Current sheets 1 Eigenvalues and eigenfunctions 1 Heliospheric current sheet 1 Hyperbolic tangent 1 Local structure 1 Magnetic fields 1 Magnetic topologies 1 Principal component analysis 1 Principal-component analysis 1 Rotation 1 Solar wind 1 Solar/wind 1 Spacecraft 1 Spacecraft trajectories Sun: heliosphere 1 Sun: magnetic fields 1 Sun:magnetic fields 1 Topology 1