Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/8893
AuthorsConsolini, G.* 
De Marco, R.* 
De Michelis, P.* 
TitleIntermittency and multifractional Brownian character of geomagnetic time series
Issue DateJul-2013
Series/Report no./ 20 (2013)
DOI10.5194/npg-20-455-2013
URIhttp://hdl.handle.net/2122/8893
KeywordsSolar terrestrial interaction
geomagnetic time series
multifractional nature
Subject Classification01. Atmosphere::01.03. Magnetosphere::01.03.03. Magnetospheric physics 
05. General::05.07. Space and Planetary sciences::05.07.01. Solar-terrestrial interaction 
AbstractThe Earth's magnetosphere exhibits a complex behavior in response to the solar wind conditions. This behavior, which is described in terms of mutifractional Brownian motions, could be the consequence of the occurrence of dynamical phase transitions. On the other hand, it has been shown that the dynamics of the geomagnetic signals is also characterized by intermittency at the smallest temporal scales. Here, we focus on the existence of a possible relationship in the geomagnetic time series between the multifractional Brownian motion character and the occurrence of intermittency. In detail, we investigate the multifractional nature of two long time series of the horizontal intensity of the Earth's magnetic field as measured at L'Aquila Geomagnetic Observatory during two years (2001 and 2008), which correspond to different conditions of solar activity. We propose a possible double origin of the intermittent character of the small-scale magnetic field fluctuations, which is related to both the multifractional nature of the geomagnetic field and the intermittent character of the disturbance level. Our results suggest a more complex nature of the geomagnetic response to solar wind changes than previously thought.
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