Séminaire en ligne de ISSI ce jeudi 24 Nov 2022 à 17h
Annonce transmise par Ludwig Klein (LESIA)
Extreme solar eruptive events and their terrestrial impacts:
Online Seminar with Ilya Usoskin (University of Oulu, Finland)
Thursday, 24th November 2022 | 17h CET | 11h EST
Solar energetic eruptive processes, such as flares and coronal mass ejections, are relatively well-studied during the past decades of direct observations. Although their maximum strength/energy is not constrained by direct data because of a too-short period of observations, we know that extreme events do occur rarely on the Sun over the last millennia, thanks to cosmogenic-proxy data, and also on sun-like stars, thanks to high-precision stellar photometry. Not only we can estimate their occurrence probability but even reconstruct energy spectra and assess the dramatic terrestrial and societal impacts. However, the nature of such events remains unclear – are they 'normal' but just extremely strong solar flares (Black Swans) or do they represent an unknown type of solar events (Dragon Kings)? A summary of the existing pieces of knowledge will be presented along with a try to make a distinction between the Black-swan and Dragon-king scenarios of the extreme events.
Ilya Usoskin graduated from Leningrad Polytechnics in 1988, then worked as a researcher at Ioffe Physical-Technical Institute in St. Petersburg until 1997, a postdoc at INFN Milano from 1997-1999, and head of Oulu Cosmic ray station since 2000. He has Cand.Sci. degree in Astrophysics (1995) and PhD in Space Physics (2000). Full professor of Space Physics since 2012. He has several awards, most honourable are: 1st-class Knight of the Order of Lion of Finland (2013), Julis Bartels medal of EGU (2018), full membership in the Finnish Academy of Sciences and Letters (2019), ISEE Science Award (Nagoya, 2020). He is an expert in Solar, Heliospheric, Cosmic-ray, Solar-terrestrial and Atmospheric physics, a founder of the Space-Climate research discipline, and an actively servant to the community: Vice-President of IAU, member of the C4 commission of IUPAP, editor for several journals, etc.
We are looking forward to the talk and to your participation.
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Starting in the summer of 2020, the International Space Science Institute has organized the weekly on-line seminar series called "Game Changers". After five series of talks on the themes of "Missions that Changed the Game in Solar System, Astrophysics and Earth Sciences" , "Ideas and Findings about the Solar System, the Universe and our Terrestrial Environment", "Habitability – From Cosmic to Microbial Scales", "Viewing Earth from Space – the Changing Environment and Climate of our Planet", and "Captivating Cosmology: From the Big Bang to Tomorrow", the new seminar series is dedicated to the topic "Space Environmental Hazards: Mitigation and Prediction"