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Modeling the Multiple CME Interaction Event on 6-9 September 2017 with WSA-ENLIL plus Cone
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. Sorbonne Univ, CNRS, LATMOS IPSL, UVSQ, Paris, France.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division. Swedish Inst Space Phys, Uppsala, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division. Swedish Inst Space Phys, Uppsala, Sweden.ORCID iD: 0000-0003-1589-6711
Karl Franzens Univ Graz, Inst Phys, Graz, Austria.
2019 (English)In: Space Weather: The international journal of research and applications, ISSN 1542-7390, E-ISSN 1542-7390, Vol. 17, no 2, p. 357-369Article in journal (Refereed) Published
Abstract [en]

A series of coronal mass ejections (CMEs) erupted from the same active region between 4-6 September 2017. Later, on 6-9 September, two interplanetary (IP) shocks reached LE creating a complex and geoeffective plasma structure. To understand the processes leading up to the formation of the two shocks, we model the CMEs with the Wang-Sheeley-Arge (WSA)-ENLIL+Cone model. The first two CMEs merged already in the solar corona driving the first IP shock. In IP space, another fast CME presumably interacted with the flank of the preceding CMEs and caused the second shock detected in situ. By introducing a customized density enhancement factor (dcld) in the WSA-ENLIL+Cone model based on coronagraph image observations, the predicted arrival time of the first IP shock was drastically improved. When the dcld factor was tested on a well-defined single CME event from 12 July 2012 the shock arrival time saw similar improvement. These results suggest that the proposed approach may be an alternative to improve the forecast for fast and simple CMEs. Further, the slowly decelerating kilometric type II radio burst confirms that the properties of the background solar wind have been preconditioned by the passage of the first IP shock. This likely caused the last CME to experience insignificant deceleration and led to the early arrival of the second IP shock. This result emphasizes the need to take preconditioning of the IP medium into account when making forecasts of CMEs erupting in quick succession.

Place, publisher, year, edition, pages
AMER GEOPHYSICAL UNION , 2019. Vol. 17, no 2, p. 357-369
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-381198DOI: 10.1029/2018SW001993ISI: 000461858000010OAI: oai:DiVA.org:uu-381198DiVA, id: diva2:1303747
Funder
Swedish Civil Contingencies AgencyAvailable from: 2019-04-10 Created: 2019-04-10 Last updated: 2019-04-10Bibliographically approved

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Yordanova, EmiliyaDimmock, Andrew P.

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Swedish Institute of Space Physics, Uppsala DivisionDepartment of Physics and Astronomy
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Astronomy, Astrophysics and Cosmology

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