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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 30, issue 2
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.
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

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 J. L. Zerbo et al.
  • 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.

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