LASCO (Large Angle and Spectrometric COronagraph) C3 is a coronagraph part of the SOHO (SOlar and Heliospheric Observatory) suite. It observes the Sun from 3.7 to 32 solar radii. Here are two movies showing the three ejections from NOAA active region 9236 in November 24, 2000. On the left-hand side, the real movie showing running differences (i.e. the difference of consecutive images usually between 24 and 60 minutes apart). It includes at the end of the movie, the ejection from NOAA active region 9240 on the eastern side). On the right-hand side, a synthetic (aka from our simulation) movie showing running ratios (i.e. the ratio of consecutive images corresponding to the same times as the real movie).

In both movies, denser areas appear as white and area of sparser material as dark. The difference in the quantity plotted (difference vs ratio) results in the synthetic movie to track preferentially the leading edge of the ejections whereas the real movie tracks the dense core of material as well.

The goal of these two movies is to show that the simulation reproduces the general features of the ejections as observed by LASCO C3. In particular, the three ejections propagate faster in the NW quadrant and the velocities of the three ejections are in the right range.
The next step is to produce synthetic images from the STEREO Heliospheric Imagers.