Cosmic magnetic fields

Séminaire

30 août 2021

le 8 octobre 2021, 11h à 13h, Katia Ferrière, salle Coriolis, OMP

Magnetic fields are ubiquitous in the Universe. Most celestial bodies, from planets to stars to galaxies, appear to be magnetized. Even intergalactic space could be threaded by a magnetic field.

Cosmic magnetic fields generally play an important role. They affect the structure of stars and galaxies, govern their internal turbulence, control star formation inside galaxies… They are also responsible for spectacular phenomena, such as polar aurorae, solar flares, galactic jets…

I will start by describing the observational properties of magnetic fields of planets, stars and galaxies. I will then discuss the thorny question of their origin.

Plus d'actualités

The first astronomical databases (700 BC – 100 BC): Babylonian systems and Hipparcus’ works

le 15 novembre 2023, 10h45 à 12h45, Guillaume Loizelet, salle Jules Verne, OMP, site Belin Resumé: It is not possible to develop a mathematical model without a reliable and consistent database.In this session, I will first detail the cultural context that led the Babylonian « astronomers » to establish formidable data collections in the form of clay tablets. […]

A peculiar density profile inside Jupiter

le 6 décembre 2024, 10h45 à 12h45, Florian Debras, salle Jules Verne, OMP, site Belin Resumé: Since 2016, the Juno satellite is orbiting Jupiter and has completely changed our understanding of the planet. From the atmosphere to the deep interior, including the auroras, Juno is providing a wealth of data that challenges models of Jupiter. […]

A step by step rupture (Vth century AD – XVth century AD)

le 22 novembre 2024, 10h45 à 12h45, Guillaume Loizelet, salle Jules Verne, OMP, site Belin Resumé: In this session, I will review the results obtained by historians of astronomy over the last fifty years, which have led to a complete rethinking of the idea of a scientific revolution developed in the mid-twentieth century.I will first […]

Rechercher