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A. Pulkkinen R. Kataoka S. Watari M. Ichiki 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2010
In this paper a model for computing geomagnetically induced currents (GIC) from local geomagnetic field observations carried out in Hokkaido, Japan is constructed. The model is composed of system parameters mapping the horizontal geoelectric field to GIC and of 1D conductivity model. A rigorous model validation is used to show that the model reproduces the observed GIC with a very good accuracy. 相似文献
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Buzulukova N. Yu. Kovrazhkin R. A. Glazunov A. L. Sauvaud J.-A. Ganushkina N. Yu. Pulkkinen T. I. 《Cosmic Research》2003,41(1):3-12
Nose structures are objects formed by H+ particles penetrating into the inner magnetosphere [1, 2]. We present the results of experimental studies and numerical modeling of the nose structures. Statistical processing of the observations of nose structures in 1997 by the ION instrument onboard the Interball-2 satellite at heights of 10000–15000 km demonstrates that the probability of formation of the nose structures under quiet magnetic conditions (with current values K
p = 0–1) in the nighttime sector of the magnetosphere is 90%. The probability of observation of the nose structures in the daytime sector equals 50% at the current value K
p = 0–1, and the correlation between the observations of nose structures and K
p can be improved (up to 75%) if the K
p index is taken 6 h before the observed events. It is shown that nose structures are a characteristic feature not only of the substorm processes but also of quasi-stationary phenomena in the quiet magnetosphere. The nose structures observed in magnetically quiet periods are called stationary nose structures in this work. By modeling drift trajectories for protons, it is shown that the stationary nose structures are formed in all sectors of the MLT. The stationary nose structures observed by the ION instrument are modeled in the night, morning, and daytime sectors of the MLT. The relation between the stationary nose structures and ion spectral gaps is considered. 相似文献
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