摘要
提出一种构造磁效应中源自SQ地方时变化的新的背景噪声概念,并给出其理论计算方法.对其量级以及在地磁同步差值总体噪声中的贡献进行了实例分析.结果表明,该噪声在差值偶经度差<40°的范围内随间距线性增大,其变化率在40°N上约为0.4NT/(°).基于一对经度差为0.357°差值偶的实例分析表明,在地磁静日该噪声约占差值总体噪声的1/5.
A new concept is suggested on tectonomagnetic research about the noise in simultaneous geomagnetic difference data caused by the effect of Sq local-time variation, together with the method of theoretical calculation. The level of the noise and its contribution to the total noises of the differences data are analyzed. The result indicates that the noise increases linearly with distance between two stations in the range of 40° longitudedifference, and its increasing rate is about 0.4 nT/（°） at 40°N latitude. The example calculated at a pair of sites with longitude-difference 0. 357°, shows that the noise is about one fifth of the total noises of the difference data on geomagnetic quiet-days.
出处
《地震学报》
CSCD
北大核心
2006年第1期85-90,共6页
Acta Seismologica Sinica
基金
地震科学联合基金(198009)资助
中国地震局地球物理研究所论著06AC1008.
关键词
太阳静日变化Sq
地方时变化
同纬度
同步差值
噪声
solar quiet-day variation Sq
local-time variation
same latitude
simultaneous difference data
noise
