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Authors: Meloni, A.* 
De Michelis, P.* 
Cafarella, L.* 
Title: Geomagnetic jerks: impulses of secular variation in geophysics
Issue Date: Dec-2000
ISBN: 88-7794-255-X
Keywords: Geomagnetic observatories
Geomagnetic jerks
Secular variation
Subject Classification04. Solid Earth::04.05. Geomagnetism::04.05.99. General or miscellaneous 
Abstract: Geomagnetic records from some observatories give a strong indication that there was a rapid, impulsive change in geomagnetic secular acceleration around 1990. Using data coming from about 80 observatories widely distributed all over the world, the structure of the secular variation for the X, Y and Z magnetic field intensities around 1990 was investigated. Evidence of a new recent jerk in 1991 was found. The 1991 geomagnetic jerk features (worldwide character of the Y second time derivative jump intensity and of the occurrence time) are compared with the character of the previous well known jerk events of 1969 and 1978.
Appears in Collections:Book chapters

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