Seminar by Camilla Scolini - Research Scientist at the Space Science Center, University of New Hampshire
Title: The Magnetic Complexity and Coherence of Interplanetary Coronal Mass Ejections
Abstract:
Many aspects of the three-dimensional structure and evolution of coronal mass ejections (CMEs) in interplanetary space remain unexplained. A prominent question is whether interplanetary CMEs can behave as magnetically coherent objects, and at which scales such a coherence exists. Recent studies also highlighted the ever-changing nature of the CME magnetic complexity during propagation, primarily as a consequence of interactions with other large-scale solar wind structures. In this presentation, we summarize recent efforts shedding light on the spatial distribution and evolution of CME magnetic complexity and coherence during propagation through the interplanetary space.
First, we will present results from a statistical analysis of complexity changes affecting the magnetic structure of interplanetary CMEs observed by multiple spacecraft in radial alignment at the heliocentric distances of Mercury, Venus, and 1 au. The consideration of a statistical set of CMEs allows us to generalize previous observational results based on CME case studies and to draw, for the first time, conclusions on the frequency, causes, and effects of magnetic complexity changes on CME structures. Complementing these observational results, we will then present numerical analyses, conducted using the EUHFORIA model, on the spatial distribution and evolution of CME complexity and coherence in response to interactions with different solar wind streams. The novelty of our approach lies in the use of a swarm of simulated spacecraft to perform an augmented investigation of complexity and coherence within CMEs from an in situ perspective as consistent as possible to actual multi-spacecraft observational efforts. Such investigations highlight the key role of interactions with other large-scale solar wind structures in shaping the complexity and coherence of CMEs, yielding insights into the evolutionary paths of CMEs during propagation, and aiding in the planning of future dedicated multi-spacecraft missions.
When: Thursday 12 Januari 2023
Where: The seminar can be followed in person in building 200B, room 02.16 or online at the following link:
https://eu.bbcollab.com/guest/6fc7259fc2ba4f29af721ccb6a19eefd
