Magnetic field measurement Magnetic fields 16 Magnetic materials 8 Magnetohydrodynamics 8 Solar energy 8 Sun: corona 6 Sun: magnetic fields 6 Sun: oscillations 6 Absorption 4 Clouds 4 Coronal loops 4 Coupled systems 4 Critical values 4 Eigen-frequencies 4 Eigen-modes 4 Energy efficiency 4 Energy equation 4 Energy principles 4 Equation of motion 4 Equations of motion 4 Equilibrium parameters 4 Fluid dynamics 4 Helicity 4 Hermitian operators 4 Hydrodynamics 4 Intensity values 4 Irreversible energy 4 Long wavelengths 4 Magnetic energies 4 Magnetic field configurations 4