Worldwide character of the 1991 geomagnetic jerk

Worldwide character of the 1991 geomagnetic jerk
复制标题

1991 年地磁急变的全球特征

DOI：
--
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
A. Meloni
A. Meloni
中科院分区：
--
文献类型：
--
作者：
P. de Michelis;L. Cafarella;A. Meloni

文献摘要

被引文献

相似文献

最近对欧洲地磁观测站的地磁元素年平均值的检查表明，在大约1991年的长期加速度中存在突变。本文研究了1991年冲量的时空特征，证明了它的世界性特征，并对Y分量的幅度空间分布进行了估计，分析了74个地磁观测站的资料。从年平均数据中剔除外部影响，从修正后的年平均中依次估计出Y长期变化。此外，还将二阶导数阶跃强度的世界性特征与之前著名的1969和1978年挺举事件的特征进行了比较。
A recent examination of the geomagnetic element annual mean values for the European magnetic observatories, has shown the existence of a sudden change in the secular acceleration at about 1991. In this work the space time character of the 1991 impulse is investigated and its worldwide character is evidenced; an evaluation of the amplitude spatial distribution is given for the Y component, analysing data relative to 74 magnetic observatories. The external effects were removed from the annual mean data and successively the Y secular variation has been evaluated from the corrected annual means. Moreover the worldwide character of the intensity of the step in the second time derivative is compared with the character of the previous well known jerk events of 1969 and 1978.