Magnetohydrodynamics (MHD) Magnetic fields 16 Magnetohydrodynamics 16 Interplanetary medium 12 Solar wind 12 Sun: magnetic fields 10 Expansion rate 8 Flux ropes 8 Magnetic clouds 8 Magnetized plasmas 8 Magnetoplasma 8 Solar system 8 Sun: coronal mass ejections (CMEs) 8 Velocity profiles 8 Sun 6 Aspect ratio 4 Astronomical units 4 Astrophysics 4 Chaos theory 4 Clouds 4 Coronal mass ejection 4 Cross section 4 Dynamical evolution 4 Expansion 4 Expansion properties 4 Global quantities 4 Helicities 4 Heliospheres 4 In-situ 4 In-situ observations 4