Search Publications
Modeling the propagation of coronal mass ejections with COCONUT: Implementation of the regularized Biot-Savart law flux rope model
Schmieder, B.; Poedts, S.; Guo, Y. +8 more
Context. Coronal mass ejections (CMEs) are rapid eruptions of magnetized plasma that occur on the Sun. They are known to be the main drivers of adverse space weather. The accurate tracking of their evolution in the heliosphere in numerical models is of the utmost importance for space weather forecasting.
Aims: The main objective of this paper…
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…
3D evolution of a solar flare thermal X-ray loop-top source
Müller, D.; Nicula, B.; Krucker, S. +6 more
Context. The recent launch of Solar Orbiter has placed a solar X-ray imager (Spectrometer/Telescope for Imaging X-rays; STIX) beyond Earth orbit for the first time. This introduces the possibility of deriving the 3D locations and volumes of solar X-ray sources by combining STIX observations with those of Earth-orbiting instruments such as the Hino…
The relation between magnetic field inclination and the apparent motion of penumbral grains
Sobotka, Michal; Jurčák, Jan; Castellanos Durán, Juan Sebastián +1 more
Context. The bright heads of penumbral filaments, penumbral grains (PGs), show apparent horizontal motions inward, toward the umbra, or outward, away from the umbra.
Aims: We aim to ascertain statistically whether the direction of PGs' apparent motion is related to the inclination of the surrounding magnetic field.
Methods: We used spect…
Spatially resolved plasma composition evolution in a solar flare – The effect of reconnection outflow
Long, David M.; Brooks, David H.; Baker, Deborah +6 more
Context. Solar flares exhibit complex variations in elemental abundances compared to photospheric values. These abundance variations, characterized by the first ionization potential (FIP) bias, remain challenging to interpret. Aims. We aim to (1) examine the spatial and temporal evolution of coronal abundances in the X8.2 flare on 2017 September 1…
Properties of sunspot light bridges on a geometric height scale
Ruiz Cobo, B.; Asensio Ramos, A.; Esteban Pozuelo, S. +1 more
Context. Investigating light bridges (LBs) helps us comprehend key aspects of sunspots. However, few studies have analyzed the properties of LBs in terms of the geometric height, which is a more realistic perspective given the corrugation of the solar atmosphere. Aims. We aim to shed light on LBs by studying the variation in their physical propert…
The MODEST catalog of depth-dependent spatially coupled inversions of sunspots observed by Hinode/SOT-SP
Solanki, S. K.; Korpi-Lagg, A.; Castellanos Durán, J. S. +3 more
We present a catalog that contains depth-dependent information about the atmospheric conditions inside sunspot groups of all types. The catalog, which we named MODEST, is currently composed of 944 observations of 117 individual active regions with sunspots and covers all types of features observed in the solar photosphere. We used the SPINOR-2D co…
Solar internetwork magnetic fields: Statistical comparison between observations and MHD simulations
Borrero, J. M.; Ebert, E.; Milić, I.
Context. Although the magnetic fields in the quiet Sun account for the majority of the magnetic energy in the solar photosphere, inferring their exact spatial distribution, origin, and evolution poses an important challenge because the signals lie at the limit of today's instrumental precision. This severely hinders and biases our interpretations,…
Solar prominence diagnostics and their associated estimated errors from 1D NLTE Mg II h&k modelling
Barczynski, K.; Schmieder, B.; Labrosse, N. +1 more
Aims: We present further development of the rolling root mean square (rRMS) algorithm. These improvements consist of an increase in computational speed and an estimation of the uncertainty on the recovered diagnostics. This improved algorithm is named the cross root mean square (xRMS) algorithm.
Methods: We used the quantile method to re…