From: no-spam@invalid.com   
      
   > >It looks to me more like shock-wave interactions between the outboard   
   > >plumes and the central plume.  The "streak" brightens and dims in a   
   > >regular pattern, much like the shock diamonds in the exhaust from a   
   > >single nozzle.   
   >   
   >   
   > Except that A: shock diamonds are usually clearly visible when shocks   
   > interact in such fashion, but aren't visible here, and more importantly   
   > B: the same effect was observed in a test of a *single* RS-68 which   
   > could not possibly have been participating in any multi-plume interaction.   
      
   Isn't the core booster running at partial throttle at that time, to   
   reduce acceleration?  Maybe that particular set of shock diamonds   
   depends on throttle setting.   
      
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