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A Model for Flux-Rope Formation and Disconnection in Pseudostreamer Coronal Mass Ejections [dataset] Open Access
Coronal mass ejections (CMEs) from pseudostreamers represent a significant fraction of large-scale eruptions from the Sun. In some cases, these CMEs take a narrow jet-like form reminiscent of coronal jets; in others, they have a much broader fan-shaped morphology like CMEs from helmet streamers. We present results from a magnetohydrodynamic simulation of a broad pseudostreamer CME. The early evolution of the eruption is initiated through a combination of breakout interchange reconnection at the overlying null point and ideal instability of the flux rope that forms within the pseudostreamer. This stage is characterised by a rolling motion and deflection of the flux rope toward the breakout current layer. The stretching out of the strapping field forms a flare current sheet below the flux rope; reconnection onset there forms low-lying flare arcade loops and the two-ribbon flare footprint. Once the CME flux rope breaches the rising breakout current layer, interchange reconnection with the external open field disconnects one leg from the Sun. This induces a whip-like rotation of the flux rope, generating the unstructured fan shape characteristic of pseudostreamer CMEs. Interchange reconnection behind the CME releases torsional Alfvén waves and bursty dense outflows into the solar wind. Our results demonstrate that pseudostreamer CMEs follow the same overall magnetic evolution as coronal jets, although they present different morphologies of their ejecta. We conclude that pseudostreamer CMEs should be considered a class of eruptions that are distinct from helmet-streamer CMEs, in agreement with previous observational studies.
Descriptions
- Resource type
- Dataset
- Contributors
- Creator:
Wyper, Peter
1
Creator: Lynch, Ben 2
1 Durham University
2 University of California, Berkeley
- Funder
-
Science and Technology Facilities Council
Leverhulme Trust
Department for Business, Innovation and Skills
- Research methods
- Other description
-
Includes data in Flicks format, Fortran code and Python code.
- Keyword
- Solar corona
Coronal mass ejection
Solar flare
Magnetic reconnection
- Subject
-
Magnetic reconnection
Coronal mass ejections
Solar-terrestrial physics
- Location
- Language
- Cited in
- Identifier
- ark:/32150/r1fb494847x
doi:10.15128/r1fb494847x
- Rights
- Creative Commons Attribution 4.0 International (CC BY)
- Publisher
-
Durham University
- Date Created
File Details
- Depositor
- P.F. Wyper
- Date Uploaded
- 30 July 2024, 11:07:20
- Date Modified
- 30 July 2024, 15:07:41
- Audit Status
- Audits have not yet been run on this file.
- Characterization
- not yet characterized