Interplanetary Coronal Mass Ejections (ICMEs) are the main drivers of large geomagnetic storms. Their influence on space weather is a topic of intense research. In recent years, multispacecraft observations and high performance numerical MHD simulations have contributed largely to this field. The comparisons between models and observations are clarifying several problems, such as the effects of the ambient solar wind on their propagation and internal configuration, the link between ICMEs and non-thermal energetic particles in the heliosphere (solar, interplanetary, and galactic origin), etc. In this session we invite contributions focused on ICME studies, including ICME propagation in the heliosphere, the interaction of ICMEs with Earth and/or with other planets, the link between CMEs and ICMEs, their relation with energetic particles, as well as on other general topics linked with ICMEs.

Solar eruptive events such as coronal mass ejections (CMEs) and flares, and associated shock waves are the most frequent drivers of disturbed space weather conditions. Since, both flares and CMEs emit radio emission, solar radio observations bring an important additional information to studies of eruptive events and correspondingly to space weather studies. Radio observations bring information about the energy release, the configuration of flare-CME source regions including the position of open magnetic field lines and their connectivity to the Earth, about the particle acceleration and transport, and the origin of solar energetic particle (SEP) events. Radio observations are also unique means of tracking CME-driven shock waves all the way from the low corona through the inner heliosphere, and they can provide information on the ambient coronal parameters.

This session aims to promote the importance of radio observations in space weather studies and introduce them to the wider heliospheric/space weather communities. The session is open to all space weather studies that exploit solar radio observations and to all studies of radio observations relevant to space weather.

Simultaneous measurement of ICMEs and SEPs at multiple locations (e.g., the Earth, STEREOs, Moon, Mercury, Mars, Rosetta, Voyager, and so on) has ushered in an era where it is possible to study space weather events as they propagate and evolve through the heliosphere. Their propagation properties, spatial and temporal evolution and their arrival times at different locations can be derived from these multi-point measurements. Such studies can benefit from various data-based MHD models and transport tools, and in turn increase their value through validation. This session aims to bring together the observation and modelling communities and focus on employing multi-point measurements to study interplanetary solar events and their evolution in the heliosphere

The launch of STEREO, at the end of 2006, heralded the start of a new era in the observation of the solar system. Together with SoHO, located at a fixed position at L1, STEREO has continuously provided multiple views of large-scale phenomena propagating through the inner heliosphere. With this unprecedented combination of remote-sensing and in-situ observations, in particular, we have been able to gain a much deeper understanding of the 3-dimensional nature of large-scale inner heliospheric structures such as coronal mass ejections (CMEs) and stream/corotating interaction regions (SIRs/CIRs). But what have we gleaned about the limitations of single-viewpoint observations? How can we apply that knowledge in a future with, potentially, only single-spacecraft observations? Moreover, what are the implications for the design of future multi-viewpoint missions?

In this session, we invite observational, theoretical, and modeling contributions that address these questions and cover studies on the evolution, propagation and morphology of large-scale structures (CMEs, SIRs & CIRs) from single- or multi-view point observations at any wavelength.