| Name: | Prateek Mayank |
| Affiliation: | Indian Institute of Technology, Indore |
| Conference ID : | ASI2024_1010 |
| Title : | Investigating the Geo-effectiveness of CME-CME Interaction through Ensemble Simulations using SWASTi Framework |
| Authors : | Prateek Mayank [1] , Stefan Lotz [2], Bhargav Vaidya [1], Dibyendu Chakrabarty [3], and Wageesh Mishra [4] |
| Authors Affiliation: | [1] Indian Institute of Technology Indore, India
[2] South African National Space Agency, South Africa
[3] Physical Research Laboratory, India
[4] Indian Institute of Astrophysics, India |
| Mode of Presentation: | Poster |
| Abstract Category : | Sun, Solar System, Exoplanets, and Astrobiology |
| Abstract : | The criticality of understanding space weather events, especially the geo-effectiveness of Coronal Mass Ejections (CMEs), stands at the forefront of our quest to predict Earth-directed solar disturbances. While considerable efforts have been invested in understanding single CMEs, the geomagnetic ramifications of CME-CME interactions remain less explored. Moreover, the emphasis has largely been on the in-situ properties of such events, with the consequential need to delve into the impact of their originating conditions. Given that these interactions typically occur beyond the range of coronagraph imaging, and in-situ measurements alone cannot fully resolve the complex three-dimensional nature of these interactions, simulation techniques emerge as an invaluable method to comprehensively analyse these intricate scenarios.
In this vein, our study harnesses the modeling capabilities of the Space Weather Adaptive SimulaTion (SWASTi) framework to simulate an ensemble of CME-CME interaction scenarios within realistic ambient solar wind conditions. By systematically examining the interplay between magnetic flux, velocity, and density variations of CMEs, we assess both the collective and individual impacts on the geomagnetic storm index, Dst, which is estimated using the empirical relation developed by O'Brien and McPherron (2000).
We present findings that highlight the critical role of the relative tilt of CMEs and demonstrate that variations in CME properties along different longitudes can significantly alter geomagnetic storm severity. Notably, we find that incremental increases in the initial density and speed of CMEs correlate with a corresponding escalation in geomagnetic activity. Intriguingly, we observe that initial magnetic flux's contribution to storm severity hinges on the chirality of the interacting CMEs, with potential magnetic reconnection leading to flux cancellation and, consequently, subdued storm conditions. This comprehensive ensemble analysis not only deepens our understanding of the magnetospheric impacts of CME interactions but also illuminates the complex interplay with the ambient solar wind.
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