Explanipedia

Determining the 3D Dynamics of Solar Flare Magnetic Reconnection Open

Joel Dahlin, S. K. Antiochos, P. F. Wyper, Jiong Qiu, C. R. DeVore · 2025

Solar flares are major space weather events that result from the explosive conversion of stored magnetic energy into bulk motion, plasma heating, and particle acceleration. While the standard flare model has proven highly successful in exp…

Solar Eruption Onset and Particle Acceleration in Nested-Null Topologies Open

Pankaj Kumar, J. T. Karpen, P. F. Wyper, D. Lario, Spiro K. Antiochos , et al. · 2025

The magnetic breakout model explains a variety of solar eruptions, ranging from small-scale jets to large-scale coronal mass ejections (CMEs). Most of our previous studies are focused on jets and CMEs in single null-point topologies. Here,…

Deriving the Coronal Separatrix‐Web With the WSA Model Open

Samantha Wallace, A. K. Higginson, D. G. Simpson, N. M. Viall, P. F. Wyper , et al. · 2025

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 () and we use Carrington …

Metis Observations of Alfvénic Outflows Driven by Interchange Reconnection in a Pseudostreamer Open

P. Romano, P. F. Wyper, V. Andretta, S. K. Antiochos, G. Russano , et al. · 2025

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. Utilizin…

Synthetic Remote-sensing and In Situ Observations of Fine-scale Structure in a Pseudostreamer Coronal Mass Ejection through the Solar Corona Open

B. J. Lynch, P. F. Wyper, Erika Palmerio, Lizet Casillas, Joel Dahlin , et al. · 2025

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. magnetohydrodyna…

Metis Observations of Alfvénic Outflows Driven by Interchange Reconnection in a Pseudostreamer Open

Pierdonato Romano, P. F. Wyper, V. Andretta, S. K. Antiochos, G. Russano , et al. · 2025

This study presents observations of a large pseudostreamer solar eruption and, in particular, the post-eruption relaxation phase, as captured by Metis onboard the Solar Orbiter on October 12, 2022, during its perihelion passage. Utilizing …

Synthetic Remote-sensing and In-situ Observations of Fine-scale Structure in a Pseudostreamer Coronal Mass Ejection through the Solar Corona Open

B. J. Lynch, P. F. Wyper, Erika Palmerio, Lizet Casillas, Joel Dahlin , et al. · 2025

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. (2024, ApJ 975, …

A Model for Flux Rope Formation and Disconnection in Pseudostreamer Coronal Mass Ejections Open

P. F. Wyper, B. J. Lynch, C. R. DeVore, Pankaj Kumar, S. K. Antiochos , et al. · 2024

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 broad…

Propagation of untwisting solar jets from the low-beta corona into the super-Alfvénic wind: Testing a solar origin scenario for switchbacks Open

J. Touresse, É. Pariat, C. Froment, V. Aslanyan, P. F. Wyper , et al. · 2024

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 origina…

Solar Eruptions in Nested Magnetic Flux Systems Open

J. T. Karpen, Pankaj Kumar, P. F. Wyper, C. R. DeVore, S. K. Antiochos · 2024

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…

Magnetic reconnection Open

D. I. Pontin, P. F. Wyper, E. R. Priest · 2024

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 dri…

What impact does the pathway through the solar corona make on CMEs? Open

P. F. Wyper · 2023

Decades of observations have revealed that Coronal Mass Ejections (CMEs) come in a variety of forms. Some have a classic 3-part structure, whilst others can be fan shaped or jet-like. Some of these differences can be put down to projection…

Plasmoids, Flows, and Jets during Magnetic Reconnection in a Failed Solar Eruption Open

Pankaj Kumar, J. T. Karpen, S. K. Antiochos, C. R. DeVore, P. F. Wyper , et al. · 2023

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…

Plumelets : dynamic filamentary structures in solar coronal plumes Open

V. M. Uritsky, C. E. DeForest, J. T. Karpen, C. R. DeVore, Pankaj Kumar , et al. · 2023

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 transien…

From pseudostreamer jets to coronal mass ejections : observations of the breakout continuum Open

Pankaj Kumar, J. T. Karpen, S. K. Antiochos, P. F. Wyper, C. R. DeVore , et al. · 2023

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 …

A model for the coupled eruption of a pseudostreamer and helmet streamer Open

P. F. Wyper, S. K. Antiochos, C. R. DeVore, B. J. Lynch, J. T. Karpen , et al. · 2023

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 …

Plasmoids, Flows, and Jets During Magnetic Reconnection in a Failed Solar Eruption Open

Pankaj Kumar, J. T. Karpen, S. K. Antiochos, C. R. DeVore, P. F. Wyper , et al. · 2022

We report a detailed analysis of a failed eruption and flare in active region 12018 on 2014 April 3 using multiwavelength observations from SDO/AIA, IRIS, STEREO, and Hinode/SOT. At least four jets were observed to emanate from the cusp of…

The Imprint of Intermittent Interchange Reconnection on the Solar Wind Open

P. F. Wyper, C. R. DeVore, S. K. Antiochos, D. I. Pontin, A. K. Higginson , et al. · 2022

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, …

Comparison of magnetic energy and helicity in coronal jet simulations Open

É. Pariat, P. F. Wyper, L. Linan · 2022

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 s…

Editorial: Flux rope interaction with the ambient corona: From jets to CMEs Open

P. F. Wyper, Pankaj Kumar, B. J. Lynch · 2022

The parallel improvements in instrumentation, physical insight and numerical simulations over time were 13 highlighted along with the ways in which improvements in one area led to developments in another. Overall, 14 jets of all forms are …

An exact threshold for separator bifurcation Open

Christopher Prior, P. F. Wyper · 2022

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 …

The Dynamic Structure of Coronal Hole Boundaries Open

V. Aslanyan, D. I. Pontin, Roger B. Scott, A. K. Higginson, P. F. Wyper , et al. · 2022

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 intercha…

The Dynamic Coupling of Streamers and Pseudostreamers to the Heliosphere Open

V. Aslanyan, D. I. Pontin, A. K. Higginson, P. F. Wyper, Roger B. Scott , et al. · 2022

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 structur…

Spatially Separated Electron and Proton Beams in a Simulated Solar Coronal Jet Open

Ross Pallister, P. F. Wyper, D. I. Pontin, C. R. DeVore, Federica Chiti · 2021

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 …

Is Flare Ribbon Fine Structure Related to Tearing in the Flare Current Sheet? Open

P. F. Wyper, D. I. Pontin · 2021

Observations of solar flare ribbons show significant fine structure in the form of breaking wavelike perturbations and spirals. The origin of this structure is not well understood, but one possibility is that it is related to the tearing i…

Is flare-ribbon fine structure related to tearing in the flare current\n sheet? Open

P. F. Wyper, D. I. Pontin · 2021

Observations of solar flare ribbons show significant fine structure in the\nform of breaking wave-like perturbations and spirals. The origin of this\nstructure is not well understood, but one possibility is that it is related to\nthe teari…

The Dynamic Formation of Pseudostreamers Open

Roger B. Scott, D. I. Pontin, S. K. Antiochos, C. R. DeVore, P. F. Wyper · 2021

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 st…

Effects of Pseudostreamer Boundary Dynamics on Heliospheric Field and Wind Open

V. Aslanyan, D. I. Pontin, P. F. Wyper, Roger B. Scott, S. K. Antiochos , et al. · 2021

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…

Observations and 3D Magnetohydrodynamic Modeling of a Confined Helical Jet Launched by a Filament Eruption Open

Lauren Doyle, P. F. Wyper, E. Scullion, J. A. McLaughlin, Gavin Ramsay , et al. · 2019

We present a detailed analysis of a confined filament eruption and jet associated with a C1.5 class solar flare. Multi-wavelength observations from the Global Oscillations Network Group and Solar Dynamics Observatory reveal the filament fo…

Numerical simulation of helical jets at active region peripheries Open

P. F. Wyper, C. R. DeVore, S. K. Antiochos · 2019

Coronal jets are observed above minority-polarity intrusions throughout the solar corona. Some of the most energetic ones occur on the periphery of active regions where the magnetic field is strongly inclined. These jets exhibit a non-radi…

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