Proc. SPIE 5901, 590101, 1−12, 2005
Solar Physics and Space Weather Instrumentation
S. Fineschi and R.A. Viereck (eds.)
© SPIE − The International Society for Optical Engineering

Low Resolution Three Dimensional Reconstruction of CMEs Using Solar Mass Ejection Imager (SMEI) Data

B.V. Jackson, A. Buffington, P. Hick and X. Wang
Center for Astrophysics and Space Sciences, University of California San Diego


White-light Thomson scattering observations from the Solar Mass Ejection Imager (SMEI) have recorded the inner heliospheric response to many CMEs. Here we detail how we determine the extent of several CME events in SMEI observations (including those of 28 May 28 and 28 October, 2003). We show how we are able to measure these events from their first observations as close as 20° from the solar disk until they fade away in the SMEI 180° field of view. We employ a 3D reconstruction technique that provides perspective views from outward-flowing solar wind as observed at Earth. This is accomplished by iteratively fitting the parameters of a kinematic solar wind density model to the SMEI white light observations and to Solar-Terrestrial Environment Laboratory (STELab), interplanetary scintillation (IPS) velocity data. This 3D modeling technique enables separating the true heliospheric response in SMEI from background noise, and reconstructing the 3D heliospheric structure as a function of time. These reconstructions allow both separation of the 28 October CME from other nearby heliospheric structure and a determination of its mass. Comparisons with LASCO for individual CMEs or portions of them allow a detailed view of changes to the CME shape and mass as they propagate outward.