Explosion in Paris ?

[anonymous-user]

seeing twitter noise about a blast / sonic boom or something heard widely across Paris a few mins ago

can be heard on this video of the tennis

https://twitter.com/wiIffff/status/131124581175862...

Edited by anonymous-user on Wednesday 30th September 11:08

[dazwalsh]

Hope it is just a sonic boom rather than anything more deadly.

[vixen1700]

Jet sonic boom being reported...

[AJL308]

Worrying either way. No reason for sonic booms over land, espcially large conurbations, unless the military are going somewhere with great urgency. Besides, they usually come in twos, don't they?

[gruffalo]

AJL308 said:

Worrying either way. No reason for sonic booms over land, espcially large conurbations, unless the military are going somewhere with great urgency. Besides, they usually come in twos, don't they?

Depends how fast they are going I believe, breaking Mach 1 is one boom, break Mach 2 two booms.

[Tim330]

gruffalo said:

AJL308 said:

Worrying either way. No reason for sonic booms over land, espcially large conurbations, unless the military are going somewhere with great urgency. Besides, they usually come in twos, don't they?

Depends how fast they are going I believe, breaking Mach 1 is one boom, break Mach 2 two booms.

That's not correct.

[valiant]

Happened over here a few months ago. A plane lost radio contact or something and Typhoons were scrambled to have a look see. Turned out to be nothing but they won’t hang about in intercepting whatever it is they’re after.

[gruffalo]

Tim330 said:

gruffalo said:

AJL308 said:

Worrying either way. No reason for sonic booms over land, espcially large conurbations, unless the military are going somewhere with great urgency. Besides, they usually come in twos, don't they?

Depends how fast they are going I believe, breaking Mach 1 is one boom, break Mach 2 two booms.

That's not correct.

OK, I know Concorde used to give a double boom as it hit Mach 2, I assumed it was because of the Mach 2 bit.

Very happy to be educated as it was just an assumption.

[Eric Mc]

gruffalo said:

OK, I know Concorde used to give a double boom as it hit Mach 2, I assumed it was because of the Mach 2 bit.

Very happy to be educated as it was just an assumption.

Incorrect assumption.

The boom is caused by the pressure wave from the shock cone which surrounds the aircraft passing over the person on the ground. The bang is how your ear interprets the change in pressure as it passes over you.

However, aircraft, rockets, shells etc often have more than one shock cone. There will be one attached to the nose but there will also be shock cones attached to other protuberances on the object, such as tail fins, wing tips etc. These secondary shock waves may not be as pronounced as the primary boom which usually comes from the nose shock wave.

The Space Shuttle famously emitted a twin boom as it passed over Florida on its way in to land at Cape Canaveral. At that point it was travelling well below Mach 2. The bangs came from a shockwave off the nose and another off the tail fin.

[ThumperMc]

Tough crowd in here today Gruffalo

[Petrus1983]

To need to fly at +Mach 1 over a dense population must surely be authorised higher up than just the pilot himself?

Btw - Gruffalo - I’ve learnt something too

[Byker28i]

ThumperMc said:

Tough crowd in here today Gruffalo

It could have been Basil Brush?

[Byker28i]

Stop calling us, say the police - it was a jet

Préfecture de Police
@prefpolice
Un bruit très important à été entendu à Paris et en région parisienne. Il n'y a pas d'explosion, il s'agit d'un avion de chasse qui a franchi le mur du son.
N'encombrez pas les lignes de secours !

[gruffalo]

Eric Mc said:

gruffalo said:

OK, I know Concorde used to give a double boom as it hit Mach 2, I assumed it was because of the Mach 2 bit.

Very happy to be educated as it was just an assumption.

Incorrect assumption.

The boom is caused by the pressure wave from the shock cone which surrounds the aircraft passing over the person on the ground. The bang is how your ear interprets the change in pressure as it passes over you.

However, aircraft, rockets, shells etc often have more than one shock cone. There will be one attached to the nose but there will also be shock cones attached to other protuberances on the object, such as tail fins, wing tips etc. These secondary shock waves may not be as pronounced as the primary boom which usually comes from the nose shock wave.

The Space Shuttle famously emitted a twin boom as it passed over Florida on its way in to land at Cape Canaveral. At that point it was travelling well below Mach 2. The bangs came from a shockwave off the nose and another off the tail fin.

Thanks, I have indeed learnt something today thank you.

[gruffalo]

ThumperMc said:

Tough crowd in here today Gruffalo

Not really just better informed than I was but I now know more than earlier so it is a good day.

[vaud]

gruffalo said:

ThumperMc said:

Tough crowd in here today Gruffalo

Not really just better informed than I was but I now know more than earlier so it is a good day.

I don't think so. My daughter just said there is no such thing as a...

[RizzoTheRat]

valiant said:

Happened over here a few months ago. A plane lost radio contact or something and Typhoons were scrambled to have a look see. Turned out to be nothing but they won’t hang about in intercepting whatever it is they’re after.

Exactly the same in Paris it would appear, Rafale intercepting a commercial aircraft that had lost Radio contact
https://www.bbc.com/news/world-europe-54357839

[GloverMart]

Byker28i said:

ThumperMc said:

Tough crowd in here today Gruffalo

It could have been Basil Brush?

Underrated post.