ИСТИНА

Regular solar observations in EUV range provide a detailed and timely data about the structures and active processes, which can form the potentially geoeffective solar wind streams, such as HSS (high-speed stream) and ICME (interplanetary coronal mass ejection). We consider solar origins and formation of solar wind streams, their ion composition, streams interaction in the corona and interplanetary space and its influence on the solar wind parameters in-situ. For the period January 2010 – August 2011, we identified solar sources of the ICMEs as the Earth-directed coronal mass ejections (CMEs) from coronagraph observations (STEREO-A, -B and LASCO). It was found, that in 11 cases out of 23 the observed might be associated with two or more CME sources. As a reliable marker for identification of interacting streams and their sources, we used the plasma ion composition, as it becomes frozen in the low corona and remains unchanged in the heliosphere. We described in-situ temporal profiles of the ion composition for the single-source and multi-source solar wind structures and compared them with the ICME signatures determined from the kinematic and magnetic field parameters of the solar wind. In the cases of multiple-source events, the resulting solar wind disturbances look as complex structures occurred due to the stream interactions with properties depending on the type of participating streams. The obtained results will be used for improving the model for prediction of solar wind streams based on observations of their solar origins.