The Grad‐Shafranov reconstruction technique involves the Grad‐Shafranov equation governing2 12dimensional structures, and the magnetic and plasma measurements from a single spacecraft. It is capable of deriving, quantitatively, a 2D cross section characterizing non‐axisymmetric, cylindrical magnetic structures. Its applications to observations in the inner heliosphere, such as the magnetic flux ropes observed by spacecraft WIND and ACE, are reported. Multi‐spacecraft validation and its application to structures beyond 1 AU are discussed. © 2004 American Institute of Physics