Observation of a Fully-formed Forward--Reverse Shock Pair Due to the Interaction Between Two Coronal Mass Ejections at 0.5 au
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2024
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| author | Trotta, D. Dimmock, A. Blanco-Cano, X. Forsyth, R. Hietala, H. Fargette, N. Larosa, A. Lugaz, N. Palmerio, E. Good, S. W. Soljento, J. E. Kilpua, E. K. J. Yordanova, E. Pezzi, O. Nicolaou, G. Horbury, T. S. Vainio, R. Dresing, N. Owen, C. J. Wimmer-Schweingruber, R. |
| author_facet | Trotta, D. Dimmock, A. Blanco-Cano, X. Forsyth, R. Hietala, H. Fargette, N. Larosa, A. Lugaz, N. Palmerio, E. Good, S. W. Soljento, J. E. Kilpua, E. K. J. Yordanova, E. Pezzi, O. Nicolaou, G. Horbury, T. S. Vainio, R. Dresing, N. Owen, C. J. Wimmer-Schweingruber, R. |
| contents | We report direct observations of a fast magnetosonic forward--reverse shock pair observed by Solar Orbiter on March 8, 2022 at the short heliocentric distance of 0.5 au. The structure, sharing some features with fully-formed stream interaction regions (SIRs), is due to the interaction between two successive coronal mass ejections (CMEs), never previously observed to give rise to a forward--reverse shock pair. The scenario is supported by remote observations from the STEREO-A coronographs, where two candidate eruptions compatible with the in-situ signatures have been found. In the interaction region, we find enhanced energetic particle activity, strong non-radial flow deflections and evidence of magnetic reconnection. At 1~au, well radially-aligned \textit{Wind} observations reveal a complex event, with characteristic observational signatures of both SIR and CME--CME interaction, thus demonstrating the importance of investigating the complex dynamics governing solar eruptive phenomena. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2404_17315 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Observation of a Fully-formed Forward--Reverse Shock Pair Due to the Interaction Between Two Coronal Mass Ejections at 0.5 au Trotta, D. Dimmock, A. Blanco-Cano, X. Forsyth, R. Hietala, H. Fargette, N. Larosa, A. Lugaz, N. Palmerio, E. Good, S. W. Soljento, J. E. Kilpua, E. K. J. Yordanova, E. Pezzi, O. Nicolaou, G. Horbury, T. S. Vainio, R. Dresing, N. Owen, C. J. Wimmer-Schweingruber, R. Solar and Stellar Astrophysics Space Physics We report direct observations of a fast magnetosonic forward--reverse shock pair observed by Solar Orbiter on March 8, 2022 at the short heliocentric distance of 0.5 au. The structure, sharing some features with fully-formed stream interaction regions (SIRs), is due to the interaction between two successive coronal mass ejections (CMEs), never previously observed to give rise to a forward--reverse shock pair. The scenario is supported by remote observations from the STEREO-A coronographs, where two candidate eruptions compatible with the in-situ signatures have been found. In the interaction region, we find enhanced energetic particle activity, strong non-radial flow deflections and evidence of magnetic reconnection. At 1~au, well radially-aligned \textit{Wind} observations reveal a complex event, with characteristic observational signatures of both SIR and CME--CME interaction, thus demonstrating the importance of investigating the complex dynamics governing solar eruptive phenomena. |
| title | Observation of a Fully-formed Forward--Reverse Shock Pair Due to the Interaction Between Two Coronal Mass Ejections at 0.5 au |
| topic | Solar and Stellar Astrophysics Space Physics |
| url | https://arxiv.org/abs/2404.17315 |