A5041831078- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Solar Radiation and Photovoltaics
- Physics of Superconductivity and Magnetism
- Geophysics and Gravity Measurements
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Magnetic properties of thin films
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Radio Astronomy Observations and Technology
- Earthquake Detection and Analysis
- Atmospheric Ozone and Climate
- Astrophysics and Cosmic Phenomena
- Spacecraft Design and Technology
- CCD and CMOS Imaging Sensors
- Quantum, superfluid, helium dynamics
- History and Developments in Astronomy
- High-pressure geophysics and materials
- Atomic and Subatomic Physics Research
- Superconductivity in MgB2 and Alloys
- Superconducting Materials and Applications
Osservatorio Astrofisico di Catania
2016-2025
Brera Astronomical Observatory
2025
National Institute for Astrophysics
2007-2024
Istituto di Fotonica e Nanotecnologie
2021-2023
University of Campania "Luigi Vanvitelli"
1995-2023
Osservatorio Astrofisico di Torino
2021-2022
Astronomical Observatory of Capodimonte
2021
University of Florence
2021
Jet Propulsion Laboratory
2021
University of Sannio
2003-2009
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...
Solar filaments are magnetic structures often observed in the solar atmosphere and consist of plasma that is cooler denser than their surroundings. They visible for days -- even weeks which suggests they equilibrium with environment before disappearing or erupting. Several eruption models have been proposed aim to reveal what mechanism causes (or triggers) these eruptions. Validating through observations represents a fundamental step our understanding We present an analysis observation...
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 Several recurrent X-class flares from Active Region (AR) 13664 triggered a severe G5-class geomagnetic storm between 2024 May 10 and 11. The morphology compactness of this AR closely resemble the responsible for famous Carrington Event 1859. Although induced currents produced value Dst index, probably 1 order magnitude weaker than that Event, characteristics warrant special attention. Understanding mechanisms magnetic field emergence transformation in solar atmosphere lead to...
We describe the evolution of magnetic and velocity fields in annular zone around a pore few hours before formation its penumbra. detected presence several patches at edge zone, with typical size about 1''. These are characterized by rather vertical field polarity opposite to that pore. They correspond regions plasma upflow up 2.5 km s−1 radially outward displacements horizontal velocities 2 s−1. interpret these features as portions lines returning beneath photosphere being progressively...
We studied the variations of line-of-sight photospheric plasma flows during formation phase penumbra around a pore in Active Region NOAA 11490. used high spatial, spectral, and temporal resolution data set acquired by Interferometric BIdimensional Spectrometer (IBIS) operating at NSO/Dunn Solar Telescope as well taken Helioseismic Magnetic Imager onboard Dynamics Observatory satellite (SDO/HMI). Before formed we observed redshift spectral line inner part annular zone surrounding blueshift...
Context. Flares and coronal mass ejections (CMEs) are solar phenomena that not yet fully understood. Several investigations have been performed to single out their related physical parameters can be used as indices of the magnetic complexity leading occurrence.
Abstract We describe the peculiarity of two recurrent white light flares that occurred on 2017 September 06, in super active region NOAA 12673, with a time interval, between their peaks, about 3 hr. These events X2.2 and X9.3 GOES classes are very important, not only for high level emission visible effects lower layers solar atmosphere, which discernible as clear ribbons, but also strong horizontal photospheric motions, seemed to drive them. In fact, we observed displacement negative umbra...
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 magnetic nature of the formation solar active regions lies at heart understanding activity and, in particular, eruptions. A widespread model, used many theoretical studies, simulations and interpretation observations, is that basic structure an region created by emergence a large tube pre-twisted field. Despite plausible reasons availability various proxies suggesting accuracy this there has not yet been methodology can clearly directly identify flux tubes. Here, we present clear...
The Solar Activity Magnetic Monitor (SAMM) Network (SAMNet) is a future UK-led international network of ground-based solar telescope stations. SAMNet, at its full capacity, will continuously monitor the Sun’s intensity, magnetic, and Doppler velocity fields multiple heights in atmosphere (from photosphere to upper chromosphere). Each SAMM sentinel be equipped with cluster identical telescopes each different magneto-optical filter (MOFs) take observations K I, Na D, Ca I spectral bands. A...
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...
Context. Full-disc observations of the Sun in H α line provide information about solar chromosphere, and particular, filaments, which are dark elongated features that lie along magnetic field polarity-inversion lines. This makes them important for studies magnetism. Because full-disc have been performed at various sites since second half 19th century, with regular photographic data having started beginning 20th they an invaluable source on past Aims. We derive accurate filaments from...
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...
Bipolar emerging flux regions (EFRs) form active (ARs) that generally evolve into a pre-existing magnetic environment in the solar atmosphere. Reconfiguration of small- and large-scale connectivities is invoked to explain plethora energy-release phenomena observed at sites EFRs. These include brightening events, surges, jets, whose triggers relationships are still unclear. In this context, we study formation proto-spot AR NOAA 11462 by analyzing spectropolarimetric spectroscopic measurements...
Context. It is now possible to distinguish between two main models describing the mechanisms responsible for eruptive flares : standard model, which assumes that most of energy released, by magnetic reconnection, in region hosting core a sheared field, and breakout reconnection occurs at first arcade overlaying features.
We present results from the analysis of high-resolution spectropolarimetric and spectroscopic observations solar photosphere chromosphere, obtained shortly before formation a penumbra in one leading polarity sunspots NOAA active region 11490. The were performed at Dunn Solar Telescope National Observatory on 2012 May 28, using Interferometric Bidimensional Spectrometer. data set is comprised 1 hr time sequence measurements Fe i 617.3 nm 630.25 lines (full Stokes polarimetry) Ca ii 854.2 line...
We describe the evolution and magnetic helicity flux for two active regions (ARs) since their appearance on solar disk: NOAA 11318 11675. Both ARs hosted formation destabilization of ropes. In former AR, rope culminated in a flare C2.3 GOES class coronal mass ejection (CME) observed by Large Angle Spectrometric Coronagraph Experiment. latter region hosting was involved several flares, but only partial eruption with signatures minor plasma outflow observed. found different behavior...
Abstract On 2013 June 21, a solar prominence eruption was observed, accompanied by an M2.9 class flare, fast coronal mass ejection, and type II radio burst. The concomitant emission of energetic particles (SEPs) produced significant proton flux increase, in the energy range 4–100 MeV, measured Low High Energy Telescopes on board Solar TErrestrial RElations Observatory (STEREO)-B spacecraft. Only small enhancements, at lower energies, were observed STEREO-A Geostationary Operational...