Space weather is about connecting the Sun to the Earth, and being able to anticipate the most extreme solar events and their impact on our technology and health. It becomes even more challenging during periods of maximum solar activity, which happen every 11 years due to the solar dynamo, and which is currently happening right now (maximum peak estimated in 2025). Luckily, the current conjecture of space observatories dedicated to the Sun-Earth chain is very complimentary, with new missions like Solar Orbiter providing unique and useful insight.

I will present here some of my contributions to space weather research at DAp, focusing especially on the impact of solar activity and how Solar Orbiter data can help with this challenging regime. I will first explain how far-side and out of the ecliptic data gaps filled with Solar Orbiter will influence solar wind simulations. Then, I will show how the modulation of solar activity in the heliosphere will influence the propagation of transients such as CMEs (Coronal Mass Ejections) or cosmic rays. Finally, I will extend my research to the subject of exo-space weather, and discuss how the dynamo-wind coupling may influence other stars and their environment.

Organisateur : Frédéric GALLIANO