In this paper, we will describe the time evolution of am=0instability which was recorded on AGLAE, a 1 TW generator, during the collapse of a neon gas puff. We observe a correlation between images produced by a visible streak camera with slit parallel to the axis of the pinch and that of a temporally resolved pinhole array. The pinhole images are recorded by a four strip X‐Ray MCP camera (Slix) which uses three different filters showing the temporal evolution of a simple spectrum. We also use a two channel time integrated pinhole camera. The behavior of the instability will be correlated with a simple theoretical analysis of the phenomenon. A brief description of the experiment and the diagnostic arrangement will be given. Then detailed analysis of experimental data and their correlation with a snowplow MHD model will be given.