On the characteristics of successive geomagnetic jerks
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概要
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Spherical harmonic models of the 1969, 1979 and 1992 geomagnetic jerks are computed using data from about 160 worldwide geomagnetic observatories. The dominance of the internal origin part with respect to the external one confirms again the internal origin of these events. A change of sign is observed between two successive jerks (1969-1979, 1979-1992). The acceleration jump of the fluid flow at the core mantle boundary (CMB) generating the three jerks is computed. Striking similarities between the three acceleration maps are observed (within the sign change mentioned above). These results suggest some long time scale memory in the processes that are responsible for the jerks. These processes remain to be elucidated.
- 公益社団法人 日本地震学会、地球電磁気・地球惑星圏学会 、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会の論文
著者
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Mouel Jean-louis
Institut De Physique Du Globe De Paris
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HUY Minh
Institut de Physique du Globe de Paris
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ALEXANDRESCU Mioara
Institut de Physique du Globe de Paris
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HULOT Gauthier
Institut de Physique du Globe de Paris
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