Search Publications
High-resolution observational analysis of flare ribbon fine structures
Fletcher, Lyndsay; Nóbrega-Siverio, Daniel; Aulanier, Guillaume +4 more
Context. Since the mechanism of energy release from solar flares is still not fully understood, the study of fine-scale features developing during flares becomes important for progressing towards a consistent picture of the essential physical mechanisms. Aims. Solar flares release most of their luminous energy in the chromosphere. These luminous s…
Detection of decayless oscillations in solar transition region loops
Guo, Mingzhe; Gao, Yuhang; Van Doorsselaere, Tom +1 more
Context. Decayless kink oscillations have been frequently observed in coronal loops, serving as a valuable diagnostic tool for the coronal magnetic field. Such oscillations have never before been reported in low-lying loops of the transition region (TR).
Aims: The aim of this study is to detect decayless kink oscillations in TR loops for the …
Small-scale magnetic flux emergence preceding a chain of energetic solar atmospheric events
Rouppe van der Voort, L. H. M.; Joshi, R.; Froment, C. +4 more
Context. Advancements in instrumentation have revealed a multitude of small-scale extreme-ultraviolet (EUV) events in the solar atmosphere and considerable effort is currently undergoing to unravel them.
Aims: Our aim is to employ high-resolution and high-sensitivity magnetograms to gain a detailed understanding of the magnetic origin of such…
Spectroscopic evidence of cool plasma in quiet Sun small-scale brightenings detected by HRIEUV on board Solar Orbiter
Parenti, S.; Bocchialini, K.; Dolliou, A.
Context. A large number of small and short-lived EUV brightenings have been detected in the quiet Sun (QS) over the past three years by the High Resolution Imager of the Extreme Ultraviolet Imager (HRIEUV) on board Solar Orbiter. It remains uncertain whether these events reach coronal temperatures and, thus, whether they directly contribute to cor…
Generic low-atmosphere signatures of swirled-anemone jets
Nóbrega-Siverio, Daniel; Aulanier, Guillaume; Schmieder, Brigitte +4 more
Context. Solar jets are collimated plasma flows moving along magnetic field lines and are accelerated at low altitude following magnetic reconnection. Several of them originate from anemone-shaped low-lying arcades, and the most impulsive ones tend to be relatively wider and display untwisting motions.
Aims: We aim to establish typical behavi…
Observational study of intermittent solar jets: p-mode modulation
Liu, Yang; Cao, Wenda; Schmieder, Brigitte +7 more
Aims: Recurring jets are observed in the solar atmosphere. They can erupt intermittently over a long period of time. By the observation of intermittent jets, we wish to understand what causes the characteristics of the periodic eruptions.
Methods: We report intermittent jets observed by the Goode Solar Telescope (GST) with the TiO Broadb…
Transition region response to quiet-Sun Ellerman bombs
Joshi, Jayant; Rouppe van der Voort, Luc; Bhatnagar, Aditi
Context. Quiet-Sun Ellerman bombs (QSEBs) are key indicators of small-scale photospheric magnetic reconnection events. Recent high-resolution observations have shown that they are ubiquitous and that large numbers of QSEBs can be found in the quiet Sun. Aims. We aim to understand the impact of QSEBs on the upper solar atmosphere by analyzing their…
A magnetic reconnection model for the hot explosion with both ultraviolet and Hα wing emissions
Cheng, Guanchong; Ni, Lei; Chen, Yajie +1 more
Context. Ellerman bombs (EBs) with significant Hα wing emissions and ultraviolet bursts (UV bursts) with strong Si IV emissions are two kinds of small transient brightening events that occur in the low solar atmosphere. The statistical observational results indicate that about 20% of the UV bursts connect with EBs. While some promising models exis…
Effects of coronal rain on decayless kink oscillations of coronal loops
Antolin, Patrick; Pant, Vaibhav; Shrivastav, Arpit Kumar
Decayless kink oscillations are ubiquitously observed in active region coronal loops with an almost constant amplitude for several cycles. Decayless kink oscillations of coronal loops triggered by coronal rain have been analyzed, but the impact of coronal rain formation in an already oscillating loop is unclear. As kink oscillations can help diagn…
Mg II h&k spectra of an enhanced network region simulated with the MURaM-ChE code: Results using 1.5D synthesis
Solanki, S. K.; Leenaarts, J.; Cameron, R. +3 more
Context. The Mg II h&k lines are key diagnostics of the solar chromosphere. They are sensitive to the temperature, density, and nonthermal velocities in the chromosphere. The average Mg II h&k line profiles arising from previous 3D chromospheric simulations are too narrow compared to observations. Aims. We study the formation and properties of the…