Statistics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996angeo..14..286t&link_type=abstract
Annales Geophysicae, vol. 14, Issue 3, pp.286-289
Statistics
6
Scientific paper
Seasonal variations in the onset of magnetic storms are investigated. For the purposes of this study storms have been defined as events in which Dst falls below -50 nT for at least four consecutive hours. The storms have been classified as either storm sudden commencements (SSCs; storms initiated by a sudden commencement) or as storm gradual commencements (SGCs; all other storms). It is found that the semi-annual variation of magnetic activity is reflected in the occurrence statistics of SGC events only, indicative that the solar wind origin is different for SSCs and SGCs. It is suggested that the heliospheric latitude model of seasonal magnetic activity is relatively ineffective in modulating the previously observed seasonal variations in the occurrence of magnetic storms. Acknowledgements. The research described in this publication was made possible in part by Grant JDG100 from the International Science Foundation and Russia Government. I would like to thank Dr. P. G. Richards and an anonymous referee for critical reading of the manuscript as reviewers and for helpful comments. Topical Editor, J.-C. Geŕard thanks P. G. Richards and J. Kozyra for their help in evaluating this paper.-->
Lester Mark
Taylor John R.
Yeoman Timothy K.
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