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|Authors: ||Meloni, A.*|
De Michelis, P.*
|Editors: ||Boschi, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione AC, Roma, Italia|
Ekström, G.; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, U.S.A.
Morelli, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia
|Title: ||Geomagnetic jerks: impulses of secular variation in geophysics|
|Issue Date: ||Dec-2000|
|Keywords: ||Geomagnetic observatories|
|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:||04.05.99. General or miscellaneous|
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