimum years,the peak value of current intensity occurs near the solstices.