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Questions tagged [plume]

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54 views

Why does the PSLV first stage's exhaust plume turn to bluish at high altitude?

After few seconds, post liftoff(anywhere between 60s and 90s), the exhaust plume of PSLV turns into a bluish colour. This is quite evident in night launches than day launches(obviously because the ...
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0answers
52 views

What causes these plume features on Delta IV Heavy?

Just catching up on the Jan 19th launch of NROL-71 on board the Delta IV Heavy and I noticed these very prominent features in the exhaust plumes, beginning around the time the centre core is throttled ...
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0answers
283 views

Why is the exhaust plume of Falcon 9 upper stage shaped the way it is?

The (single) Merlin 1D vacuum engine's exhaust plume has a symmetric shape, comprising of six distinct "inner" plumes. Why does it have this shape? Is it due to the shape/configuration of fuel ...
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2answers
443 views

How bright is a rocket launch?

How bright (in Watts, preferably, or lumens) is the plume from a rocket launch (e.g. a SpaceX launch)? Obviously in its direction of travel it isn't particularly bright, but what is its effective ...
7
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2answers
193 views

Identity of source of Rocket Plume visible Eastern Australia, north of Scorpio, midnight 28 July 2016?

Visiting friends in the Northern Tablelands of NSW. I went outside and observed a clear diffuse blob to the north of Scorpio. At first I thought, comet, however binoculars revealed a characteristic ...
5
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1answer
843 views

What is this additional plume on the Falcon 9, and is it being ignited/corrected for?

I hadn't noticed it before, but after seeing yesterday's recap video of the recent Launch and Landing of the Falcon 9, I'm wondering what the plume visible during ascent is. You can see it clearly ...
4
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2answers
8k views

What does the exhaust plume of a rocket look like in vacuum?

There are plenty of photos of rocket tests and launches in atmosphere, and in these the exhaust plume tends to be a long thin flame. Is this true for when rocket engines operate in a vacuum? My guess ...
4
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1answer
272 views

Why are the exhaust plumes exiting the nozzles of SpaceShip Two segmented along their length?

Here is a photo of SpaceShip 2's exhaust shortly after ignition during the test flight in January Why do they have that segmented structure, and how does it affect thrust?
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How could a minimal sample return only from the plumes of an ice moon, Ceres or Io be designed?

Would it be feasible and would it make sense to minimalistically design a sample-return-only mission (or class of missions) along these lines: Light weight plume collecting aerogel (like the Stardust ...