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《Chinese Journal of Geophysics》 1994-04
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LONGITUDINAL EFFECTS AND UT VARIATIONS OF THE Sq EXTERNAL AND INTERNAL CURRENT SYSTEMS

XU WRN一YAO;LI WEI DONG(Institute of Geophysics,Academia Sinica,Beijing 100101)  
The Sq external and internal current systems have been calculated for each UT hour on the basis of the magnetic data from the world station network and China stations during IGY/IGC. The longitudinal effects and UT variations of the current systems have been analysed.For the external current System,there is no significant UT-variation in the pattern;the geographic latitudes of the current vortex foci are correlated with the magnetic equator with a variation range of 25° 35°N for Nhemisphere and 30° 42.5°S for S-hemisphere;the total intensity of the externalcurrent is 229kA for N-hemisphere and 173kA for S-hemisphere. For the internal current system the pattern and intensity have remarkable UT-variations;the focus latitude variation is similar to the external currents.In Atlantic,Indian Ocean,North Pacific Ocean,the intensities of the internal currents are smaller than those in continental regions,implying lower conductivities of the upper mantle in ocean regionsthan those in continents.
【Fund】: 国家自然科学基金
【CateGory Index】: P318.6
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【References】
Chinese Journal Full-text Database 2 Hits
1 Li Qi and Gao Mengtan (Institute of Geophysics, China Earthquake Administration, Beijing 100081 ,China);Elementary research of recent development about geomagnetism[J];地震地磁观测与研究;2004-04
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【Co-references】
Chinese Journal Full-text Database 9 Hits
1 ZHU Ri-xiang, HUANG Bao-chun, PAN Yong-xin, DENG Cheng-long(Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 10029, China);A brief guide to the laboratory of bock magnetism and paleomagnetism at the institute of geology and geophysics, Chinese academy of sciences[J];地球物理学进展;2003-02
2 XU Zhaoyong, YANG Run-hai, HU Yi-li, XU Jun, WANG Yun-yun (1. Institute for Disaster Prevention of Yunnan Province, Kunming 650041; 2, Department of Geoscience of Yunnan University* Kunming; 3. Kunming Nanfang Technique Company of Rock and Soil);A study of mechanism for slow earthquakes and precursors[J];地震;2003-02
3 LI Wu-xian, JIN Ming-pei, MA Jun-Kang (Seismological Bureau of Dali City, Dali 671000, Yunnan Province, China;Western Yunnan Earthquake Prediction Test Site, CSB, Dali 671000, Yunnan Province, China);Electromagnetic wave anomaly characteristics before strong earthquakes and its prediction significance in Yunnan area[J];地震;2003-02
4 GUAN Hua-ping, HAN Feng-yin, XIAO Wu-jun, CHEN Zhi-yong (Center for Analysis and Prediction, CSB, Beijing 100036;Seismological Bureau of Langfang City, Hebei Province, Langfang 065000, China);ULF electromagnetic radiation observation and data process methods[J];地震;2003-02
5 Hao Jinqi Qian Shuqing Gao Jintian Zhou Jianguo Zhu Tao (Institute of Geophysics & Laboratory of Tectonophysics, China Seismological Bureau, Beijing 100081, China);ULF ELECTRIC AND MAGNETIC ANOMALIES ACCOMPANYING THE CRACKING OF ROCK SAMPLE[J];地震学报;2003-01
6 Gong Shaojing Tian Zhenli Qi Chengzhu He Shumin Yan Xiaomei Chen Huaran Li Liandi (Seismological Bureau of Tianjin, Tianjin 300201, China);SHORT TERM PRECURSOR OF THE GEOMAGNETIC HORIZONTAL FIELD TRANSFER FUNCTIONS[J];地震学报;2001-03
7 ZHU RI XIANG\ LIU QING SONG\ GUO BIN (Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100101,China);PRELIMINARY STUDY ON THE MECHANISM OF THE GEOMAGNETIC SECULAR VARIATIONS IN BEIJING OVER THE LAST 12000 YEARS[J];地球物理学报;2001-02
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【Secondary References】
Chinese Journal Full-text Database 1 Hits
1 Li Qi and Gao Yufen Institude of Geophysics, China Earthquake Administration , Beijing 100081, China;On the October/November 2003 giant storms[J];地震地磁观测与研究;2006-02
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