Solar wind and geomagnetism: toward a standard classification of geomagnetic activity from 1868 to 2009

Author(s)
Zerbo, J. L.; Mazaudier, C. Amory; Ouattara, F.; Richardson, John D.
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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.
Date issued
2012-02
URI
http://hdl.handle.net/1721.1/72113
Department
MIT Kavli Institute for Astrophysics and Space Research
Journal
Annales Geophysicae
Publisher
Copernicus GmbH
Citation
Zerbo, J. L. et al. “Solar Wind and Geomagnetism: Toward a Standard Classification of Geomagnetic Activity from 1868 to 2009.” Annales Geophysicae 30.2 (2012): 421–426.
Version: Final published version
ISSN
0992-7689
1432-0576
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