| Autor: |
Mioara Mandea, F. Anad, Jean-Louis Le Mouël, E. Bellanger |
| Jazyk: |
angličtina |
| Předmět: |
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| Zdroj: |
Earth, Planets and Space. 55(4):173-181 |
| ISSN: |
1880-5981 |
| DOI: |
10.1186/bf03351746 |
| Popis: |
The Intermagnet program publishes each year a cd-rom containing homogeneous series from a number of magnetic observatories (76 in 1999). These series are definitive one-minute values of the three components of the geomagnetic field. We transform these series using a simple nonlinear analysis tool able to characterize the activity of a signal, and we obtain a remarkably simple activity field, whose space and time variables separate over a large part of the Earth. The time function is almost identical for all observatories, and might be interpreted as an activity index. The—almost stationary—field geometry exhibits a dipole-like structure everywhere except in high latitudes. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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