Comment on Blue Origin has hot fired its BE-4 rocket engine for the first timeparentComments−trothamel8yI believe those are Mach/Shock diamonds, which are common in rocket engine exhaust. It wouldn't surprise me if the propellant and the time of the test made them more visible.https://en.wikipedia.org/wiki/Shock_diamond−tim3338yAs also seen on page 2 of "Ignition" with page 3 showing some other interesting rocket effects. http://library.sciencemadness.org/library/books/ignition.pdf
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I believe those are Mach/Shock diamonds, which are common in rocket engine exhaust. It wouldn't surprise me if the propellant and the time of the test made them more visible.
https://en.wikipedia.org/wiki/Shock_diamond
As also seen on page 2 of "Ignition" with page 3 showing some other interesting rocket effects. http://library.sciencemadness.org/library/books/ignition.pdf