Deriving the interaction point between a Coronal Mass Ejection and High Speed Stream: A case study
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866910978815295488 |
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| author | Remeshan, Akshay Kumar Dumbovic, Mateja Temmer, Manuela |
| author_facet | Remeshan, Akshay Kumar Dumbovic, Mateja Temmer, Manuela |
| contents | We analyze the interaction between an Interplanetary Coronal Mass Ejection (ICME) detected in situ at the L1 Lagrange point on 2016 October 12 with a trailing High-Speed Stream (HSS). We aim to estimate the region in the interplanetary (IP) space where the interaction happened/started using a combined observational-modeling approach. We use Minimum Variance Analysis and the Walen test to analyze possible reconnection exhaust at the interface of ICME and HSS. We perform a Graduated Cylindrical Shell reconstruction of the CME to estimate the geometry and source location of the CME. Finally, we use a two-step Drag Based Model (DBM) model to estimate the region in IP space where the interaction took place. The magnetic obstacle (MO) observed in situ shows a fairly symmetric and undisturbed structure and shows the magnetic flux, helicity, and expansion profile/speed of a typical ICME. The MVA together with the Walen test, however, confirms reconnection exhaust at the ICME HSS boundary. Thus, in situ signatures are in favor of a scenario where the interaction is fairly recent. The trailing HSS shows a distinct velocity profile which first reaches a semi-saturated plateau with an average velocity of 500 km/s and then saturates at a maximum speed of 710 km/s . We find that the HSS interaction with the ICME is influenced only by this initial plateau. The results of the two-step DBM suggest that the ICME has started interacting with the HSS close to Earth (approx 0.81 au), which compares well with the deductions from in situ signatures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_00615 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Deriving the interaction point between a Coronal Mass Ejection and High Speed Stream: A case study Remeshan, Akshay Kumar Dumbovic, Mateja Temmer, Manuela Solar and Stellar Astrophysics Earth and Planetary Astrophysics Space Physics We analyze the interaction between an Interplanetary Coronal Mass Ejection (ICME) detected in situ at the L1 Lagrange point on 2016 October 12 with a trailing High-Speed Stream (HSS). We aim to estimate the region in the interplanetary (IP) space where the interaction happened/started using a combined observational-modeling approach. We use Minimum Variance Analysis and the Walen test to analyze possible reconnection exhaust at the interface of ICME and HSS. We perform a Graduated Cylindrical Shell reconstruction of the CME to estimate the geometry and source location of the CME. Finally, we use a two-step Drag Based Model (DBM) model to estimate the region in IP space where the interaction took place. The magnetic obstacle (MO) observed in situ shows a fairly symmetric and undisturbed structure and shows the magnetic flux, helicity, and expansion profile/speed of a typical ICME. The MVA together with the Walen test, however, confirms reconnection exhaust at the ICME HSS boundary. Thus, in situ signatures are in favor of a scenario where the interaction is fairly recent. The trailing HSS shows a distinct velocity profile which first reaches a semi-saturated plateau with an average velocity of 500 km/s and then saturates at a maximum speed of 710 km/s . We find that the HSS interaction with the ICME is influenced only by this initial plateau. The results of the two-step DBM suggest that the ICME has started interacting with the HSS close to Earth (approx 0.81 au), which compares well with the deductions from in situ signatures. |
| title | Deriving the interaction point between a Coronal Mass Ejection and High Speed Stream: A case study |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics Space Physics |
| url | https://arxiv.org/abs/2410.00615 |