EGU21-3216
https://doi.org/10.5194/egusphere-egu21-3216
EGU General Assembly 2021
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

 Statistical study of CMEs, lateral overexpansion and SEP events

Alexandros Adamis1, Astrid Veronig2, Tatiana Podladchikova1, Karin Dissauer7, Rositsa Miteva9, Jingnan Guo6, Veronika Haberle2, Mateja Dumbovic3, Manuela Temmer2, Kamen Kozarev5, Jasmina Magdalenic4, and Christina Kay8
Alexandros Adamis et al.
  • 1skolkovo institute of science and technology, Engineering Systems, Moskovskaya oblast, Russian Federation (alexandros.adamis@skoltech.ru)
  • 2Institute of Physics, University of Graz, Austria
  • 3University of Zagreb, Faculty of Geodesy, Hvar Observatory, Croatia
  • 4SIDC, Royal Observatory of Belgium, Brussels , Belgium
  • 5Bulgarian Academy of Sciences , BAS
  • 6University of Science and Technology of China
  • 7NorthWest Research Associates, United States
  • 8NASA, United States
  • 9Institute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences, Bulgaria

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 of July 2010 to September 2012, where the twin STEREO spacecraft where in quasiquadrature 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 that are associated tend to be located at the high-value end of the distributions of velocities, widths, and expansion rates compared to nonSEP associated events.

How to cite: Adamis, A., Veronig, A., Podladchikova, T., Dissauer, K., Miteva, R., Guo, J., Haberle, V., Dumbovic, M., Temmer, M., Kozarev, K., Magdalenic, J., and Kay, C.:  Statistical study of CMEs, lateral overexpansion and SEP events, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-3216, https://doi.org/10.5194/egusphere-egu21-3216, 2021.

Displays

Display file