All Outputs (43)

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. (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.

Comparison of magnetic energy and helicity in coronal jet simulations (2023)
Journal Article
Pariat, E., Wyper, P., & Linan, L. (2023). Comparison of magnetic energy and helicity in coronal jet simulations. Astronomy & Astrophysics, 669, Article A33. https://doi.org/10.1051/0004-6361/202245142

Context. While non-potential (free) magnetic energy is a necessary element of any active phenomenon in the solar corona, its role as a marker of the trigger of the eruptive process remains elusive. Meanwhile, recent analyses of numerical simulations... Read More about Comparison of magnetic energy and helicity in coronal jet simulations.

The Imprint of Intermittent Interchange Reconnection on the Solar Wind (2022)
Journal Article
Wyper, P. F., DeVore, C., Antiochos, S., Pontin, D., Higginson, A. K., Scott, R., …Pelegrin-Frachon, T. (2022). The Imprint of Intermittent Interchange Reconnection on the Solar Wind. Astrophysical Journal Letters, 941(2), Article L29. https://doi.org/10.3847/2041-8213/aca8ae

The solar wind is known to be highly structured in space and time. Observations from Parker Solar Probe have revealed an abundance of so-called magnetic switchbacks within the near-Sun solar wind. In this Letter, we use a high-resolution, adaptive-me... Read More about The Imprint of Intermittent Interchange Reconnection on the Solar Wind.

An exact threshold for separator bifurcation (2022)
Journal Article
Prior, C., & Wyper, P. (2022). An exact threshold for separator bifurcation. Geophysical and Astrophysical Fluid Dynamics, 116(4), 321-349. https://doi.org/10.1080/03091929.2022.2085696

Reconnection involving magnetic separators is known to lead to the spontaneous generation of new separator pairs. In this work, we explore the bifurcation process for a system composed of a pair of null points with a joining separator. We begin with... Read More about An exact threshold for separator bifurcation.

The Dynamic Structure of Coronal Hole Boundaries (2022)
Journal Article
Aslanyan, V., Pontin, D., Scott, R., Higginson, A., Wyper, P., & Antiochos, S. (2022). The Dynamic Structure of Coronal Hole Boundaries. Astrophysical Journal, 931(2), Article 96. https://doi.org/10.3847/1538-4357/ac69ed

The boundaries of solar coronal holes are difficult to uniquely define observationally but are sites of interest in part because the slow solar wind appears to originate there. The aim of this article is to explore the dynamics of interchange magneti... Read More about The Dynamic Structure of Coronal Hole Boundaries.

The Dynamic Coupling of Streamers and Pseudostreamers to the Heliosphere (2022)
Journal Article
Aslanyan, V., Pontin, D., Higginson, A., Wyper, P., Scott, R., & Antiochos, S. (2022). The Dynamic Coupling of Streamers and Pseudostreamers to the Heliosphere. Astrophysical Journal, 929(2), Article 185. https://doi.org/10.3847/1538-4357/ac5d5b

The slow solar wind is generally believed to result from the interaction of open and closed coronal magnetic flux at streamers and pseudostreamers. We use three-dimensional magnetohydrodynamic simulations to determine the detailed structure and dynam... Read More about The Dynamic Coupling of Streamers and Pseudostreamers to the Heliosphere.

Spatially Separated Electron and Proton Beams in a Simulated Solar Coronal Jet (2021)
Journal Article
Pallister, R., Wyper, P. F., Pontin, D. I., DeVore, C. R., & Chiti, F. (2021). Spatially Separated Electron and Proton Beams in a Simulated Solar Coronal Jet. Astrophysical Journal, 923(2), Article 163. https://doi.org/10.3847/1538-4357/ac2e6d

Magnetic reconnection is widely accepted to be a major contributor to nonthermal particle acceleration in the solar atmosphere. In this paper we investigate particle acceleration during the impulsive phase of a coronal jet, which involves bursty reco... Read More about Spatially Separated Electron and Proton Beams in a Simulated Solar Coronal Jet.

Is flare-ribbon fine structure related to tearing in the flare current sheet? (2021)
Journal Article
Wyper, P., & Pontin, D. (2021). Is flare-ribbon fine structure related to tearing in the flare current sheet?. Astrophysical Journal, 920(2), Article 102. https://doi.org/10.3847/1538-4357/ac1943

Observations of solar flare ribbons show significant fine structure in the form of breaking wave-like perturbations and spirals. The origin of this structure is not well understood, but one possibility is that it is related to the tearing instability... Read More about Is flare-ribbon fine structure related to tearing in the flare current sheet?.

The Dynamic Formation of Pseudostreamers (2021)
Journal Article
Scott, R. B., Pontin, D. I., Antiochos, S. K., DeVore, C. R., & Wyper, P. F. (2021). The Dynamic Formation of Pseudostreamers. Astrophysical Journal, 913(1), Article 64. https://doi.org/10.3847/1538-4357/abec4f

Streamers and pseudostreamers structure the corona at the largest scales, as seen in both eclipse and coronagraph white-light images. Their inverted-goblet appearance encloses broad coronal loops at the Sun and tapers to a narrow radial stalk away fr... Read More about The Dynamic Formation of Pseudostreamers.

A Model for the Coupled Eruption of a Pseudostreamer and Helmet Streamer (2021)
Journal Article
Wyper, P., Antiochos, S., DeVore, C., Lynch, B., Karpen, J., & Kumar, P. (2021). A Model for the Coupled Eruption of a Pseudostreamer and Helmet Streamer. Astrophysical Journal, 909(1), Article 54. https://doi.org/10.3847/1538-4357/abd9ca

A highly important aspect of solar activity is the coupling between eruptions and the surrounding coronal magnetic field topology, which determines the trajectory and morphology of the event and can even lead to sympathetic eruptions from multiple so... Read More about A Model for the Coupled Eruption of a Pseudostreamer and Helmet Streamer.

Effects of Pseudostreamer Boundary Dynamics on Heliospheric Field and Wind (2021)
Journal Article
Aslanyan, V., Pontin, D., Wyper, P., Scott, R., Antiochos, S., & DeVore, C. (2021). Effects of Pseudostreamer Boundary Dynamics on Heliospheric Field and Wind. Astrophysical Journal, 909(1), Article 10. https://doi.org/10.3847/1538-4357/abd6e6

Interchange reconnection has been proposed as a mechanism for the generation of the slow solar wind, and a key contributor to determining its characteristic qualities. In this paper we study the implications of interchange reconnection for the struct... Read More about Effects of Pseudostreamer Boundary Dynamics on Heliospheric Field and Wind.

From Pseudostreamer Jets to Coronal Mass Ejections: Observations of the Breakout Continuum (2021)
Journal Article
Kumar, P., Karpen, J. T., Antiochos, S. K., Wyper, P. F., DeVore, C. R., & Lynch, B. J. (2021). From Pseudostreamer Jets to Coronal Mass Ejections: Observations of the Breakout Continuum. Astrophysical Journal, 907(1), https://doi.org/10.3847/1538-4357/abca8b

The magnetic breakout model, in which reconnection in the corona leads to destabilization of a filament channel, explains numerous features of eruptive solar events, from small-scale jets to global-scale coronal mass ejections (CMEs). The underlying... Read More about From Pseudostreamer Jets to Coronal Mass Ejections: Observations of the Breakout Continuum.

Plumelets: Dynamic Filamentary Structures in Solar Coronal Plumes (2021)
Journal Article
Uritsky, V., DeForest, C., Karpen, J., DeVore, C., Kumar, P., Raouafi, N., & Wyper, P. (2021). Plumelets: Dynamic Filamentary Structures in Solar Coronal Plumes. Astrophysical Journal, 907(1), https://doi.org/10.3847/1538-4357/abd186

Solar coronal plumes long seemed to possess a simple geometry supporting spatially coherent, stable outflow without significant fine structure. Recent high-resolution observations have challenged this picture by revealing numerous transient, small-sc... Read More about Plumelets: Dynamic Filamentary Structures in Solar Coronal Plumes.

Observations and 3D Magnetohydrodynamic Modeling of a Confined Helical Jet Launched by a Filament Eruption (2019)
Journal Article
Doyle, L., Wyper, P. F., Scullion, E., McLaughlin, J. A., Ramsay, G., & Doyle, J. G. (2019). Observations and 3D Magnetohydrodynamic Modeling of a Confined Helical Jet Launched by a Filament Eruption. Astrophysical Journal, 887(2), Article 246. https://doi.org/10.3847/1538-4357/ab5d39

We present a detailed analysis of a confined filament eruption and jet associated with a C1.5 class solar flare. Multiwavelength observations from the Global Oscillations Network Group and Solar Dynamics Observatory reveal the filament forming over s... Read More about Observations and 3D Magnetohydrodynamic Modeling of a Confined Helical Jet Launched by a Filament Eruption.

First Detection of Plasmoids from Breakout Reconnection on the Sun (2019)
Journal Article
Kumar, P., Karpen, J. T., Antiochos, S. K., Wyper, P. F., & DeVore, C. R. (2019). First Detection of Plasmoids from Breakout Reconnection on the Sun. Astrophysical Journal Letters, 885(1), Article L15. https://doi.org/10.3847/2041-8213/ab45f9

Transient collimated plasma ejections (jets) occur frequently throughout the solar corona, in active regions, quiet Sun, and coronal holes. Although magnetic reconnection is generally agreed to be the mechanism of energy release in jets, the factors... Read More about First Detection of Plasmoids from Breakout Reconnection on the Sun.

Numerical Simulation of Helical Jets at Active Region Peripheries (2019)
Journal Article
Wyper, P. F., DeVore, C. R., & Antiochos, S. K. (2019). Numerical Simulation of Helical Jets at Active Region Peripheries. Monthly Notices of the Royal Astronomical Society, 490(3), 3679-3690. https://doi.org/10.1093/mnras/stz2674

Coronal jets are observed above minority polarity intrusions throughout the solar corona. Some of the most energetic occur on the periphery of active regions where the magnetic field is strongly inclined. These jets exhibit a non-radial propagation i... Read More about Numerical Simulation of Helical Jets at Active Region Peripheries.