Articles | Volume 19, issue 9
https://doi.org/10.5194/angeo-19-1107-2001
https://doi.org/10.5194/angeo-19-1107-2001
30 Sep 2001
 | 30 Sep 2001

Time derivative of the horizontal geomagnetic field as an activity indicator

A. Viljanen, H. Nevanlinna, K. Pajunpää, and A. Pulkkinen

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