Interdisciplinary research at the intersection of solar and heliospheric physics, magnetospheric science, and planetary studies is essential for a comprehensive understanding of solar activity and its profound effects throughout the solar system. By integrating observations and models from multiple disciplines, this session aims to elucidate the mechanisms driving solar-planetary interactions. The session should make visible the European Heliophysics Community, that strongly follows interdisciplinary-oriented research. In that respect, the recent great solar storms provide an ideal “natural approach” for interdisciplinary investigations. This session therefore covers, not exclusively but mainly, the activity period March 2023 until May 2024 in all aspects. On the dynamics of the Sun, including solar flares, coronal mass ejections, and solar wind, and their interactions with the heliosphere and planets, and how solar phenomena influence planetary magnetospheres, ionospheres, and atmospheres. The session also aims to show how interdisciplinary studies foster the communication between different fields of research for designing more efficient data analysis tools serving all.