Speaker
Description
First Name: Emilia
Last Name: Kilpua
Email Address: emilia.kilpua@helsinki.fi
Affiliation: University of Helsinki
All Authors: Emilia Kilpua
Abstract: Large-scale solar wind transients are fundamental drivers of heliospheric variability and space weather at Earth and other solar system planets. The most important of these are interplanetary coronal mass ejections (ICMEs), consisting of shocks, sheath regions, and driving ejecta, often featuring magnetic cloud signatures. This talk focuses on key properties of ICMEs and outlines differences between their various substructures. The emphasis will be on complexities and incoherence ICMEs manifest in the heliosphere, such as deviations from a coherent flux-rope structure and the presence of mesoscale features, in light of recent multi-spacecraft observations. The talk will also discuss the origins of deviations from the idealized flux-rope picture, arising partly from the Sun’s dynamo-driven magnetic field and partly from interplanetary evolution.