Search Publications
Solar flare hard X-rays from the anchor points of an eruptive filament
Volpara, Anna; Massa, Paolo; Krucker, Säm +7 more
Context. We present an analysis of a GOES M1.8 flare with excellent observational coverage in UV, extreme-UV (EUV), and X-ray, including observations from the Interface Region Imaging Spectrograph (IRIS), from the Solar Dynamics Observatory (SDO) with the Atmospheric Imaging Assembly (AIA), from the Hinode/EUV Imaging Spectrometer (EIS), from the …
A multiple spacecraft detection of the 2 April 2022 M-class flare and filament eruption during the first close Solar Orbiter perihelion
Williams, D.; Woch, J.; Barczynski, K. +56 more
Context. The Solar Orbiter mission completed its first remote-sensing observation windows in the spring of 2022. On 2 April 2022, an M-class flare followed by a filament eruption was seen both by the instruments on board the mission and from several observatories in Earth's orbit, providing an unprecedented view of a flaring region with a large ra…
Small-scale EUV features as the drivers of coronal upflows in the quiet Sun
Teriaca, Luca; Long, David M.; Schühle, Udo +18 more
Context. Coronal upflows in the quiet Sun are seen in a wide range of features, including jets and filament eruptions. The in situ measurements from Parker Solar Probe within ≈0.2 au have demonstrated that the solar wind is highly structured, showing abrupt and near-ubiquitous magnetic field reversals (i.e., switchbacks) on different timescales. T…
Five-minute oscillations of photospheric and chromospheric swirls
Liu, Jiajia; Mathioudakis, Mihalis; Erdélyi, Robert +1 more
Context. Swirls are ubiquitous in the solar atmosphere. They are thought to be related to the excitation of different modes of magnetohydrodynamic waves and pulses, as well as spicules. However, statistical studies of their collective behaviour are rare.
Aims: We aim to study the collective as well as the individual behaviour of photospheric …
Slow solar wind sources. High-resolution observations with a quadrature view
Teriaca, Luca; Long, David M.; Schühle, Udo +16 more
Context. The origin of the slow solar wind is still an open issue. One possibility that has been suggested is that upflows at the edge of an active region can contribute to the slow solar wind.
Aims: We aim to explain how the plasma upflows are generated, which mechanisms are responsible for them, and what the upflow region topology looks lik…
Temporal and spatial association between microwaves and type III bursts in the upper corona
Reid, H.; Altyntsev, A. T.; Meshalkina, N. S. +2 more
One of the most important tasks in solar physics is the study of particles and energy transfer from the lower corona to the outer layers of the solar atmosphere. The most sensitive methods for detecting fluxes of non-thermal electrons in the solar atmosphere is observing their radio emission using modern large radioheliographs. We analyzed joint o…
The source of unusual coronal upflows with photospheric abundance in a solar active region
Barczynski, K.; Peter, H.; Zhukov, A. N. +21 more
Context. Upflows in the corona are of importance, as they may contribute to the solar wind. There has been considerable interest in upflows from active regions (ARs). The coronal upflows that are seen at the edges of active regions have coronal elemental composition and can contribute to the slow solar wind. The sources of the upflows have been ch…
Rotational radial shear in the low solar photosphere
Corbard, T.; Faurobert, M.; Gelly, B. +2 more
Context. Radial differential rotation is an important physical ingredient in stellar dynamo theory. In the case of the Sun, heliosismology techniques have revealed the existence of a near-surface shear layer covering 15-20% of the upper convection zone. It was recently shown that the rotation velocity gradient is not uniform in this layer and that…