![]() ![]() The intensity of GIC has been noted as large as over 100 A, though a few amperes is sufficient to unexpectedly collapse any electrical infrastructure causing a huge loss of money and related hazards (Kappenman et al., 1997). This current is known as geomagnetically induced current (GIC). This induced electric field then drives a current through any electrical network by forming a potential difference between the ground points of that network. In the time of severe geomagnetic storm, solar wind injects a large amount of ionized particles into the Earth's magnetosphere, rapidly changing the intensity of the magnetic field which in turn induces an electric field on the surface of the Earth. A detailed knowledge of the energy coupling mechanism is important to estimate the total amount of injected solar wind energy in the geospace as this energy drives all the geomagnetic fluctuations in the terrestrial magnetosphere, causing intense geomagnetic storm or auroral activities (Russell, 2000, 2013).Įxtreme geomagnetic activity is considered to be a serious threat to the Earth's technological and electrical systems. The direction and magnitude of IMF B Z is the primary controller of the solar wind-magnetosphere reconnection along with the dynamic pressure of the solar wind. These huge amounts of particles are injected into the Earth's magnetosphere through the cusps controlled by the zth component of the interplanetary magnetic field (IMF), B Z. The solar wind, a stream of highly energized plasma particles, emitted from the Sun's outer atmosphere, is coming toward the Earth with an average speed of 400 km/s. The solar wind-magnetosphere interaction and the energy coupling can be considered as the key factor to understand the various dynamical properties of the terrestrial magnetosphere. #Omniweb nasa dst index seriesFor each year, the two resultant output time series of the model display high-correlation coefficients with the real-time Dst and AE indexes, respectively, which denotes the acceptability of the proposed energy coupling function and its relation with the solar activities. The threshold value B Th plays a significant role in the analysis and exhibits a proportional relationship with the yearly mean total number of sunspots for each year of the range 1997–2007 of the 23rd solar cycle. For our study, the range of years 1997–2007 of the 23rd solar cycle had been considered here. The model generates two output series, which are the numerical representation of the real-time Dst index and AE index series, respectively. The function determines the cusp width W depending on the intensity of (− B Z − B Th) where B Th is the threshold value. In this paper, we analyzed the perturbed magnetosphere as a sandpile-like cellular automata model based on the concept of self-organized criticality and many-body interactive system and proposed a solar wind-magnetosphere energy coupling function in terms of interplanetary magnetic field B Z, the zth component of interplanetary magnetic field. Solar wind-magnetosphere interaction and the injection of large quantity of plasma particles into the Earth's magnetosphere are the primary reasons behind geomagnetic storm, auroral effects, and, in general, all the fluctuations observed in the terrestrial magnetic field. ![]()
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