Intermittency and multifractional Brownian character of geomagnetic time series

被引:18
作者
Consolini, G. [1 ]
De Marco, R. [1 ]
De Michelis, P. [2 ]
机构
[1] INAF Ist Astrofis & Planetol Spaziali, I-00133 Rome, Italy
[2] Ist Nazl Geofis & Vulcanol, I-00143 Rome, Italy
关键词
SELF-ORGANIZED CRITICALITY; AURORAL ELECTROJET INDEX; AE-INDEX; MAGNETIC STORMS; DYNAMICS; MAGNETOSPHERE; FLUCTUATIONS; MAGNETOTAIL; TRANSITION; TURBULENCE;
D O I
10.5194/npg-20-455-2013
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The 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.
引用
收藏
页码:455 / 466
页数:12
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