Types of 3D Reconstruction



Ecliptic Cuts

Meridional Cuts

Remote View

Error Cuts

The analysis accessed here provides images from the UCSD 3D reconstructions for most of the SMEI operational data from February 2003 into September 2011. These images include Fisheye and Hammer-Aitoff brightness representations of the heliosphere observed from Earth, a remote- observer view, an ecliptic-plane cut, and an ecliptic-coordinate meridional cut at the location of the Sun-Earth line. The SMEI analyses are presented as completely and continuously as possible through this interval on the hemisphere of the Sun that the instrument was able to access. If IPS velocity data were available to help in these reconstructions they too are shown in the same type image presentation as in the SMEI analyses. The density analyses have had an r-2 fall-off removed from them to show the extent of structures from near the Sun to far from it. This fall-off is also imposed on the remotely-sensed brightness maps to give essentially the same effect from near the Sun to far from it in elongation (see Jackson et al., 2008).

The tomographic analysis gives a model fit determined to within seconds of each SMEI brightness measurement, from which a long-term temporal base has been removed. One-degree square locations on an image farther than three degrees from known bright stars were used in these analyses with background starlight, auroral signals and high energy particle hits removed in a series of iterative processes. The one-degree brightness locations were culled to provide as continuous a long duration response near the Sun, as possible, and this has resulted in ~700 lines of sight being available from each SMEI image to use in the 3D reconstructions presented here. An error plot shows the relative numbers of lines of sight (“LOS”) that cross to provide the modeled SMEI density values at any given location within the volume. Further SMEI tomographic modeling analysis using this technique, that includes an interactive data presentation capability, is available at the NASA Goddard Community Coordinate Modeling Center (CCMC). For more information about this 3D reconstruction analysis the user is referred to Data Processing, and to the references describing this technique. The volumetric data used to produce these images are stored at UCSD.