A study of non-extensivity in the Earth's magnetosphere
Institute for Space Applications and Remote Sensing, National Observatory of Athens, Metaxa and Vas. Pavlou St., Penteli, 15236 Athens, Greece
2 Section of Solid State Physics, Department of Physics, University of Athens, Panepistimiopolis, Zografos, 15784 Athens, Greece
Corresponding author: email@example.com
Magnetic storms are undoubtedly among the most important phenomena in space physics and also a central subject of space weather. The non-extensive Tsallis entropy has been recently introduced, as an effective complexity measure for the analysis of the geomagnetic activity Dst index. Tsallis entropy has been shown to sensitively detect the complexity dissimilarity between pre-storm activity and intense magnetic storms in the Earth's magnetosphere. Here, we show that the Dst time series obey a modified form of the Gutenberg-Richter law for the case of non-extensive statistics, thus providing evidence for universality in magnetic storm and earthquake occurrence.
© EDP Sciences, Springer-Verlag, 2009