BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Osservatorio Astrofisico di Catania - ECPv6.14.0//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Osservatorio Astrofisico di Catania
X-ORIGINAL-URL:https://www.oact.inaf.it
X-WR-CALDESC:Eventi per Osservatorio Astrofisico di Catania
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:UTC
BEGIN:STANDARD
TZOFFSETFROM:+0000
TZOFFSETTO:+0000
TZNAME:UTC
DTSTART:20250101T000000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=UTC:20250304T151500
DTEND;TZID=UTC:20250304T151500
DTSTAMP:20260404T185443
CREATED:20250303T091409Z
LAST-MODIFIED:20250305T091510Z
UID:17753-1741101300-1741101300@www.oact.inaf.it
SUMMARY:Lo Spazio come bene comune dell'umanità
DESCRIPTION:DATA:  Martedì\, 4 Marzo\, 15:15 \nORGANIZZATORE: INAF-OACT \nLOCATION: AULA OVEST (INAF-OACT) \nSPEAKER: Prof.ssa Patrizia Caraveo (Presidente della Società Astronomica Italiana e Dirigente di Ricerca presso INAF-IASF di Milano) \nAd oggi\, ci sono in orbita circa 10.000 satelliti operativi (e non meno di 3.000 per così dire “defunti”). Offrono servizi di grande utilità per migliorare la qualità della nostra vita\, ma occorre considerare le conseguenze della crescita esplosiva nel loro numero. Benché operino nello spazio\, i satelliti hanno infatti un impatto non trascurabile sulla vita e sulle attività che si svolgono sulla Terra e sulla qualità della nostra atmosfera. Lo spazio è parte integrante dell’ecosistema terrestre e prima ce ne renderemo conto meglio sarà.
URL:https://www.oact.inaf.it/event/lo-spazio-come-bene-comune-dellumanita/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2025/03/Patrizia-Caraveo-2.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250319T113000
DTEND;TZID=UTC:20250319T113000
DTSTAMP:20260404T185443
CREATED:20250304T175229Z
LAST-MODIFIED:20250305T075408Z
UID:17742-1742383800-1742383800@www.oact.inaf.it
SUMMARY:Status and future of 21-cm cosmology during the first billion years
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE:  Wednesday\, March 19\, 11:30 a.m. \nORGANIZER: INAF-OACT \nLOCATION: AULA OVEST (INAF-OACT) + remote \nLink for the remote audience:https://meet.google.com/wvf-uwxo-oyj \nSPEAKER: Prof. Andrei Mesinger (Scuola Normale Superiore\, Pisa) \nABSTRACT:The 21-cm hyperfine line of neutral hydrogen is set to revolutionize studies of the first billion years\, spanning the cosmic dawn of the first stars and eventual reionization of our Universe. I will discuss the potential of this probe in learning about the unknown astrophysics of the first galaxies as well as physical cosmology. Current upper limits on the cosmic 21-cm power spectrum already provide new insights into the heating of the intergalactic medium\, and the X-ray sources in the first galaxies. I will discuss the upcoming steps\, including the main challenges\, that will eventually lead to the Nobel prize-worthy 3D map of half of our observable Universe with the Square Kilometer Array (SKA) telescope.Our results show that a large scales we observe a continuous interplay between turbulence and gravity\, where the former creates structures at all scales and the latter takes the lead above a critical value of the surface density is reached\, ~ 0.1 g cm^-2. At the same time\, the fragmentation properties show several indications that the fragment are “clump-fed”\, i.e. the process is dynamical and the gravity dominates the collapse inside our massive clumps. \n  \nA few rules:— in case of large in-person attendance\, attendees may be asked to wear a face mask— before joining\, make sure you are using your institutional inaf.it account if you have one (otherwise we will grant you permission to join)— please do not forget to mute your microphone and switch off your webcam when access the virtual room— for questions leave a message in the chat\, the answers at the end of the webinar— the seminar will be recorded\, so if you are interested in it\, please contact us to get the link to the registration.
URL:https://www.oact.inaf.it/event/status-and-future-of-21-cm-cosmology-during-the-first-billion-years/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2025/03/Seminario_mesinger.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250327T110000
DTEND;TZID=UTC:20250327T120000
DTSTAMP:20260404T185443
CREATED:20250324T093404Z
LAST-MODIFIED:20250324T093407Z
UID:17877-1743073200-1743076800@www.oact.inaf.it
SUMMARY:How is magnetism affecting the properties of solar and stellar acoustic modes?
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE:  Thursday\, March 27\, 11:00 a.m. \nORGANIZER: INAF-OACT \nLOCATION: AULA OVEST (INAF-OACT) + remote \nLink for the remote audience:https://meet.google.com/wvf-uwxo-oyj \nSPEAKER: Dr. Eva Panetier (CEA Saclay\, Université Paris Cité) \nABSTRACT:Outside of solar neutrinos\, the only way to directly probing solar and stellar interiors is to use seismic techniques\, i.e. studying the waves propagating inside them. In the case of the Sun\, acoustic waves are excited by turbulent motion in the convective envelope\, and propagate towards the interior\, creating a variety of standing pressure modes (p modes). By investigating how small perturbations influence the modes parameters\, it is possible to probe the structural and dynamical properties of the star such as internal rotation and mixing\, chemical composition\, density\, convection zone depth\, etc. In the stellar case\, asteroseismology allows the inference of the stellar fundamental parameters such as mass\, radius\, and age. Although\, solar p-modes frequency\, amplitude\, and energy vary in relation with the solar magnetic cycle and similar variations were observed for other magnetically active solar-type stars\, such a variability is often overlooked in stellar modelling. In the context of the preparation of the PLATO mission\, whose aim is to characterize Earth-like planets orbiting solar-like stars in part thanks to asteroseismology\, we need to better understand the relation between magnetic variations and modes parameters. In this seminar\, I will focus on the excitation of the solar p modes using the last 28 years of data from the SoHO/GOLF instrument\, with a method gathering a better temporal resolution compared to classical approaches. In this framework\, I was able to perform a statistical study of the energy of the modes. Summing the energy of all studied modes\, I will demonstrate that there is a discrepancy between the observed excitation rate and the expected rate under the hypothesis of excitation driven entirely by turbulent convection. I will discuss the link between this discrepancy and surface magnetism effects such as flares and coronal mass ejection. In conclusion\, I will explain how a better understanding of the relation between the dynamo mechanism and modes properties variation across time would allow us to improve the constraint we have on stellar dynamics and obtained refined stellar fundamental parameters. \n  \nA few rules:— in case of large in-person attendance\, attendees may be asked to wear a face mask— before joining\, make sure you are using your institutional inaf.it account if you have one (otherwise we will grant you permission to join)— please do not forget to mute your microphone and switch off your webcam when access the virtual room— for questions leave a message in the chat\, the answers at the end of the webinar— the seminar will be recorded\, so if you are interested in it\, please contact us to get the link to the registration.
URL:https://www.oact.inaf.it/event/how-is-magnetism-affecting-the-properties-of-solar-and-stellar-acoustic-modes/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2025/03/Locandine-eventi-OACT.jpg
END:VEVENT
END:VCALENDAR