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

Measuring distances in astrophysics

le 12 septembre 2025, par Katia Ferrière, Summary: I will take you on a cosmic journey from the Earth to the far reaches of the observable Universe. We will first spend some time in the solar system, where I will show how the radius of the Earth and the distances to the Moon, the Sun […]

A Universe of Waves

le 5 septembre 2025, 10h45 à 12h45, Arturo Lopez-Ariste, salle Jules Verne, OMP, site Belin Summary: The phase of a wave can only be defined unambiguously for complex waves. This strange quantity appears at the core of all physics: from the quantification of atomic levels or of the electric charge to the source of the […]

Asteroseismology of Neutron Stars

le 10 novembre 2023, 10h45 à 12h45, David Tsang, salle Jules Verne, OMP, site Belin Resumé: I will discuss the basic structure of Neutron stars, including the Tolman-Oppenheimer-Volkoff equations, the dense matter equation of state, and the properties of the neutron star crust and core. I will then discuss how asteroseismic modes of a neutron star […]

Rechercher