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http://hdl.handle.net/2122/3920| Authors: | Meloni, A.* De Michelis, P.* Cafarella, L.* |
Editors: | Boschi, E. Ekström, G. Morelli, A. |
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 Classification: | 04. 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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