A discussion of impulses and jerks in the geomagnetic field
A discussion of impulses and jerks in the geomagnetic field
复制标题
地磁场中脉冲和冲击的讨论
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
L. Alldredge
中科院分区：
文献类型：
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作者：
L. Alldredge
法国和英国的工作人员发表了报告，描述了发生在1969年的长期加速度的突然变化，称为冲动或颠簸。他们声称，这种变化发生在一两年的时间里，所谓的混蛋的来源是内部的。本文质疑他们的分析方法，指出他们的方法的逐段拟合的抛物线的数据将总是创建一个不连续的长期加速度的抛物线加入和地方的抛物线加入是一个先验的假设，而不是分析的结果。它还表明，加加速度定义为一个近似的三阶时间导数主要是外部起源。一个简短的审查使用的术语冲动和抽搐是在介绍。
French and United Kingdom workers have published reports describing a sudden change in the secular acceleration, called an impulse or a jerk, which took place in 1969. They claim that this change took place in a period of a year or two and that the sources for the alleged jerk are internal. This paper questions their method of analysis, pointing out that their method of piecemeal fitting of parabolas to the data will always create a discontinuity in the secular acceleration where the parabolas join and that the place where the parabolas join is an a priori assumption and not a result of the analysis. It is also shown that the jerk defined as an approximation to the third time derivative is mostly of external origin. A short review of the uses of the terms impulses and jerks is given in the introduction.