Abstract We investigate the maximum expected magnitudes of geomagnetically induced currents (GICs) in Czech transmission power network. compute a model utilising Lehtinen–Pirjola method, considering plane-wave geoelectric field, and using network parameters kindly provided by operator. find that amplitudes nodes grid during Halloween storm-like event are about 15 A. For “extreme-storm” conditio...

The ionospheric effects of six intense geomagnetic storms with Dst index ≤ −100 nT that occurred in 2012 were studied at a low-latitude station, Darwin (Geomagnetic coordinates, 21.96° S, 202.84° E), low-mid-latitude Townsville (28.95° 220.72° and mid-latitude Canberra (45.65° 226.30° the Australian Region, by analyzing storm–time variations critical frequency F2-region (foF2). Out storms, stor...

This paper presents an overview of results obtained during the CAWSES-II period on the short-term variability of the Sun and how it affects the near-Earth space environment. CAWSES-II was planned to examine the behavior of the solar-terrestrial system as the solar activity climbed to its maximum phase in solar cycle 24. After a deep minimum following cycle 23, the Sun climbed to a very weak max...

[1] A computationally optimized low-dimensional nonlinear dynamical model of the magnetosphere-ionosphere system called WINDMI is used to analyze two large geomagnetic storm events, 3–7 October 2000 and 15–24 April 2002. These two important storms share common features such as the passage of magnetic clouds, shock events from coronal mass ejections, triggered substorms, and intervals of sawtoot...

We study the annual frequency of occurrence of intense geomagnetic storms (Dst < )100 nT) throughout the solar activity cycle for the last three cycles and ®nd that it shows di€erent structures. In cycles 20 and 22 it peaks during the ascending phase, near sunspot maximum. During cycle 21, however, there is one peak in the ascending phase and a second, higher, peak in the descending phase separ...