File footage of a sounding rocket with a dark, non-luminescent, sooty exhaust with mach-diamond-like oscillations is shown in the video 1957-1959 IBM 704 Computer - Vanguard Satellite Program "Science in Space" (Burroughs Datatron) NASA starting at
03:28 (alternate version of the video here).
These oscillations are normally seen in bright, luminescent exhaust:
- Wikipedia Shock diamond
- Are these two length scales in FH exhaust plumes real, understood, and distinct? (example images)
I've never seen black, sooty exhaust show this oscillation behavior.
Question: Why does this sounding rocket have black sooty exhaust with mach-diamond-like oscillations? Is this unusual?
Is this something that's been seen regularly in the past and not surprising, or is this some unusual phenomenon?
screenshot showing sounding rocket and dark exhaust with oscillations from "1957-1959 IBM 704 Computer - Vanguard Satellite Program 'Science in Space' (Burroughs Datatron) NASA"