Explanipedia

Supergranulation and Poleward Migration of the Magnetic Field at High Latitudes of the Sun Open

L. P. Chitta, D. Calchetti, J. Hirzberger, G. Valori, E. R. Priest , et al. · 2025

Magnetoconvection at the solar surface governs the dynamics in the upper solar atmosphere and sustains the heliosphere. Properties of this fundamental process are poorly described near the solar poles. Here we report the first out-of-eclip…

Solar Orbiter’s 2024 Major Flare Campaigns: An Overview Open

Daniel F. Ryan, Laura A. Hayes, Hannah Collier, G. Kerr, Andrew Inglis , et al. · 2025

Solar Orbiter conducted a series of flare-optimised observing campaigns in 2024 using the Major Flare Solar Orbiter Observing Plan (SOOP). Dedicated observations were performed during two distinct perihelia intervals in March/April and Oct…

Accessing the fine temporal scale of EUV brightenings and their quasi-periodic pulsations: 1-second cadence observations by Solar Orbiter/EUI Open

Daye Lim, Tom Van Doorsselaere, Nancy Narang, Laura A. Hayes, Emil Kraaikamp , et al. · 2025

Context. Small-scale extreme-ultraviolet (EUV) transient brightenings are observationally abundant and critically important to investigate. Determining whether they share the same physical mechanisms as larger-scale flares would have signi…

Accessing the fine temporal scale of EUV brightenings and their quasi-periodic pulsations: 1 second cadence observations by Solar Orbiter/EUI Open

Daye Lim, Tom Van Doorsselaere, Nancy Narang, Laura A. Hayes, Emil Kraaikamp , et al. · 2025

Small scale extreme ultraviolet (EUV) transient brightenings are observationally abundant and critically important to investigate. Determining whether they share the same physical mechanisms as larger scale flares would have significant im…

Buildup, Explosion, and Untwisting of a Solar Active Region Jet Observed with Solar Orbiter, IRIS, and SDO Open

Navdeep K. Panesar, Alphonse C. Sterling, Ronald L. Moore, Sanjiv K. Tiwari, D. Berghmans , et al. · 2025

We present detailed analysis of an active region coronal jet accompanying a minifilament eruption that is fully captured and well-resolved in high spatial resolution 174A coronal images from Solar Orbiters Extreme Ultraviolet Imager (EUI).…

Coexistence of Longitudinal and Transverse Oscillations in Polar Plumes Observed with Solar Orbiter/Extreme Ultraviolet Imager Open

Upasna Baweja, Vaibhav Pant, S. Krishna Prasad, Arpit Kumar Shrivastav, Tom Van Doorsselaere , et al. · 2025

Magnetohydrodynamic waves play a key role in heating the solar corona and driving the solar wind. Recent observations have shown the presence of slow magnetoacoustic and Alfvénic waves in polar plumes and interplumes. However, a complete u…

Co-existence of longitudinal and transverse oscillations in polar plumes observed with Solar Orbiter/EUI Open

Upasna Baweja, Vaibhav Pant, S. Krishna Prasad, Arpit Kumar Shrivastav, Tom Van Doorsselaere , et al. · 2025

Magnetohydrodynamic (MHD) waves play a key role in heating the solar corona and driving the solar wind. Recent observations have shown the presence of slow magneto-acoustic and Alfvénic waves in polar plumes and inter-plumes. However, a co…

Thin coronal jets and plasmoid-mediated reconnection Open

Daniel Nóbrega-Siverio, Reetika Joshi, Eva Sola-Viladesau, David Berghmans, Daye Lim · 2025

Context. Coronal jets are ubiquitous, collimated million-degree ejections that contribute to the energy and mass supply of the upper solar atmosphere and the solar wind. Solar Orbiter observations provide an unprecedented opportunity to st…

Extreme-ultraviolet transient brightenings in the quiet-Sun corona Open

Nancy Narang, C. Verbeeck, M. Mierla, David Berghmans, F. Auchère , et al. · 2025

Context. The extreme-ultraviolet (EUV) brightenings identified by Solar Orbiter, commonly known as campfires, are the smallest transient brightenings detected to date outside active regions in the solar corona. Aims. In order to understand…

Thin coronal jets and plasmoid-mediated reconnection: Insights from Solar Orbiter observations and Bifrost simulations Open

Daniel Nóbrega-Siverio, Reetika Joshi, Eva Sola-Viladesau, D. Berghmans, Daye Lim · 2025

Coronal jets are ubiquitous, collimated million-degree ejections that contribute to the energy and mass supply of the upper solar atmosphere and the solar wind. Solar Orbiter provides an unprecedented opportunity to observe fine-scale jets…

The Dynamics of the Extreme Ultraviolet Quiet Sun and Coronal Holes in the Solar Orbiter Era Open

L. K. Harra, Krzysztof Barczyński, F. Auchère, D. Berghmans, L. P. Chitta , et al. · 2025

The quiet Sun corona and coronal holes, as seen in the extreme ultraviolet (EUV), host a variety of phenomena that operate over a range of spatial and temporal scales. Dynamic brightenings and jets of at most a few megameters appear to evo…

Reconnection Nanojets in an Erupting Solar Filament with Unprecedented High Speeds Open

Yuhang Gao, Hui Tian, D. Berghmans, Yadan Duan, Tom Van Doorsselaere , et al. · 2025

Solar nanojets are small-scale jets generated by component magnetic reconnection, characterized by collimated plasma motion perpendicular to the reconnecting magnetic field lines. As an indicator of nanoflare events, they are believed to p…

Quasi-periodic pulsations in extreme-ultraviolet brightenings Open

Daye Lim, Tom Van Doorsselaere, David Berghmans, Laura A. Hayes, C. Verbeeck , et al. · 2025

Context. Extreme-ultraviolet (EUV) observations have revealed small-scale transient brightenings that may be caused by the same physical mechanisms as larger-scale solar flares. A notable feature of solar and stellar flares is the presence…

Transverse waves observed in a fibril with the MiHI prototype Open

E. Petrova, Tom Van Doorsselaere, M. van Noort, D. Berghmans, J. S. Castellanos Durán · 2025

Context. Fine-scale structures of the solar chromosphere, particularly fibrils, are known to host various types of magnetohydrodynamic (MHD) waves that can transport energy to the corona. In particular, absorption features observed in the …

Coronal hole picoflare jets are progenitors of both fast and Alfvénic slow solar wind Open

L. P. Chitta, Z. Huang, R. D’Amicis, D. Calchetti, A. N. Zhukov , et al. · 2025

Solar wind, classified by its bulk speed and the Alfvénic nature of its fluctuations, generates the heliosphere. The elusive physical processes responsible for the generation of the different types of this wind are a topic of active debate…

On the Existence of Long-period Decayless Oscillations in Short Active Region Loops Open

Arpit Kumar Shrivastav, Vaibhav Pant, Rohan Kumar, D. Berghmans, Tom Van Doorsselaere , et al. · 2025

Decayless kink oscillations, characterized by their lack of decay in amplitude, have been detected in coronal loops of varying scales in active regions, the quiet Sun, and coronal holes. Short-period (<50 s) decayless oscillations have bee…

Coronal hole picoflare jets are progenitors of both fast and Alfvénic slow solar wind Open

L. P. Chitta, Z. Huang, R. D'Amicis, D. Calchetti, A. N. Zhukov , et al. · 2024

Solar wind, classified by its bulk speed and the Alfvénic nature of its fluctuations, generates the heliosphere. The elusive physical processes responsible for the generation of the different types of this wind are a topic of active debate…

On the Existence of Long-Period Decayless Oscillations in Short Active Region Loops Open

Arpit Kumar Shrivastav, Vaibhav Pant, Ritesh Kumar, D. Berghmans, Tom Van Doorsselaere , et al. · 2024

Decayless kink oscillations, characterized by their lack of decay in amplitude, have been detected in coronal loops of varying scales in active regions, quiet Sun and coronal holes. Short-period (< 50 s) decayless oscillations have been de…

Solar flares in the Solar Orbiter era: Short-exposure EUI/FSI observations of STIX flares Open

Hannah Collier, Laura A. Hayes, Stefan Purkhart, Säm Krucker, Daniel F. Ryan , et al. · 2024

Aims. This paper aims to demonstrate the importance of short-exposure extreme ultraviolet (EUV) observations of solar flares in the study of particle acceleration, heating, and energy partition in flares. This work highlights the observati…

Solar flares in the Solar Orbiter era: Short-exposure EUI/FSI observations of STIX flares Open

Hannah Collier, Laura A. Hayes, Stefan Purkhart, Säm Krucker, Daniel F. Ryan , et al. · 2024

Aims: This paper aims to demonstrate the importance of short-exposure extreme ultraviolet (EUV) observations of solar flares in the study of particle acceleration, heating and energy partition in flares. This work highlights the observatio…

A multi-instrument study of UV bursts and associated surges in AR 12957 Open

C. J. Nelson, D. Calchetti, A. Gandorfer, J. Hirzberger, J. Sinjan , et al. · 2024

Context. The relationship between UV bursts and solar surges is complex, with these events sometimes being observed together and sometimes being observed independently. Why this sporadic association exists is unknown; however, it likely re…

Undersampling effects on observed periods of coronal oscillations Open

Daye Lim, Tom Van Doorsselaere, V. M. Nakariakov, Dmitrii Y. Kolotkov, Yuhang Gao , et al. · 2024

Context. Recent observations of decayless transverse oscillations have revealed two branches in the relationship between period and loop length. One is a linear relationship, interpreted as a standing mode, while the other shows almost no …

Characteristics and energy flux distributions of decayless transverse oscillations depending on coronal regions Open

Daye Lim, Tom Van Doorsselaere, D. Berghmans, Elena Petrova · 2024

Context. It has been proposed that the slope ( δ ) of the power-law distribution between the energy flux and oscillation frequency could determine whether high-frequency transverse oscillations make a dominant contribution to the heating (…

Characteristics and Energy Flux Distributions of Decayless Transverse Oscillations Depending on Coronal Regions Open

Daye Lim, Tom Van Doorsselaere, D. Berghmans, Elena Petrova · 2024

Lim et al. (2023) have recently proposed that the slope ($δ$) of the power law distribution between the energy flux and oscillation frequency could determine whether high-frequency transverse oscillations give a dominant contribution to th…

Observations of fan-spine topology by Solar Orbiter/EUI: Rotational motions and indications of Alfvén waves Open

E. Petrova, Tom Van Doorsselaere, D. Berghmans, S. Parenti, G. Valori , et al. · 2024

Context. Torsional Alfvén waves do not produce any intensity variation and are therefore challenging to observe with imaging instruments. Previously, Alfvén wave observations were reported throughout all the layers of the solar atmosphere …

Linking Solar Flare Observations to a Series of Impulsive Solar Energetic Particle Events Measured with Solar Orbiter at 0.5 AU Open

Mario Roco, Nils Janitzek, L. Berger, Patrick Kühl, Verena Heidrich-Meisner , et al. · 2024

Impulsive solar energetic particle (SEP) events are typically associated with solar flares but the related particle injection and acceleration processes are still not well understood. We use in-situ and remote-sensing data from Solar Orbit…

Investigating coronal loop morphology and dynamics from two vantage points Open

Sudip Mandal, Hardi Peter, J. A. Klimchuk, S. K. Solanki, L. P. Chitta , et al. · 2024

Coronal loops are the fundamental building blocks of the solar corona. Therefore, comprehending their properties is essential in unraveling the dynamics of the upper solar atmosphere. In this study, we conduct a comparative analysis of the…

Statistical investigation of decayless oscillations in small-scale coronal loops observed by Solar Orbiter/EUI Open

Arpit Kumar Shrivastav, Vaibhav Pant, D. Berghmans, A. N. Zhukov, Tom Van Doorsselaere , et al. · 2024

Decayless kink oscillations are omnipresent in the solar atmosphere, and they are a viable candidate for coronal heating. Although there have been extensive studies of decayless oscillations in coronal loops with lengths of a few hundred m…

Investigating coronal loop morphology and dynamics from two vantage points Open

Sudip Mandal, Hardi Peter, J. A. Klimchuk, S. K. Solanki, L. P. Chitta , et al. · 2024

Coronal loops serve as the fundamental building blocks of the solar corona. Therefore, comprehending their properties is essential in unraveling the dynamics of the Sun's upper atmosphere. In this study, we conduct a comparative analysis o…

Proceedings of the 3rd BINA Workshop: Scientific Potential of Indo-Belgian Co-operation Open

Santosh Joshi, P. De Cat, M. De Becker, K. Kolenberg, Soumen Mondal , et al. · 2024

In this report, we present an overview of the 3rd BINA workshop hosted by ARIES, Nainital on a broad theme the Scientific potential of the Indo-Belgian co-operation. Further, an introduction of the proceedings of the 3rd BINA workshop is a…

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