V. Andretta
A5047785537- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Ionosphere and magnetosphere dynamics
- Astronomy and Astrophysical Research
- Solar Radiation and Photovoltaics
- Atmospheric Ozone and Climate
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- Geomagnetism and Paleomagnetism Studies
- Spacecraft and Cryogenic Technologies
- Gamma-ray bursts and supernovae
- Spacecraft Design and Technology
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
- History and Developments in Astronomy
- solar cell performance optimization
- CCD and CMOS Imaging Sensors
- Radiation Therapy and Dosimetry
- Atomic and Molecular Physics
- Inertial Sensor and Navigation
- Photocathodes and Microchannel Plates
- Magnetic confinement fusion research
- Infrared Target Detection Methodologies
National Institute for Astrophysics
2012-2024
Astronomical Observatory of Capodimonte
2015-2024
University of Naples Federico II
2023
Japan Aerospace Exploration Agency
2020
National Defense Academy of Japan
2020
Osservatorio Astrofisico di Torino
2015-2019
Institute of Space and Astronautical Science
2019
Nagoya University
2019
Arcetri Astrophysical Observatory
2013
Goddard Space Flight Center
1997-2000
Metis is the first solar coronagraph designed for a space mission capable of performing simultaneous imaging off-limb corona in both visible and UV light. The observations obtained with aboard Solar Orbiter ESA-NASA observatory will enable us to diagnose, unprecedented temporal coverage spatial resolution, structures dynamics full from 1.7 $R_\odot$ about 9 $R_\odot$. Due uniqueness profile, be able observe close vantage point (down 0.28 AU), achieving out-of-ecliptic views increase orbit...
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...
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...
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...
We investigate the formation of spectrum neutral helium in solar atmosphere by solving corresponding non-LTE problem an extended grid model atmospheres. From results we infer several general properties and scaling laws that can be used to discriminate different proposed mechanisms. Some have also been tested a comparison with previous calculations made assumptions.
The evolution of magnetic fields in Ap stars during the main sequence phase is presently mostly unconstrained by observation because difficulty assigning accurate ages to known field stars. We are carrying out a large survey cluster with goal obtaining sample these well-determined ages. In this paper we analyse information available from as it currently stands. select observational that probably (1) or association members and (2) For subsample determine fundamental parameters T_eff,...
Context.About 5% of upper main sequence stars are permeated by a strong magnetic field, the origin which is still matter debate.
Context. A small fraction of upper main sequence stars have strong, highly structured magnetic fields. The origin and evolution these fields are not adequately understood.
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...
Exoplanets orbiting very close to their host star are strongly irradiated. This can lead the upper atmospheric layers expand and evaporate into space. The metastable helium (HeI) triplet at 1083.3nm has recently been shown be a powerful diagnostic probe extended escaping exoplanetary atmosphere. We perform high-resolution transmission spectroscopy of transiting hot Jupiter HD189733b with GIARPS (GIANO-B + HARPS-N) observing mode Telescopio Nazionale Galileo, taking advantage simultaneous...
Abstract This paper describes the innovative optical design of Metis coronagraph for Solar Orbiter ESA-NASA mission. is a multi-wavelength, externally occulted telescope imaging solar corona in both visible and ultraviolet wavelength ranges. adopts novel occultation scheme disk, that we named “inverse external occulter”, reducing extremely high thermal load on instrument at spacecraft perihelion. The core an aplanatic Gregorian common to channels. A suitable dichroic beam-splitter, optimized...
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,...
Aims.We report on our analysis of the high resolution spectra () a sample 42 late-type active stars (with measured spanning from to ) acquired with Italian 3.6 m Telescopio Nazionale Galileo (TNG) using SARG spectrometer in 4960-10 110 Å range. The quality and good activity-level coverage allow us measure two different chromospheric indicators that can be derived Ca ii infrared triplet (Ca IRT) lines: residual equivalent width (EQW) indicator . aim this work is determine test best way...
METIS (Multi Element Telescope for Imaging and Spectroscopy) METIS, the "Multi Spectroscopy", is a coronagraph selected by European Space Agency to be part of payload Solar Orbiter mission launched in 2017. The profile will bring spacecraft as close Sun 0.3 A.U., up 35° out-of-ecliptic providing unique platform helio-synchronous observations its polar regions. designed multi-wavelength imaging spectroscopy solar corona. This presentation gives an overview innovative design elements...
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....
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...
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...
During a coordinated observing campaign (Solar and Heliospheric Observatory, SOHO JOP 139), we obtained simultaneous spectroheliograms of solar active region in several spectral lines, sampling levels from the chromosphere to corona. Ground-based were acquired at Dunn Solar Tower National Observatory/Sacramento Peak four chromospheric while coronal diagnostic spectrograph on board was used obtain rasters transition (TR) lines. Such complete data set allowed us compare development intensity...
METIS, the "Multi Element Telescope for Imaging and Spectroscopy", is a coronagraph selected by European Space Agency to be part of payload Solar Orbiter mission launched in 2017. The unique profile this will allow 1) close approach Sun (up 0.28 A.U.) thus leading significant improvement spatial resolution; 2) quasi co-rotation with Sun, resulting observations that nearly freeze several days large-scale outer corona plane sky 3) unprecedented out-of-ecliptic view solar corona. This paper...