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Statistical study of CMEs, lateral overexpansion and SEP events

Alexandros Adamis - Skoltech; Astrid Veronig - University of Graz, Austria; Tatiana Podladchikova - Skoltech, Russia; Karin Dissauer - NorthWest Research Associates, United States; Rositsa Miteva - Institute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences, Bulgaria; Jingnan Guo - University of Science and Technology of China, China; Mateja Dumbović - University of Zagreb, Faculty of Geodesy, Hvar Observatory, Croatia; Manuela Temmer - University of Graz, Austria; Kamen Kozarev - Institute of Astronomy, Bulgarian Academy of Sciences, Bulgaria; Jasmina Magdalenic - SIDC, Royal Observatory of Belgium, Brussels, Belgium; Veronika Haberle - University of Graz, Austria;  - NASA, United States

Session: Interplanetary CMEs and Solar Particle Events


Abstract

We present a statistical study on the early evolution of coronal mass ejections (CMEs), to better understand the effect of CME (over)-expansion and how it relates to the production of Solar Energetic Particle (SEP) events. We study the kinematic CME characteristics in terms of their radial and lateral expansion, from their early evolution in the Sun’s atmosphere as observed in EUV imagers and coronagraphs. The data covers 72 CMEs that occurred in the time range July 2010 to September 2012, where the twin STEREO spacecraft where in quasi-quadrature to the Sun-Earth line. From the STEREO point-of-view, the CMEs under study were observed close to the limb. We calculated the radial and lateral height (width) versus time profiles and derived the corresponding peak and mean velocities, accelerations and angular expansion rates, with particular emphasis on the role of potential lateral overexpansion in the early CME evolution. We find high correlations between the radial and lateral CME velocities and accelerations. CMEs which are associated to SEPs tend to be located at the high value end of the distributions of velocities, widths and expansion rates compared to non-SEP associated events.



Approaching deadlines:

Registration opens:

16 July 2020

Abstract submission opens:

16 July 2020

European Space Weather Medals:

6 September 2020

Registration deadline:

25 September 2020

Registration deadline: [extended]

10 October 2020

Abstract submission deadline:

4 September 2020