Question about Jaguar Raiden... green glow under ship?

[Eltigro]

Hey there, noticed something yesterday while playing Raiden on the Jaguar.  Sometimes there is a green glow under my ship.  Not sure if it's a glitch or if it's something in the game...  Just wanted to see what others here thought.  I haven't been able to find anything about it in the manual or online.  I've included some pics... 

 

Here's what the ship normally looks like.  Has the greenish flames coming out of the engines in the back...

 

Here's the "glow" I'm wondering about.  Seems like the glow from the engines is gone, and it looks like a single green... something under the ship.  I've included a shot of it from straight on top and one where I'm moving to the right.

 

 

Any ideas?  I haven't noticed this in other Raiden games, but then, I only just noticed it yesterday in the Jaguar version.

[+BitJag]

I remember seeing this as well.  It's been a while since I last played Raiden on the Jag, but it seems like this would happen when there was a change of scroll speed?  (during boss battles)  To indicate the plane is more hovering than flying forward.  It's a nice detail.

[sirlynxalot]

Agree with lachoneus, I always interpreted it to represent that the ship was hovering in place (e.g., I think it only happens during boss battles when you're no longer moving forward).