Preliminary surface charging analysis of Ariel payload dielectrics in early transfer orbit and L2-relevant space environment

Ariel [1] is the M4 mission of the ESA’s Cosmic Vision Program 2015-2025, whose aim is to characterize by lowresolution transit spectroscopy the atmospheres of over one thousand warm and hot exoplanets orbiting nearby stars. The operational orbit of the spacecraft is baselined as a large amplitude halo orbit around the Sun-Earth L2 Lagrangian point, as it offers the possibility of long uninterrupted observations in a fairly stable radiative and thermo-mechanical environment. A direct escape injection with a single passage through the Earth radiation belts and no eclipses is foreseen. The space environment around Earth and L2 presents significant design challenges to all spacecraft, including the effects of interactions with Sun radiation and charged particles owning to the surrounding plasma environment, potentially leading to dielectrics charging and unwanted electrostatic discharge (ESD) phenomena endangering the Payload operations and its data integrity. Here, we present some preliminary simulations and analyses about the Ariel Payload dielectrics and semiconductors charging along the transfer orbit from launch to L2 include

Enabling planetary science across light-years. Ariel Definition Study Report

Ariel, the Atmospheric Remote-sensing Infrared Exoplanet Large-survey, was adopted as the fourth medium-class mission in ESA's Cosmic Vision programme to be launched in 2029. During its 4-year mission, Ariel will study what exoplanets are made of, how they formed and how they evolve, by surveying a diverse sample of about 1000 extrasolar planets, simultaneously in visible and infrared wavelengths. It is the first mission dedicated to measuring the chemical composition and thermal structures of hundreds of transiting exoplanets, enabling planetary science far beyond the boundaries of the Solar System. The payload consists of an off-axis Cassegrain telescope (primary mirror 1100 mm x 730 mm ellipse) and two separate instruments (FGS and AIRS) covering simultaneously 0.5-7.8 micron spectral range. The satellite is best placed into an L2 orbit to maximise the thermal stability and the field of regard. The payload module is passively cooled via a series of V-Groove radiators; the detectors for the AIRS are the only items that require active cooling via an active Ne JT cooler. The Ariel payload is developed by a consortium of more than 50 institutes from 16 ESA countries, which include the UK, France, Italy, Belgium, Poland, Spain, Austria, Denmark, Ireland, Portugal, Czech Republic, Hungary, the Netherlands, Sweden, Norway, Estonia, and a NASA contribution

'I crocevia dell'Umanesimo e le Marche'. XXX Congresso Internazionale di Studi Umanistici (Sassoferrato, 1-4 luglio 2009)

Cronaca del Congresso Internazionale, in stampa su «Rassegna Storica Salernitana

Historiographie et rhétorique épidictique dans les Feretrana, recueil d’épigrammes biographiques de Giovambattista Cantalicio

Giovambattista Valentini, dit Cantalicio en l’honneur de sa patrie Cantalice, est un auteur complexe et injustement négligé dans le panorama intellectuel de l’Humanisme italien : il vécut d’environ 1445 à 1516 et la plupart de ses œuvres poétiques et érudites, comme souvent pour la littérature néolatine, sont encore inédites. Cantalicio incarne bien l’intellectuel de la Renaissance italienne. D’un côté, la passion pour les humanae litterae, dont témoignent ses commentaires des classiques tels..

'Pomponio Leto: tra identità locale e cultura internazionale'. Convegno Internazionale: Teggiano 3-5 ottobre 2008

Cronaca del Convegno Internazionale di Studi, edita in «Bollettino di Studi Latini

Rassegna storica salernitana. N.s. A. 26, n.1 (2009)

La Società Salernitana di Storia Patria aderisce al progetto EleA e autorizza la pubblicazione del fascicoloSul recto del frontespizio : fasc. 51 della Nuova Serie (Annata LXIX dalla fondazione)N.s. A. 26, n.1 (2009): Iacono, A., Il trionfo di Alfonso d'Aragona tra memoria classica e propaganda di corte, P. 11 ; De Majo, S., Impresa e industria a Salerno nel secondo Novecento, P. 59 ; Musi, A., Salerno contemporanea, P. 185 ; Bracco, V., Intorno a una mappa aragonese del Principato citra, P. 191 ; Ruggiero, G., Caterina Volpicelli donna della Napoli dell '800, P. 195 ; D'Episcopo, F., Alfonso Gatto a cento anni dalla Nascita, P. 201 ; Figliuolo, B., Sulla fortuna di Masuccio Salernitano, P. 2017 ; Pedicino, C., La liquidazione dell'ufficio di Regio Secreto e Mastro Portolano delle Province di Principato Citra, Ultra e Basilicata, P. 213 ; Del Noce, G., I crocevia dell'umanesimo e le Marche, P. 241 ; franco, A., Le élites cittadine nel Mezzogiorno bassomedievale, P. 251 ; Pingaro, C., Il valdismo mediterraneo tra medio evo e prima età moderna, P. 255 ; Recensioni e schede bibliografiche, P. 265 ; Schede, P. 296

Rhétorique, poétique et stylistique

L’intérêt pour la rhétorique a bénéficié au xxe siècle de l’impulsion donnée par l’épanouissement des sciences du langage. Libérée de la réputation sinon suspecte, du moins poussiéreuse qui avait longtemps été la sienne, la rhétorique a été reconsidérée à nouveaux frais dans les dernières décennies comme un objet protéiforme, à la fois art et science, un métalangage aux potentialités multiples. Si l’étude de la rhétorique antique, en Grèce et à Rome, est bien connue des chercheurs, son héritage au Moyen Âge et à la Renaissance méritait qu’un examen plus approfondi lui fût consacré. Le retour en grâce de la rhétorique a en effet largement profité à l’étude des textes de l’Antiquité et de l’âge classique, mais les époques médiévale et humaniste sont quelque peu restées en retrait. Durant ces périodes, la rhétorique a pourtant été un ferment vivifiant pour toute la tradition stylistique et poétique latine, et cela est sensible tant à travers les réflexions théoriques qu’à la lumière de la pratique même des écrivains. Il importait de faire le point sur le sujet : telle est l’ambition de cet ouvrage

The telescope assembly of the Ariel space mission

Ariel (Atmospheric Remote-Sensing Infrared Exoplanet Large Survey) is the adopted M4 mission in the framework of the ESA “Cosmic Vision” program. Its purpose is to conduct a survey of the atmospheres of known exoplanets through transit spectroscopy. Launch is scheduled for 2029. Ariel scientific payload consists of an off-axis, unobscured Cassegrain telescope feeding a set of photometers and spectrometers in the waveband between 0.5 and 7.8 µm and operating at cryogenic temperatures (55 K). The Telescope Assembly is based on an innovative fully-aluminum design to tolerate thermal variations avoiding impacts on the optical performance; it consists of a primary parabolic mirror with an elliptical aperture of 1.1 m of major axis, followed by a hyperbolic secondary that is mounted on a refocusing system, a parabolic re-collimating tertiary and a flat folding mirror directing the output beam parallel to the optical bench. An innovative mounting system based on 3 flexure-hinges supports the primary mirror on one side of the optical bench. The instrument bay on the other side of the optical bench houses the Ariel IR Spectrometer (AIRS) and the Fine Guidance System / NIR Spectrometer (FGS/NIRSpec). The Telescope Assembly is in phase B2 towards the Preliminary Design Review to start the fabrication of the structural model; some components, i.e., the primary mirror, its mounting system and the refocusing mechanism, are undergoing further development activities to increase their readiness level. This paper describes the design and development of the ARIEL Telescope Assembly

Ariel: Enabling planetary science across light-years

Ariel Definition Study ReportAriel Definition Study Report, 147 pages. Reviewed by ESA Science Advisory Structure in November 2020. Original document available at: https://www.cosmos.esa.int/documents/1783156/3267291/Ariel_RedBook_Nov2020.pdf/Ariel, the Atmospheric Remote-sensing Infrared Exoplanet Large-survey, was adopted as the fourth medium-class mission in ESA's Cosmic Vision programme to be launched in 2029. During its 4-year mission, Ariel will study what exoplanets are made of, how they formed and how they evolve, by surveying a diverse sample of about 1000 extrasolar planets, simultaneously in visible and infrared wavelengths. It is the first mission dedicated to measuring the chemical composition and thermal structures of hundreds of transiting exoplanets, enabling planetary science far beyond the boundaries of the Solar System. The payload consists of an off-axis Cassegrain telescope (primary mirror 1100 mm x 730 mm ellipse) and two separate instruments (FGS and AIRS) covering simultaneously 0.5-7.8 micron spectral range. The satellite is best placed into an L2 orbit to maximise the thermal stability and the field of regard. The payload module is passively cooled via a series of V-Groove radiators; the detectors for the AIRS are the only items that require active cooling via an active Ne JT cooler. The Ariel payload is developed by a consortium of more than 50 institutes from 16 ESA countries, which include the UK, France, Italy, Belgium, Poland, Spain, Austria, Denmark, Ireland, Portugal, Czech Republic, Hungary, the Netherlands, Sweden, Norway, Estonia, and a NASA contribution