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We compare different methods to reconstruct the three-dimensional (3D) CMEmorphology. The explored methods include geometric localisation, mask fitting,forward modeling, polarisation ratio and local correlation tracking plustriangulation. The five methods are applied to the same CME event, whichoccurred on August 7 2010. Their corresponding results are presented andcompared, especially in their propagation direction and spatial extent in 3D.We find that mask fitting and geometric localisation method produce consistentresults. Reconstructions including three-view observations are more precisethan reconstructions done with only two views. Compared to the forward modelingmethod, in which a-priori shape of the CME geometry is assumed, mask fittinghas more flexibility. Polarisation ratio method makes use of the Thomsonscattering geometry. We find spatially the 3D CME derived from mask fittinglies mostly in the overlap region obtained with the polarisation method fromCOR2 A and B. In addition, mask fitting can help resolve the front/backambiguity inherent in the polarisation ratio method. However, local correlationtracking plus triangulation did not show a consistent result with the otherfour methods. For reconstructions of a diffuse CME, when the separation anglebetween STEREO A and B is large, finding two corresponding points in a STEREOimage pair becomes very difficult. Excluding the local correlation trackingmethod, the latitude of the CME's centre of gravity derived from the othermethods deviates within one degree and longitude differs within 19 degrees.

Comparisons of CME morphological characteristics derived from five 3D reconstruction methods