Magnetic fields 4 Magnetic-field Stars Stars: magnetic field 2 stars: magnetic field 2 Accretion flow 1 Accretion: accretion disks 1 Active stars 1 Binaries:eclipsing 1 Black Hole physics 1 Black holes 1 Case-studies 1 Chemical elements 1 Contact discontinuities 1 Coupling process 1 Eclipsing binaries 1 Field evolution 1 Flaring activity 1 Galaxies 1 Galaxies clusters 1 Gamma rays 1 Gamma-ray burst: generals 1 Global solutions 1 Gravitation 1 Kelvin- helmholtz instabilities 1 Light curves 1 Magnetic couplings 1 Magnetic field line 1 Magnetohydrodynamics 1 Merging 1