Description of the helio-geophysical conditions during the magnetically disturbed period of june 21–26, 2015

Abstract

Extreme solar events, such as flares accompanied by coronal mass ejections (CMEs), perturb the Earth’s magnetic field and generate fluctuating currents in the ionosphere and magnetosphere. In this study, we describe the heliogeophysical conditions during the magnetically disturbed period of 21–26 June 2015 on the basis of satellite and ground-based observations. Variations in the solar wind, interplanetary magnetic and electric fields, the planetary Kp index, and geomagnetic field components measured at a mid-latitude observatory are analysed. The storm of 22–24 June 2015 represents one of the strongest geomagnetic disturbances of Solar Cycle 24 and provides an important example of a geoeffective CME.