Several studies pointed out the joint role of resistivity η and viscosity ν in determining dynamics emergence helical regimes reversed-field pinch (RFP) plasmas. In this framework, self-consistent time evolution coefficients still lacks a fully satisfying modeling, being constrained by many approximations. work, hypothesis flat profile is relaxed: A inspired Braginskii perpendicular implemented...

We formulate axion-electrodynamics and magnetohydrodynamics (MHD) in the cosmological context assuming weak gravity. The two formulations are made for a general scalar field with $f(\ensuremath{\phi})$-coupling, an axion as massive ${\ensuremath{\phi}}^{2}$-coupling, helical electromagnetic field. $\ensuremath{\alpha}$-dynamo term appears naturally from coupling MHD formulation. In presence of ...

Protoplanetary discs are made of gas and dust orbiting a young star. They also the birth place planetary systems, which motivates large amount observational theoretical research. In these lecture notes, I present review magnetic mechanisms applied to outer regions ( $R\gtrsim 1\ \mathrm {AU}$ ) discs, planet-formation regions. contrast usual astrophysical plasmas, in is noticeably cold $T < ...

This paper uses extended-magnetohydrodynamics (MHD) simulations to explore an extreme magnetized plasma regime realisable by cylindrical implosions on the OMEGA laser facility. is characterized highly compressed magnetic fields (greater than 10~kT across fuel), which contain a significant proportion of implosion energy and induce large electrical currents in plasma. Parameters governing differe...