Magnitude of the anomalous geomagnetic fields
The normalized amplitudes of the anomalous geomagnetic field variations (presented by tipper C) with period T>200 s arising around electrical conductivity anomalies have been considered. C>1 means that the secondary (induced) field is greater than the primary (inducing) one. Worldwide...
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| Date: | 2025 |
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| Main Authors: | , |
| Format: | Article |
| Language: | English |
| Published: |
S. Subbotin Institute of Geophysics of the NAS of Ukraine
2025
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| Subjects: | |
| Online Access: | https://journals.uran.ua/geofizicheskiy/article/view/322473 |
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| Journal Title: | Geofizicheskiy Zhurnal |
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Geofizicheskiy Zhurnal| Summary: | The normalized amplitudes of the anomalous geomagnetic field variations (presented by tipper C) with period T>200 s arising around electrical conductivity anomalies have been considered. C>1 means that the secondary (induced) field is greater than the primary (inducing) one. Worldwide, the mean observed tippers are C=0.3 for coastal observatories and C=0.15 for inland ones. The maximum tippers are 1.5 for coastal and C=1.6 for inland observatories. Modeling realistic anomalies with uniform conductivity yields C up to 2.5. The larger C can arise in a non-uniform conductor due to the superchanneling effect.
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