Articles | Volume 19, issue 9
https://doi.org/10.5194/angeo-19-1107-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/angeo-19-1107-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
30 Sep 2001
Time derivative of the horizontal geomagnetic field as an activity indicator
A. Viljanen
Finnish Meteorological Institute, Geophysical Research Division, P.O. Box 503, FIN-00101 Helsinki, Finland
H. Nevanlinna
Finnish Meteorological Institute, Geophysical Research Division, P.O. Box 503, FIN-00101 Helsinki, Finland
K. Pajunpää
Finnish Meteorological Institute, Geophysical Research Division, P.O. Box 503, FIN-00101 Helsinki, Finland
A. Pulkkinen
Finnish Meteorological Institute, Geophysical Research Division, P.O. Box 503, FIN-00101 Helsinki, Finland
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