Evidence for a geomagnetic jerk in 1990 across Europe
Evidence for a geomagnetic jerk in 1990 across Europe
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1990 年欧洲地磁急变的证据
DOI：
10.4401/ag-4106
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发表时间：
1995
影响因子：
1
通讯作者：
A. Meloni
中科院分区：
文献类型：
--
作者：
L. Cafarella;A. Meloni
对地磁观测站的地磁数据的分析表明，在长期变化中存在着非常迅速的变化或急动，特别是1969年和1978年发生的众所周知的地磁急动。1990年前后似乎出现了一个新的地磁急动，在欧洲一些地磁台上可以清楚地看到，它是长期变化模式的一种快速而突然的变化。在高纬度和中纬度两个不同的天文台，全天和平静日的平均值之间的比较表明，这种现象，正如许多作者对其他急动所述，可能是由内部来源产生的。
The analysis of geomagnetic data from magnetic observatories demonstrated the existence of very rapid changes, or jerks, in the secular variation, especially the occurrence of the well known geomagnetic jerks of 1969 and 1978. A new geomagnetic jerk seems to have appeared around 1990 and is clearly visible at a selec- tion of European magnetic observatories as a rapid and sudden change in the secular variation pattern. The comparison between all day and quiet day means for two different observatories, respectively at high and middle latitude, suggests that this phenomenon, as stated by many authors for the other jerks, could be generated by an internal source.