Outputs (48)

Deriving the Coronal Separatrix‐Web With the WSA Model (2025)
Journal Article
Wallace, S., Higginson, A. K., Simpson, D. G., Viall, N. M., Wyper, P., & Arge, C. N. (2025). Deriving the Coronal Separatrix‐Web With the WSA Model. Journal of Geophysical Research: Space Physics, 130(8), Article e2025JA033743. https://doi.org/10.1029/2025ja033743

We demonstrate a new capability of the Wang‐Sheeley‐Arge (WSA) model to routinely derive the coronal separatrix web (S‐web) as a standard data product. We describe our methodology for deriving the squashing factor ( Q $Q$ ) and we use Carrington rota... Read More about Deriving the Coronal Separatrix‐Web With the WSA Model.

Helmet streamer influence on the evolution of magnetic flux ropes (2025)
Journal Article
Cécere, M., Wyper, P. F., Krause, G., Sahade, A., & Rice, O. E. (2025). Helmet streamer influence on the evolution of magnetic flux ropes. Astronomy & Astrophysics, 697, Article A155. https://doi.org/10.1051/0004-6361/202450239

Context. Solar eruptions play a major role in space weather. Understanding the physical mechanisms that influence their evolution is essential for improving future predictions about the geo-effectiveness of an event. Helmet streamers (HSs) are presen... Read More about Helmet streamer influence on the evolution of magnetic flux ropes.

Metis Observations of Alfvénic Outflows Driven by Interchange Reconnection in a Pseudostreamer (2025)
Journal Article
Romano, P., Wyper, P., Andretta, V., Antiochos, S., Russano, G., Spadaro, D., Abbo, L., Contarino, L., Elmhamdi, A., Ferrente, F., Lionello, R., Lynch, B. J., MacNeice, P., Romoli, M., Ventura, R., Viall, N., Bemporad, A., Burtovoi, A., Da Deppo, V., De Leo, Y., …Uslenghi, M. (2025). Metis Observations of Alfvénic Outflows Driven by Interchange Reconnection in a Pseudostreamer. Astrophysical Journal, 982(2), https://doi.org/10.3847/1538-4357/adb1da

This study presents observations of a large pseudostreamer solar eruption and, in particular, the post-eruption relaxation phase, as captured by Metis, on board the Solar Orbiter, on 2022 October 12, during its perihelion passage. Utilizing total-bri... Read More about Metis Observations of Alfvénic Outflows Driven by Interchange Reconnection in a Pseudostreamer.

Synthetic Remote-sensing and In Situ Observations of Fine-scale Structure in a Pseudostreamer Coronal Mass Ejection through the Solar Corona (2025)
Journal Article
Lynch, B. J., Wyper, P. F., Palmerio, E., Casillas, L., Dahlin, J. T., Daldorff, L. K. S., Guidoni, S. E., Higginson, A. K., Kumar, P., Liberatore, A., Liewer, P. C., Panasenco, O., Penteado, P., & Velli, M. (2025). Synthetic Remote-sensing and In Situ Observations of Fine-scale Structure in a Pseudostreamer Coronal Mass Ejection through the Solar Corona. Astrophysical Journal, 277(2), Article 40. https://doi.org/10.3847/1538-4365/adb14e

Coronal pseudostreamer flux systems have a specific magnetic configuration that influences the morphology and evolution of coronal mass ejections (CMEs) from these regions. Here we continue the analysis of the Wyper et al. magnetohydrodynamic simulat... Read More about Synthetic Remote-sensing and In Situ Observations of Fine-scale Structure in a Pseudostreamer Coronal Mass Ejection through the Solar Corona.

Propagation of untwisting solar jets from the low-beta corona into the super-Alfvénic wind: Testing a solar origin scenario for switchbacks (2024)
Journal Article
Touresse, J., Pariat, E., Froment, C., Aslanyan, V., Wyper, P. F., & Seyfritz, L. (2024). Propagation of untwisting solar jets from the low-beta corona into the super-Alfvénic wind: Testing a solar origin scenario for switchbacks. Astronomy & Astrophysics, 692, Article A71. https://doi.org/10.1051/0004-6361/202452019

Context. Parker Solar Probe’s (PSP) discovery of the prevalence of switchbacks (SBs), localised magnetic deflections in the nascent solar wind, has sparked interest in uncovering their origins. A prominent theory suggests these SBs originate in the l... Read More about Propagation of untwisting solar jets from the low-beta corona into the super-Alfvénic wind: Testing a solar origin scenario for switchbacks.

A Model for Flux Rope Formation and Disconnection in Pseudostreamer Coronal Mass Ejections (2024)
Journal Article
Wyper, P. F., Lynch, B. J., DeVore, C. R., Kumar, P., Antiochos, S. K., & Daldorff, L. K. S. (2024). A Model for Flux Rope Formation and Disconnection in Pseudostreamer Coronal Mass Ejections. The Astrophysical Journal, 975(2), Article 168. https://doi.org/10.3847/1538-4357/ad7941

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-shap... Read More about A Model for Flux Rope Formation and Disconnection in Pseudostreamer Coronal Mass Ejections.

Magnetic reconnection (2024)
Book Chapter
Pontin, D. I., Wyper, P. F., & Priest, E. R. (2024). Magnetic reconnection. In A. Kumar Srivastava, M. Goossens, & I. Arregui (Eds.), Magnetohydrodynamic Processes in Solar Plasmas (345-414). Elsevier. https://doi.org/10.1016/b978-0-32-395664-2.00014-1

Magnetic reconnection is a fundamental astrophysical process and plays a key role in the dynamics of the Sun's atmosphere. It facilitates the rapid conversion of energy stored in the magnetic field into kinetic and thermal energy. This drives phenome... Read More about Magnetic reconnection.

Solar Eruptions in Nested Magnetic Flux Systems (2024)
Journal Article
Karpen, J. T., Kumar, P., Wyper, P. F., DeVore, C. R., & Antiochos, S. K. (2024). Solar Eruptions in Nested Magnetic Flux Systems. Astrophysical Journal, 966(1), Article 27. https://doi.org/10.3847/1538-4357/ad2eaa

The magnetic topology of erupting regions on the Sun is a key factor in the energy buildup and release, and the subsequent evolution of flares and coronal mass ejections (CMEs). The presence/absence of null points and separatrices dictates whether an... Read More about Solar Eruptions in Nested Magnetic Flux Systems.

Interchange reconnection dynamics in a solar coronal pseudo-streamer (2023)
Journal Article
Pellegrin-Frachon, T., Masson, S., Pariat, E., Wyper, P., & DeVore, C. (2023). Interchange reconnection dynamics in a solar coronal pseudo-streamer. Astronomy & Astrophysics, 675, Article A55. https://doi.org/10.1051/0004-6361/202245611

Context. The generation of the slow solar wind is still an open problem in heliophysics. One of the existing theories to explain the injection of coronal plasma in the interplanetary medium is based on interchange reconnection: the exchange of magnet... Read More about Interchange reconnection dynamics in a solar coronal pseudo-streamer.

Plasmoids, Flows, and Jets during Magnetic Reconnection in a Failed Solar Eruption (2023)
Journal Article
Kumar, P., T. Karpen, J., Antiochos, S. K., DeVore, C. R., Wyper, P. F., & Cho, K.-S. (2023). Plasmoids, Flows, and Jets during Magnetic Reconnection in a Failed Solar Eruption. Astrophysical Journal, 943(2), Article 156. https://doi.org/10.3847/1538-4357/acaea4

We report a detailed analysis of a failed eruption and flare in active region 12018 on 2014 April 3 using multiwavelength observations from the Solar Dynamics Observatory/Atmospheric Imaging Assembly, IRIS, STEREO, and Hinode/Solar Optical Telescope.... Read More about Plasmoids, Flows, and Jets during Magnetic Reconnection in a Failed Solar Eruption.