Yara De Leo
A5038561323- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Solar Radiation and Photovoltaics
- CCD and CMOS Imaging Sensors
- Spacecraft Design and Technology
- Earthquake Detection and Analysis
- Geomagnetism and Paleomagnetism Studies
- Adaptive optics and wavefront sensing
- solar cell performance optimization
- Calibration and Measurement Techniques
- Inertial Sensor and Navigation
- Atmospheric Ozone and Climate
- Spacecraft and Cryogenic Technologies
- Spacecraft Dynamics and Control
- Satellite Image Processing and Photogrammetry
- Dark Matter and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- History and Developments in Astronomy
- Infrared Target Detection Methodologies
- Magnetic confinement fusion research
- Geophysics and Gravity Measurements
- Radiation Therapy and Dosimetry
- Astronomy and Astrophysical Research
Max Planck Institute for Solar System Research
2020-2025
Istituto di Fotonica e Nanotecnologie
2023
University of Catania
2021-2023
Osservatorio Astrofisico di Catania
2020-2023
Astronomical Observatory of Capodimonte
2023
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,...
We present the results of in-flight radiometric calibration performed for ultraviolet (UV) Metis coronagraph on board Solar Orbiter. The is a fundamental procedure required to produce data in physical units. quantity that allows us pass from raw into calibrated factor rcf. To obtain results, we used observations stellar targets transiting field view. derived determining signal each star by means aperture photometry and evaluating its expected flux narrow bandpass ($121.6±10$;nm). analyzed...
The investigation of the wind in solar corona initiated with observations resonantly scattered UV emission coronal plasma obtained UVCS-SOHO, designed to measure outflow speed by applying Doppler dimming diagnostics. Metis on Solar Orbiter complements UVCS spectroscopic observations, performed during activity cycle 23, simultaneously imaging polarized visible light and HI Ly-alpha order obtain high-spatial temporal resolution maps outward velocity continuously expanding atmosphere. May 15,...
Abstract This Letter addresses the first Solar Orbiter (SO)–Parker Probe (PSP) quadrature, occurring on 2021 January 18 to investigate evolution of solar wind from extended corona inner heliosphere. Assuming ballistic propagation, same plasma volume observed remotely in at altitudes between 3.5 and 6.3 radii above limb with Metis coronagraph SO can be tracked PSP, orbiting 0.1 au, thus allowing local properties linked coronal source region where it originated. Thanks close approach PSP Sun...
Context. Ultraviolet (UV) emission from coronal mass ejections can provide information on the evolution of plasma dynamics, temperature, and elemental composition, as demonstrated by UV Coronagraph Spectrometer (UVCS) board SOlar Heliospheric Observatory (SOHO). Metis, coronagraph Solar Orbiter, provides for first time coronagraphic imaging in H I Ly- α line and, simultaneously, polarized visible light, thus providing a host properties solar eruptions such their overall evolution, content,...
Abstract This Letter reports the first observation of onset fully developed turbulence in solar corona. Long time series white-light coronal images, acquired by Metis aboard Solar Orbiter at 2 minutes cadence and spanning about 10 hr, were studied to gain insight into statistical properties fluctuations density plasma domain. From pixel-by-pixel spectral frequency analysis whole field view, scaling exponents derived. The results show that, over timescales ranging from 1 hr corresponding...
This study presents observations of a large pseudostreamer solar eruption and, in particular, the post-eruption relaxation phase, as captured by Metis onboard Solar Orbiter on October 12, 2022, during its perihelion passage. Utilizing total brightness data, we observe outward propagation helical features up to 3 radii along radial column that appears correspond stalk pseudostreamer. The structures persisted for more than hours following jet-like coronal mass ejection associated with polar...
On October 28, 2021 the first X-class solar flare of Solar Cycle 25 occurred in active region NOAA AR 12887 with a peak at 15:35 UT. It produced rare event ground-level enhancement relativistic proton flux and global extreme ultraviolet wave, along fast halo coronal mass ejection (CME) as seen from Earth's perspective. A few hours before flare, slower CME had erupted quiet Sun just behind northwestern limb. Orbiter was almost aligned Sun-Earth line and, during synoptic campaign, its...
Abstract This study presents observations of a large pseudostreamer solar eruption and, in particular, the post-eruption relaxation phase, as captured by Metis, on board Solar Orbiter, 2022 October 12, during its perihelion passage. Utilizing total-brightness data, we observe outward propagation helical features up to 3 radii along radial column that appears correspond stalk pseudostreamer. The structures persisted for more than hr following jet-like coronal mass ejection associated with...
Abstract Accurately determining the trajectory of coronal mass ejections (CMEs) is vital for space weather forecasting and assessing their potential impact on Earth. CMEs often deviate from a radial path, due to local pressure gradients or interactions with other CMEs. Combining coronagraphic heliospheric observations offers deeper insights into these phenomena, enhancing future prediction capabilities. On 2023 September 24, sequence four was observed by several spacecraft within 10 hr. This...
The slow solar wind belt in the quiet corona, observed with Metis coronagraph on board Solar Orbiter May 15, 2020, during activity minimum of cycle 24, a field view extending from 3.8 R⊙ to 7.0 R⊙, is formed by and dense stream running along coronal current sheet, accelerating radial direction reaching at 6.8 speed within 150 190 km s−1, depending assumptions velocity distribution neutral hydrogen atoms plasma. separated thin regions high shear faster streams, almost symmetric relative peak...
Context. The fast solar wind is known to emanate from polar coronal holes. Aims. This Letter reports the first estimate of expansion rate flows performed by Metis coronagraph on board Solar Orbiter. Methods. By exploiting simultaneous measurements in polarized white light and ultraviolet intensity neutral hydrogen Lyman- α line, it was possible extend observations outflow velocity main component holes out 5.5 R ⊙ , limit diagnostic applicability observational capabilities. Results. We...
Context. We present the results for in-flight radiometric calibration performed Visible Light (VL) channel of Metis coronagraph on board Solar Orbiter. Aims. The is a fundamental step in building official pipeline instrument, devoted to producing calibrated data physical units (L2 data). Methods. To obtain factor ( ϵ VL ), we used stellar targets transiting field view. derived by determining signal each star means aperture photometry and calculating its expected flux band pass. analyzed set...
Abstract This Letter reports the first observational estimate of heating rate in slowly expanding solar corona. The analysis exploits simultaneous remote and local observations same coronal plasma volume, with Solar Orbiter/Metis Parker Probe instruments, respectively, relies on basic wind magnetohydrodynamic equations. As expected, energy losses are a minor fraction flux, since most dissipation that feeds acceleration flow occurs much closer to Sun than heights probed present study, which...
Abstract The solar wind measured in situ by Parker Solar Probe the very inner heliosphere is studied combination with remote-sensing observation of coronal source region provided METIS coronagraph aboard Orbiter. outflows observed near ecliptic Metis on 2021 January 17 at 16:30 UT, between 3.5 and 6.3 R ⊙ above eastern limb, can be associated streams sampled PSP 0.11 0.26 au from Sun, two time intervals almost 5 days apart. plasma flows come distinct regions, characterized different magnetic...
Context. The Metis coronagraph on board Solar Orbiter offers a new view of coronal mass ejections (CMEs), observing them for the first time with simultaneous images acquired broad-band filter in visible-light interval and narrow-band around H I Ly- α line at 121.567 nm, so-called UV channel. Aims. We show observations CME, obtained 16 17 January 2021. event was also observed by EUI/FSI imager Orbiter, as well other space-based coronagraphs, such STEREO-A/COR2 SOHO/LASCO/C2, whose are...
Abstract This paper addresses the first direct investigation of energy budget in solar corona. Exploiting joint observations same coronal plasma by Parker Solar Probe and Metis coronagraph aboard Orbiter conserved equations for mass, magnetic flux, wave action, we estimate values all terms comprising total flux proton component slow wind from 6.3 to 13.3 R ⊙ . For distances Sun less than 7 , find that primary source is fluctuations including Alfvén waves. As flows away low corona, gradually...
Abstract For the first time evolution of coronal reconfiguration after a mass ejection (CME) was observed by multichannel Metis Coronagraph on board ESA–Solar Orbiter mission. The images acquired in visible light (VL) between 3.0 and 5.4 R ⊙ show formation CME bright elongated radial feature interpreted as post-CME current sheet (CS). unique combination VL UV allowed multiple plasma physical parameters inside outside CS region to be mapped 2D for time. electron temperature reached peak...
The Metis coronagraph is one of the remote sensing instruments hosted on board ESA/NASA Solar Orbiter mission. devoted to carry out first simultaneous imaging solar corona in both visible light (VL) and ultraviolet (UV). High-energy particles penetrate spacecraft materials may limit performance on-board instruments. A study galactic cosmic-ray (GCR) tracks observed VL images gathered by during commissioning phase for a total 60 seconds exposure time presented here. similar analysis planned...
Context. A few days before the first perihelion of Solar Orbiter nominal mission, which occurred on 2022 March 26, Metis coronagraph board detected a coronal mass ejection (CME) that was moving away from far side Sun (with respect to Orbiter) at high northern latitudes. The eruption also seen by other spacecraft, in particular, STEREO-A, quadrature configuration with Orbiter. Aims. We analyse different views CME constellation spacecraft purpose determine speed and acceleration CME, identify...
Abstract Metis on board Solar Orbiter is the space coronagraph developed by an Italian–German–Czech consortium. It capable of observing solar corona and various coronal structures in visible-light (VL) UV (hydrogen Ly α ) channels simultaneously for first time. Here we present observations a large eruptive prominence 2021 April 25–26, VL, taken during mission cruise phase, demonstrate that apart from broadband continuum emission, which due to Thomson scattering electrons, detect significant...
We present a new correlation method for deriving the F-corona intensity distribution, which is based on analysis of evolution total and polarized visible light (VL) images. studied one-month variation profiles brightness acquired with Large Angle Spectrometric COronagraph (LASCO-C2) found that in some regions they are highly correlated. Assuming does not vary significantly timescale one month, we estimated its high-correlation reconstructed corresponding maps both during solar-minimum...