ИСТИНА

Identification of solar sources of the interplanetary coronal mass ejections (ICMEs) for the growing phase of cycle 24 (2010–2012) based on the Richardson and Cane ICME list has shown that in ~30 % cases the observed ICME may be associated with two or more CMEs. Such CMEs propagating to the Earth can interact in the corona or in the heliosphere. In some other cases, CMEs can propagate along and interact with high speed streams (HSSs) of solar wind from coronal holes. As a result, this interaction can lead to specific changes in the parameters of the associated ICMEs at 1 AU, such as velocity, magnetic field and ion composition. In the report, we consider the forming of the ion charge state of the ICME plasma for a typical CME and the scenarios how interaction of a CME with other solar wind streams (CME, HSS) can influence on the ICME parameters observed at 1 AU. We demonstrate these effects on a number of cases of cycle 24.