S. Parenti
A5000899373- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Ionosphere and magnetosphere dynamics
- Solar Radiation and Photovoltaics
- Geophysics and Gravity Measurements
- CCD and CMOS Imaging Sensors
- Geomagnetism and Paleomagnetism Studies
- Spacecraft Design and Technology
- History and Developments in Astronomy
- Photocathodes and Microchannel Plates
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Laser-induced spectroscopy and plasma
- Calibration and Measurement Techniques
- Gamma-ray bursts and supernovae
- Plasma Diagnostics and Applications
- Distributed and Parallel Computing Systems
- Atmospheric Ozone and Climate
- Magnetic confinement fusion research
- Astronomy and Astrophysical Research
- Planetary Science and Exploration
- Spacecraft and Cryogenic Technologies
- Inertial Sensor and Navigation
- Space exploration and regulation
Centre National de la Recherche Scientifique
2005-2024
Institut d'Astrophysique Spatiale
2006-2024
Université Paris-Saclay
2017-2024
Royal Observatory of Belgium
2008-2023
Université Paris-Sud
2003-2022
CEA Paris-Saclay
2021
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2021
Astrophysique, Instrumentation et Modélisation
2021
Université Toulouse III - Paul Sabatier
2019
Université de Toulouse
2019
Solar prominences are one of the most common features solar atmosphere. They found in corona but they hundred times cooler and denser than coronal material, indicating that thermally pressure isolated from surrounding environment. Because these properties appear at limb as bright when observed optical or EUV cool lines. On disk darker their background, presence a plasma absorption process (in this case called filaments). Prominence is embedded magnetic environment lies above inversion lines,...
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...
The Spectral Imaging of the Coronal Environment (SPICE) instrument is a high-resolution imaging spectrometer operating at extreme ultraviolet (EUV) wavelengths. In this paper, we present concept, design, and pre-launch performance facility on ESA/NASA Solar Orbiter mission. goal paper to give prospective users better understanding possible types observations, data acquisition, sources that contribute instrument's signal. discusses science objectives, with focus SPICE-specific aspects, before...
The Daniel K. Inouye Solar Telescope (DKIST) will revolutionize our ability to measure, understand and model the basic physical processes that control structure dynamics of Sun its atmosphere. first-light DKIST images, released publicly on 29 January 2020, only hint at extraordinary capabilities which accompany full commissioning five facility instruments. With this Critical Science Plan (CSP) we attempt anticipate some what those enable, providing a snapshot scientific pursuits hopes engage...
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...
Nanoflares, short and intense heat pulses within spatially unresolved magnetic strands, are now considered a leading candidate to solve the coronal heating problem. However, frequent occurrence of nanoflares requires that flare-hot plasma be present in corona at all times. Its detection has proved elusive until now, part because intensities predicted very faint. Here we report on analysis an active region observed with five filters by Hinode/XRT November 2006. We have used filter ratio...
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...
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...
Context. Solar Orbiter is a new space observatory that provides unique capabilities to understand the heliosphere. In particular, it has made several observations of far-side Sun and therefore information can greatly improve weather monitoring. Aims. this study, we aim quantify how data will affect simulations corona interplanetary medium, especially in context forecasting. Methods. To do so, focused on time period with single sunspot emerging February 2021. We used two different input...
The prominence–corona transition region (PCTR) plays a key role in the thermal and pressure equilibrium of solar prominences. Our knowledge this interface is limited several major issues remain open, including structure and, particular, maximum temperature detectable plasma. high signal-to-noise ratio images obtained by Atmospheric Imaging Assembly (AIA) on NASA's Solar Dynamics Observatory clearly shows that prominences are often seen emission 171 131 bands. We investigate sensitivity these...
We study here the phenomena of decayless kink oscillations in a system active region (AR) coronal loops. Using high resolution observations from two different instruments, namely Extreme Ultraviolet Imager (EUI) on board Solar Orbiter and Atmospheric Imaging Assembly (AIA) Dynamics Observatory, we follow these AR loops for an hour each three consecutive days. Our results show significantly more resolved waves higher-resolution EUI data compared with AIA data. Furthermore, same exhibits many...
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...
Context. Torsional Alfvén waves do not produce any intensity variation and are therefore challenging to observe with imaging instruments. Previously, wave observations were reported throughout all the layers of solar atmosphere using spectral imaging. Aims. We present a torsional detected in an inverted Y-shaped structure observed HRIEUV telescope EUI instrument on board Solar Orbiter its 174 Å channel. The feature consists two footpoints connected through short loops spine length 30 mm...
In this paper, the ability of Hinode/EIS instrument to detect radiative signatures coronal heating is investigated. Recent observational studies active region cores suggest that both low and high frequency mechanisms are consistent with observations. Distinguishing between these possibilities important for identifying physical mechanism(s) heating. The differential emission measure (DEM) tool one diagnostic allows us make distinction, through amplitude DEM slope coolward peak. It therefore...
The Differential Emission Measure (DEM) analysis is one of the most used diagnostic tools for solar and stellar coronae. Being an inverse problem, it has limitations due to presence random systematic errors. We present in theses series papers robustness inversion case AIA/SDO observations. completely characterize DEM its statistical properties, providing all solutions consistent with data along their associated probabilities, a test suitability assumed model. While Paper I focused on...
Context. To meet the scientific objectives of mission, Solar Orbiter spacecraft carries a suite in-situ (IS) and remote sensing (RS) instruments designed for joint operations with inter-instrument communication capabilities. Indeed, previous missions have shown that Sun (imaged by RS instruments) heliosphere (mainly sampled IS should be considered as an integrated system rather than separate entities. Many advances expected from rely on this synergistic approach between measurements. Aims....
The 3D fine structure of the solar atmosphere is still not fully understood as most available observations are taken from a single vantage point. goal paper to study distribution small-scale brightening events ("campfires") discovered in EUV quiet Sun by Extreme Ultraviolet Imager (EUI) aboard Solar Orbiter. We used first commissioning data set acquired EUI's High Resolution telescope on 30 May 2020 174 {\AA} passband and we combined it with simultaneous Atmospheric Imaging Assembly (AIA)...
Context. Solar Orbiter and PSP jointly observed the solar wind for first time in June 2020, capturing data from very different streams, calm Alfv\'enic as well many dynamic structures. Aims. The aim here is to understand origin characteristics of highly by two probes, particular vicinity heliospheric current sheet (HCS). Methods. We analyse plasma obtained situ during month 2020. use Alfv\'en-wave turbulence MHD model WindPredict-AW, perform 3D simulations based on ADAPT magnetograms this...
We report observations of a unique, large prominence eruption that was observed in the He II 304 {\AA} passband Extreme Ultraviolet Imager/Full Sun Imager telescope aboard Solar Orbiter on 15-16 February 2022. Observations from several vantage points (Solar Orbiter, Solar-Terrestrial Relations Observatory, and Heliospheric Earth-orbiting satellites) were used to measure kinematics erupting associated coronal mass ejection. Three-dimensional reconstruction calculate deprojected positions...
Plasma upflows with a Doppler shift exceeding 20 km/s at active region (AR) boundaries are considered potential sources of nascent slow solar wind.  These often located the footpoints large-scale fan-like loops, showing temperature-dependent shifts from transition to lower corona. In this study, we identified two upflow regions in vicinity an by analyzing blueshifts Fe XII 195 line observed Hinode/EIS. Context images for were obtained High Resolution Imager (HRI) telescope Extreme...
Context.A solar prominence and the quiet-Sun (QS) were observed with SOHO/SUMER in October 1999. With this dataset we built first comprehensive UV spectral atlas range 800–1250 Å for a prominence, thus complementing existing reference atlases QS.