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《Chinese Journal of Geophysics》 2005-01
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The geomagnetic dipole field in the 20th century

WANG Tan-Wen Institute of Geophysics, China Earthquake Administration, Beijing 100081, China Lab. of Space Weather, Chinese Academy of Sciences, Beijing 100080, China  
The study of the variations of the geomagnetic field in the 20th century becomes possible because the IGRF (International Geomagnetic Reference Field) data in 1900~2000 are available. During the 20th century, even after 19th century, the magnetic dipole moments have changed much. And the all three components of the Earth's center dipole decreased much in the last century. The variation of the positions of the geomagnetic south pole in about 1930 turned over, and it began to drift westward and southward after 1960 The direction of the axis of the dipole only changed by about 1° in latitude and by about 3° in longitude in 20 th century. That is far away from the reverse of the geomagnetic poles.
【Fund】: 国家自然科学基金重点项目 (4 0 43 60 16)资助
【CateGory Index】: P318
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