Strange blue ring

[seruriermarshal]

A photo from IFT-13B test , a strange blue ring in the photo .

 

[seruriermarshal]

An other photo

 

[sferrin]

It's called a smoke ring. :

 

[hagaricus]

http://www.youtube.com/watch?v=J99C5zSnmt4

looks an awful lot like a ring generated by pressure out of the silo at launch?

 

[Michel Van]

looks an awful lot like a ring generated by pressure out of the silo at launch?

That is a smoke ring B)

i alway thought this was Urban Legend, about that Silo launch produced smoke ring.
THX for the evidence ;D