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Internal origin time variations


The geomagnetic field is characterized by temporal variations that take place on different time scales. In fact these variations can have different origins and are divided into two main classes: long-term and short-term variations. Long-term variations, known as secular variation, are associated to sources (the same producing the main field) in the deep interior of the Earth and generally occur on time scales larger than few years. On the contrary, short-term variations are originated in the space external to the Earth and are characterised by time scales less than one year.


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