pressure gradient 10 Pressure gradient 6 Argentina 4 Astrophysics 4 Boundary layer flow 4 Boundary pressure 4 Coronal mass ejection 4 Cylindrical flux ropes 4 Energy conservation 4 Expansion 4 Expansion rate 4 Fluid dynamics 4 Flux ropes 4 Force free fields 4 In-situ observations 4 Magnetic clouds 4 Magnetic energies 4 Magnetic fields 4 Magnetic flux 4 Magnetic flux ropes 4 Magnetic helicity 4 Magnetic structure 4 Magnetohydrodynamics 4 Ordinary differential equations 4 Plasma velocity 4 Radial distributions 4 Radial expansions 4 Radial velocity 4 Self-similar 4 Solar energy 4