摘要: Since Birkeland's observations of high-latitude magnetic perturbations led him to postulate the existence geomagnetically aligned electric currents, theoretical studies have a general understanding mechanisms that are capable driving such and processes associated with formation control current configurations. Recent advances in experimental techniques yielded information on spatial temporal behavior field-aligned Birkeland currents established their association an individual auroral arc energetic precipitating particles. This paper gives brief summary ionospheric effects related production, maintenance, systems. Available data discussed relation some these, effects.