Geometrical Properties of Coronal Mass Ejections

Hebe Cremades, Volker Bothmer
2004 Proceedings of the International Astronomical Union  
Based on the SOHO/LASCO dataset, a collection of "structured" coronal mass ejections (CMEs) has been compiled within the period 1996-2002, in order to analyze their threedimensional configuration. These CME events exhibit white-light fine structures, likely indicative of their possible 3D topology. From a detailed investigation of the associated low coronal and photospheric source regions, a generic scheme has been deduced, which considers the whitelight topology of a CME projected in the plane
more » ... jected in the plane of the sky as being primarily dependent on the orientation and position of the source region's neutral line on the solar disk. The obtained results imply that structured CMEs are essentially organized along a symmetry axis, in a cylindrical manner. The measured dimensions of the cylinder's base and length yield a ratio of 1.6. These CMEs seem to be better approximated by elliptic cones, rather than by the classical ice cream cone, characterized by a circular cross section.
doi:10.1017/s174392130500013x fatcat:x6nuftr7h5gn7mart7i4ieij4m