Space Weather Effects on Technological Systems at the Northern Areas

摘要

Variations of solar wind parameters change electromagnetic fields at the ground level. Geomagnetic storm is a typical example of geomagnetic disturbance. Slow varying electric field during magnetic storm leads to exiting of geomagnetically induced currents (GIC) in any earthing conducting system, such as power lines, signal cables, buried pipelines and so on. During global magnetic storms a disturbance covers the whole planet, magnetic field variations and induced electric fields can develop throughout both hemispheres practically simultaneously. Besides global storms, magnetospheric substorms (though smaller in scale and intensity) are also significant for development of GIC. The generated currents reach their highest values in the auroral and subauroral regions, under strong storm-related ionospheric currents or jets. Time variations of jets are the physical GIC source. In the report possible effects of GIC on technological systems are discussed.