EGU24-8788, updated on 08 Mar 2024
https://doi.org/10.5194/egusphere-egu24-8788
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

CME-CME-CIR interaction - comparison of "homologous" events from two different solar rotations 

Manuela Temmer1, Mateja Dumbovic2, Karmen Martinic2, Greta M. Cappello1, Akshay K. Remeshan2, Daniel Milosic1, Florian Koller1, Jasa Calogovic2, and Filip Matkovic2
Manuela Temmer et al.
  • 1University of Graz, Institute of Physics, Graz, Austria (manuela.temmer@uni-graz.at)
  • 2University of Zagreb, Hvar Observatory, Faculty of Geodesy, Zagreb, Croatia

Solar cycle 25 might be close to its expected peak and related activity is at a high. In 2023 many complex events were observed remotely and measured in-situ. Some of them even caused aurorae in low latitudes, repeatedly confirming that the interaction between multiple CMEs, as well as CIRs, lead to extreme conditions in near-Earth space. We study a set of “homologous” events on the Sun, where several CMEs interacted and additionally interfered by a high-speed stream from a coronal hole. The two sets of events involve the same active regions and coronal hole but are separated by a full solar rotation. We point out the complexity for each set of events and aim to understand how the global magnetic field configuration leads to a general similarity in the activation of the CME source regions. The studied in-situ measurements are connected to the solar surface observations and interpreted by processes caused due to shock-magnetic obstacle interaction.

How to cite: Temmer, M., Dumbovic, M., Martinic, K., Cappello, G. M., Remeshan, A. K., Milosic, D., Koller, F., Calogovic, J., and Matkovic, F.: CME-CME-CIR interaction - comparison of "homologous" events from two different solar rotations , EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-8788, https://doi.org/10.5194/egusphere-egu24-8788, 2024.