GEOMAGNETIC CONSEQUENCES OF THE SOLAR FLARES DURING THE LAST HALE SOLAR CYCLE (Ⅱ)

摘要

The effects of the solar energetic phenomena cover the entire terrestrial environment, from the outer atmospheric layer to the ground. The energy source of all these geomagnetic disturbances is the solar plasma that may originate from solar eruptive phenomena that take their energy from magnetic field of the Sun. This paper is part of a larger study concerning the geomagnetic effects produced by solar phenomena. We analyze the cyclic variability of solar flares (registered in H_α and X-ray) and compare it with the variations of some geomagnetic indices (aa index and the number of sudden storm commencements (SSCs)) for the last Hale cycle. The solar cycles 22 and 23 are different in the level of flare activity and in the slope and the duration of their ascending branch.