A discussion of impulses and jerks in the geomagnetic field

Details A discussion of impulses and jerks in the geomagnetic field A discussion of impulses and jerks in the geomagnetic field

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.4403a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, June 10, 1984, p. 4403-4412.

Physics

37

Curve Fitting, Geomagnetism, Magnetic Variations, Secular Variations, Time Series Analysis, Data Smoothing, Dynamo Theory, Earth Core, Mean Square Values, Parabolas

Scientific paper

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.

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