D. Berghmans
A5006424990- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Ionosphere and magnetosphere dynamics
- Solar Radiation and Photovoltaics
- Spacecraft Design and Technology
- CCD and CMOS Imaging Sensors
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Calibration and Measurement Techniques
- Atmospheric Ozone and Climate
- Space exploration and regulation
- Distributed and Parallel Computing Systems
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Space Science and Extraterrestrial Life
- Magnetic confinement fusion research
- Photocathodes and Microchannel Plates
- Planetary Science and Exploration
- Infrared Target Detection Methodologies
- Earthquake Detection and Analysis
- History and Developments in Astronomy
- Photovoltaic System Optimization Techniques
- Astronomical Observations and Instrumentation
- Non-Destructive Testing Techniques
Royal Observatory of Belgium
2015-2024
Purple Mountain Observatory
2007
Max Planck Institute for Solar System Research
2004
Max Planck Society
2004
European Space Research and Technology Centre
2002
Fund for Scientific Research
1996
KU Leuven
1996
Context. The Extreme Ultraviolet Imager (EUI) is part of the remote sensing instrument package ESA/NASA Solar Orbiter mission that will explore inner heliosphere and observe Sun from vantage points close to out ecliptic. advance “connection science” between solar activity heliosphere. Aims. With EUI we aim improve our understanding structure dynamics atmosphere, globally as well at high resolution, latitude perspectives. Methods. consists three telescopes, Full two High Resolution Imagers,...
The goal of this paper is to study the smallest brightening events observed in EUV quiet Sun. We use commissioning data taken by EUI instrument onboard recently launched Solar Orbiter mission. On 2020 May 30, was situated at 0.556AU from Its HRIEUV telescope 17.4nm passband reached an exceptionally high two-pixel spatial resolution 400km. size and duration small-scale structures determined data, while their height estimated triangulation with simultaneous SDO/AIA data. This first stereoscopy...
We address the question whether properties of observed latitude-time diagram sunspot occurrence (the butterfly diagram) provide evidence for operation a flux-transport dynamo, which explains migration zones and period solar cycle in terms deep equatorward meridional flow.We show that are equally well reproduced by conventional dynamo model with migrating waves, but without transport magnetic flux flow.These seem to be generic an oscillatory migratory field dipole parity thus do not permit...
In this paper, we present the first automatically constructed LASCO coronal mass ejection (CME) catalog, a result of application Computer Aided CME Tracking software (CACTus) on archive during interval 1997 September–2007 January. We have studied characteristics and compared them with similar results obtained by manual detection (CDAW catalog). On average, CACTus detects less than two events per day solar minimum, up to eight maximum, nearly half being narrow (<20°). Assuming correction...
Context. Solar observatories are providing the world-wide community with a wealth of data, covering wide time ranges (e.g. and Heliospheric Observatory, SOHO), multiple viewpoints (Solar TErrestrial RElations STEREO), returning large amounts data Dynamics SDO). In particular, volume SDO presents challenges; available only from few repositories, full-disk, full-cadence for reasonable durations scientific interest difficult to download, due their size download rates most users. From...
Solar Orbiter is the first space mission observing solar plasma both in situ and remotely, from a close distance, out of ecliptic. The ultimate goal to understand how Sun produces controls heliosphere, filling System driving planetary environments. With six remote-sensing four in-situ instrument suites, coordination planning operations are essential address following top-level science questions: (1) What drives wind where does coronal magnetic field originate? (2) How do transients drive...
Context. Recent observations by the Extreme Ultraviolet Imager (EUI) on board Solar Orbiter have characterized prevalent small-scale transient brightenings in corona above quiet Sun termed campfires. Aims. In this study we search for comparable a numerical model and then investigate their relation to magnetic field processes that drive these events. Methods. We use MURaM code solve 3D radiation MHD equations box stretches from upper convection zone corona. The self-consistently produces...
The European Solar Telescope (EST) is a project aimed at studying the magnetic connectivity of solar atmosphere, from deep photosphere to upper chromosphere. Its design combines knowledge and expertise gathered by physics community during construction operation state-of-the-art telescopes operating in visible near-infrared wavelengths: Swedish 1m (SST), German Vacuum Tower (VTT) GREGOR, French T\'elescope H\'eliographique pour l'\'Etude du Magn\'etisme et des Instabilit\'es Solaires...
Switchbacks are sudden, large radial deflections of the solar wind magnetic field, widely revealed in interplanetary space by Parker Solar Probe. The switchbacks' formation mechanism and sources still unresolved, although candidate mechanisms include Alfv\'enic turbulence, shear-driven Kelvin-Helmholtz instabilities, interchange reconnection, geometrical effects related to spiral. This Letter presents observations from Metis coronagraph onboard Orbiter a single propagating S-shaped vortex,...
Coronal holes are areas on the Sun with open magnetic field lines. They a source region of solar wind, but how wind emerges from coronal is not known. We observed hole using Extreme Ultraviolet Imager Solar Orbiter spacecraft. identified jets scales few hundred kilometers, which last 20 to 100 seconds and reach speeds ~100 kilometers per second. The powered by reconnection have kinetic energy in picoflare range. intermittent widespread within hole. suggest that such could produce enough...
Abstract Magnetic reconnection is a key mechanism involved in solar eruptions and also prime possibility to heat the low corona millions of degrees. Here, we present ultra-high-resolution extreme ultraviolet observations persistent null-point at scale about 390 km over one hour Extreme-Ultraviolet Imager on board Solar Orbiter spacecraft. The show formation configuration above minor positive polarity embedded within region dominant negative near sunspot. gentle phase evidenced by sustained...
Solar wind, classified by its bulk speed and the Alfvénic nature of fluctuations, generates heliosphere. The elusive physical processes responsible for generation different types this wind are a topic active debate. Recent observations reveal intermittent jets, with kinetic energy in picoflare range, emerging from dark areas polar coronal hole threaded open magnetic field lines. These could substantially contribute to solar wind. However, their ubiquity direct links have not been...
On May 13, 1998 the EIT (Extreme ultraviolet Imaging Telescope) on board of SoHO (Solar and Heliospheric Observatory) TRACE (Transition Region And Coronal Explorer) instruments produced simultaneous high cadence image sequences same active region (AR 8218). achieved a 25 s in Feix (171 Å) bandpass while 15 (operating "shutterless mode", JOP 80) Fexii (195 bandpass. These observations two complementary wavelengths have revealed existence weak transient disturbances an extended coronal loop...
Context. The Solar Orbiter spacecraft will be equipped with a wide range of remote-sensing (RS) and in situ (IS) instruments to record novel unprecedented measurements the solar atmosphere inner heliosphere. To take full advantage these new datasets, tools techniques must developed ease multi-instrument multi-spacecraft studies. In particular currently inaccessible low corona below two radii can only observed remotely. Furthermore used retrieve coronal plasma properties time three...
Solar campfires are fine-scale heating events, recently observed by Extreme Ultraviolet Imager (EUI), onboard Orbiter. Here we use EUI 174\AA\ images, together with EUV images from SDO/AIA, and line-of-sight magnetograms SDO/HMI to investigate the magnetic origin of 52 randomly selected in quiet solar corona. We find that (i) rooted at edges photospheric network lanes; (ii) most reside above neutral line between majority-polarity flux patch a merging minority-polarity patch, cancelation rate...
This paper presents a review on the PECASUS service, which provides advisories enhanced space weather activity for civil aviation. The are tailored according to Standards and Recommended Practices of International Civil Aviation Organization (ICAO). Advisories disseminated in three impact areas: radiation levels at flight altitudes, GNSS-based navigation positioning, HF communication. review, is based experiences authors from two years running pilot ICAO services, describes empirical models...
Relaxation of braided coronal magnetic fields through reconnection is thought to be a source energy heat plasma in active region loops. However, observations heating associated with an untangling braids remain sparse. One reason for this paucity could the lack sufficiently high spatial and temporal resolution capture process action. Using new (250-270 km on Sun) cadence (3-10 s) from Extreme Ultraviolet Imager (EUI) board Solar Orbiter, we observed small-scale different regions. The...
Abstract High-frequency wave phenomena present a great deal of interest as one the possible candidates to contribute energy input required heat corona part alternating current heating theory. However, resolution imaging instruments up until Solar Orbiter has made it impossible resolve necessary time and spatial scales. The paper reports on high-frequency transverse motions in small loop located quiet-Sun region corona. oscillations were observed with High Resolution Imager Extreme...
Context. The Extreme Ultraviolet Imager (EUI), onboard Solar Orbiter consists of three telescopes: the two High Resolution Imagers in EUV (HRIEUV) and Lyman-{\alpha} (HRILya), Full Sun (FSI). Orbiter/EUI started its Nominal Mission Phase on 2021 November 27. Aims. EUI images from largest scales extended corona off limb, down to smallest features at base chromosphere. is therefore a key instrument for connection science that heart mission goals. Methods. highest resolution achieved when...