S. Giordano
A5068234531- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Particle accelerators and beam dynamics
- Atmospheric Ozone and Climate
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Particle Accelerators and Free-Electron Lasers
- Solar Radiation and Photovoltaics
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Magnetic confinement fusion research
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Laser-induced spectroscopy and plasma
- Planetary Science and Exploration
- Physics of Superconductivity and Magnetism
- Astronomical Observations and Instrumentation
- Earthquake Detection and Analysis
- Adaptive optics and wavefront sensing
- Advanced Frequency and Time Standards
- Atmospheric aerosols and clouds
- Radiation Therapy and Dosimetry
- Antenna Design and Optimization
Osservatorio Astrofisico di Torino
2015-2024
National Institute for Astrophysics
2008-2024
University of Turin
1995-2022
University of Genoa
2002-2015
Centrum Badań Kosmicznych
2013
University of Rome Tor Vergata
2006-2012
Altran (France)
2012
Catholic University of America
2010
Goddard Space Flight Center
2010
Istituto Nazionale di Fisica Nucleare
2005
We present a self-consistent empirical model for several plasma parameters of polar coronal hole near solar minimum, derived from observations with the Solar and Heliospheric Observatory Ultraviolet Coronagraph Spectrometer. The describes radial distribution density electrons, H0, O5 + outflow velocity unresolved most probable velocities H0 during period between 1996 November 1997 April. In this Letter, we compare H I Lyα O VI λλ1032, 1037 emission lines spatial models parameters, iterate...
We present a comprehensive and self-consistent empirical model for several plasma parameters in the extended solar corona above polar coronal hole. The is derived from observations with SOHO Ultraviolet Coronagraph Spectrometer (UVCS/SOHO) during period between 1996 November 1997 April. compare of H I Lyα O VI λλ1032, 1037 emission lines detailed three-dimensional models iterate optimal consistency measured synthesized observable quantities. Empirical constraints are obtained radial...
This review addresses our current understanding of comets that venture close to the Sun, and are hence exposed much more extreme conditions than typically studied from Earth. The solar heating plasma environments these objects encounter change many aspects their behaviour, thus yielding valuable information on both themselves complements other data we have primitive system bodies, as well near-solar environment which they traverse. We propose clear definitions for comets: use term near-Sun...
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,...
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...
ESA/NASA's Solar Orbiter (SO) allows us to study the solar corona at closer distances and from different perspectives, which helps gain significant insights into origins of wind. In this work, we present analysis wind outflows two locations: a narrow open-field corridor small, mid-latitude coronal hole. These were observed off-limb by Metis coronagraph onboard SO on-disk Extreme Ultraviolet Imaging Spectrometer (EIS) Hinode. Magnetic field extrapolations suggest that upflow regions seen in...
This presentation outlines the Doppler dimming diagnostic method, computational tools developed, and solar wind speed maps derived from Metis data spanning a wide range of heliocentric distances, approximately 1.5 to 10 radii, during activity minimum.The diagnostic, which combine simultaneous observations its two channels, polarized broadband visible light narrowband ultraviolet H I Lyα intensity, allows for measurement expanding coronal plasma speed. The presented are obtained sets...
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...
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...
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...
The present spectroscopic study of the ultraviolet coronal emission in a polar hole, detected on 1996 April 6-9 with Ultraviolet Coronagraph Spectrometer aboard Solar and Heliospheric Observatory spacecraft, identifies interplume lanes background hole regions as channels which fast solar wind is preferentially accelerated. In lanes, at heliocentric distance 1.7 R middle dot circle, corona expands rate between 105 150 km s-1, that is, much faster than plumes outflow velocity 0 65 s-1....
Accelerating polarized protons to 22 GeV/c at the Brookhaven Alternating Gradient Synchro- tron required both extensive hardware modifications and a difficult commissioning process. We had overcome 45 strong depolarizing resonances maintain polarization up in this strong-focusing synchrotron. At 18.5 we measured analyzing power A spin-spin correlation parameter Ann large- P2⊥ proton-proton elastic scattering, using proton beam target. also obtained high-precision measurement of P2⊥=0.3...
We investigated the capability of mapping solar wind outflow velocity neutral hydrogen atoms by using synergistic visible-light and ultraviolet observations. used polarised brightness images acquired LASCO/SOHO Mk3/MLSO coronagraphs, synoptic Ly α line observations UVCS/SOHO spectrometer to obtain daily maps H I between 1.5 4.0 R ⊙ on SOHO plane sky during a complete rotation (from 1997 June 1 28). The 28-days data sequence allows us construct coronal off-limb Carrington resulting velocities...
Abstract This paper reports the first possible evidence for development of Kelvin–Helmholtz (KH) instability at border coronal holes separating associated fast wind from slower originating adjacent streamer regions. Based on a statistical data set spectroscopic measurements UV corona acquired with UltraViolet Coronagraph Spectrometer board SOlar and Heliospheric Observatory during minimum activity solar cycle 22, high temperature–velocity correlations are found along fast/slow interface...
Abstract Multiple neural network architectures, with different structural composition and complexity, are implemented in this study the aim of providing multi-hour-ahead warnings severe geomagnetic disturbances, based on situ measurements solar wind plasma magnetic field acquired at Lagrangian point L1. First, a statistical analysis interplanetary data was performed to out which most relevant parameters be provided as input networks, preprocessing set face its heavy imbalance (the Earth’s...
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...