Solar wind and geomagnetism: toward a standard classification of geomagnetic activity from 1868 to 2009
We examined solar activity with a large series of geomagnetic data from 1868 to 2009. We have revisited the geomagnetic activity classification scheme of Legrand and Simon (1989) and improve their scheme by lowering the minimum Aa index value for shock and recurrent activity from 40 to 20 nT. Thi...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2012-02-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/30/421/2012/angeo-30-421-2012.pdf |