Journal cover Journal topic
Annales Geophysicae Sun, Earth, planets, and planetary systems An interactive open-access journal of the European Geosciences Union
Ann. Geophys., 30, 421-426, 2012
https://doi.org/10.5194/angeo-30-421-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Regular paper
27 Feb 2012
Solar wind and geomagnetism: toward a standard classification of geomagnetic activity from 1868 to 2009
J. L. Zerbo1,2, C. Amory Mazaudier2, F. Ouattara3, and J. D. Richardson4 1Université Polytechnique de Bobo Dioulasso, 01 BP 1091 Bobo-Dioulasso 01, Burkina Faso
2LPP-Laboratoire de Physique des Plasmas/UPMC/Polytechnique/CNRS, UMR 7648, 4 Avenue de Neptune, 94107 Saint-Maur-des-Fossés, France
3Ecole Normale Supérieure de l'Université de Koudougou, BP 376 Koudougou, Burkina Faso
4Center for Space Research, M.I.T., Cambridge, USA
Abstract. 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. This improved scheme allows us to clearly classify about 80% of the geomagnetic activity in this time period instead of only 60% for the previous Legrand and Simon classification.

Citation: Zerbo, J. L., Amory Mazaudier, C., Ouattara, F., and Richardson, J. D.: Solar wind and geomagnetism: toward a standard classification of geomagnetic activity from 1868 to 2009, Ann. Geophys., 30, 421-426, https://doi.org/10.5194/angeo-30-421-2012, 2012.
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