Intermittency of storms and substorms: is it related to the critical behaviour? P. Dobias1 and J. A. Wanliss2 1DRDC CORA, 101 Colonel By Dr., Ottawa, ON, K1A0K2, Canada 2Presbyterian College, 503 S Broad St, Clinton, SC 29325-2865, USA
Abstract. Intermittency is one of the possible means of quantifying dynamics of
fractal processes. In this paper, the analysis of the intermittency of
magnetospheric storms and substorms is presented. The analysis allows for a
classification of the processes in terms of the power-law scaling of the
magnitude of deviations of the index values from the values at quiet times
(normal state), and the relative timings of occurrences of such deviations.
These are expressed in terms of the co-dimension and the Fano factor. The
relationship between the two is related to the nature of the processes
behind the observed storm and substorm dynamics. The results suggest that
there is a similarity between the two, and therefore it is possible that
there are common dynamical processes behind the storms and substorms. In
particular, it appears that both of them behave consistently with what would
be expected for critical systems, which is consistent with the conclusions
of several previous works.
Citation: Dobias, P. and Wanliss, J. A.: Intermittency of storms and substorms: is it related to the critical behaviour?, Ann. Geophys., 27, 2011-2018, doi:10.5194/angeo-27-2011-2009, 2009.