Topical Issue in Solar Physics: Flux-rope Structure of Coronal Mass Ejections Preface
N. Gopalswamy, T. Nieves-Chinchilla, M. Hidalgo, J. Zhang, P. Riley,, and L. van Driel- Gesztelyi, C.H. Mandrini

TL;DR
This collection of papers investigates the flux-rope structure of coronal mass ejections (CMEs), aiming to determine whether all CMEs possess this structure through collaborative data analysis workshops.
Contribution
The issue compiles comprehensive analyses from CDAWs to assess the prevalence of flux-rope structures in CMEs, advancing understanding of their magnetic configurations.
Findings
Evidence suggests many CMEs have flux-rope structures
Not all CMEs necessarily exhibit flux-rope features
The workshops provided a collaborative framework for CME analysis
Abstract
This Topical Issue of Solar Physics, devoted to the study of flux-rope structure in coronal mass ejections (CMEs), is based on two Coordinated Data Analysis Workshops (CDAWs) held in 2010 (20 - 23 September in Dan Diego, California, USA) and 2011 (September 5-9 in Alcala, Spain). The primary purpose of the CDAWs was to address the question: Do all CMEs have flux rope structure? There are 18 papers om this topical issue, including this preface.
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