Chelyabinsk Meteor Shockwave 2/15/2013

In summary, the Chelyabinsk meteor destruction was most likely caused by a "superboom" from the meteor exploding and a sonic boom from its supersonic speed. The explosion was estimated to be equivalent to a 300-500 kiloton nuclear weapon, but the shock wave from the explosion itself may not have reached the ground. The meteor's speed and angle of entry may have contributed to the damage caused by the sonic boom. Some have speculated that the meteor was actually a retired Russian military satellite, but there is no evidence to support this theory. The explosion was not a stationary fireball, but instead appeared as a streak due to the meteor's speed. The use of the word "explosion" to describe the event is misleading,
  • #1
TravelinTom
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Was today's Chelyabinsk meteor destruction from an accelerated, focused "superboom" or a sonic boom? I assume it was not an explosion boom. I am trying to understand if the boom destruction radiated from central point or traveled with the meteor as an aircraft's sonic boom continually travels with the airplane. Neither do I understand if the two types of booms would be mutually exclusive and, if not, could there be two audible booms? I am not a physics guy. Have fun with incomprehensible calculations if it interests you but please try to phrase a simple answer for this dummy. Thank you.
 
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  • #2
The meteorite was probably largely composed of iron allowing it penetrate relatively deep into Earth's atmosphere before exploding. Any supersonic body produces a sonic boom, but, that component was much less energetic than the shock wave from the explosion. It was probably a miniature version of the tungaska event.
 
  • #3
Chronos said:
Any supersonic body produces a sonic boom, but, that component was much less energetic than the shock wave from the explosion.

i agree with the above statement. that said, i don't think the shock wave from the explosion itself radiates from the blast location nearly as far as the sonic boom does. most of the damage was due to broken glass, and car alarms went off everywhere. that sounds more to me like the reverberation of a massive sonic boom than it does damage done by the explosion itself.

i live in Sarasota on the west coast of FL, over 150 miles from the Space Shuttle's landing strip at Cape Canaveral. while none of the sonic booms caused by the shuttle upon atmospheric reentry shattered windows in my neighborhood, they've always been clearly audible from such a distance (maybe more or less, depending on where in the atmosphere the shuttle reenters), and i could always "feel" it in addition to hearing it. a quick google search revealed that scientists believe this object to have been approx. 50 feet in diameter and weighed approx. 7,700 tons (source is The Christian Science Monitor believe it or not LOL). its reentry speed was estimated at 19 mi/s, or ~68,000 mi/h (source is Digital Monitor). now considering 1) its cross section along its axis of motion is much larger than the shuttle's, 2) its almost certainly much less aerodynamic than the shuttle, and 3) its reentry speed was approx. 4 times faster than that of the shuttle's reentry speed, i can see how its sonic boom might be that much louder, energetic, and far-reaching than that of the shuttle's sonic boom upon reentry.

now the blast supposedly released an amount of energy equivalent to a 300-500 kiloton nuclear weapon (source is The Christian Science Monitor), which is approx. 19 to 31 times as powerful as the 16-kiloton warhead that was dropped on Hiroshima in WWII...a large margin of error, i know. but if it exploded at an estimated altitude of 12-15 miles above the Earth's surface (source is The Christian Science Monitor), and knowing that the Hiroshima bomb's blast radius was only ~1 mile, and assuming blast radius does not scale linearly w/ energy output, then I'm not so confident that the shock wave caused by the explosion itself (as evidenced by a blast radius) even reached the ground.

granted this is speculation...what do you think?
 
  • #4
My theory is that the Chelyabinsk "meteor" was an old Russian military satellite being retired under cover of the passing asteroid, deliberately directed at the Chelyabinsk area so that local military teams could go out and rapidly collect the debris. I hope to see some discussion of whether the explosion and shockwave could be consistent with such a hypothesis.

edit: Since the explosion was so big, it might be necessary to suppose a space weapon system with an actual bomb on board.
 
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  • #5
We don't do conspiracy theory/crackpottery here, mitchell. There is no evidence whatsoever of anything more unusual than a once-a-century meteor explosion - and satellites don't explode with atomic bomb force.

Anyway, It wasn't clear to me but it sounds like the primary blast was from the meteor exploding. I was surprised by the way it looked, but having seen too many movies I suppose I was expecting a stationary fireball. If the meteor is moving 30,000 mph, the fireball is also moving at 30,000 mph and looks like a streak instead of a ball.

And incidentally, the shock wave from the explosion would combine with the shock wave from the sonic boom. They are both, after all, emanating from the same place and traveling at the same speed.
 
  • #6
russ_watters said:
And incidentally, the shock wave from the explosion would combine with the shock wave from the sonic boom. They are both, after all, emanating from the same place and traveling at the same speed.

indeed...i hadn't thought about the fact the both shocks were traveling at the same speed. still, the fact that the energy from the explosion itself probably emanated only a relatively short distance from the epicenter, and my own personal experience of hearing the shuttle's sonic boom upon atmospheric reentry on numerous occasions from much greater distances than the typical blast radius of a "small" nuclear weapon leads me to hypothesize that most of the damage was caused by the sonic boom (even if the explosion itself released much more energy than the sonic boom carried with it, albeit in a much more confined space).
 
  • #7
russ_watters said:
Anyway, It wasn't clear to me but it sounds like the primary blast was from the meteor exploding. I was surprised by the way it looked, but having seen too many movies I suppose I was expecting a stationary fireball. If the meteor is moving 30,000 mph, the fireball is also moving at 30,000 mph and looks like a streak instead of a ball.

Much like with the big bang the word "explosion" is missleading. The asteroid didn't explode, it broke up. By breaking up it presented many more fragments to the atmosphere with a much higher total surface area. That in turn generates more/stronger shockwaves than before.
 
  • #8
The meteor is thought to be rock, not iron. People "upstream" probably heard both the sonic boom and the explosion at different times. Also different "loudness".
 
  • #9
What were those secondary explosions? Were these perhaps multiple sonic booms produced by fragments?







Also, I wonder if there were any aircraft in the vicinity when this happened, and if so, how would they have been affected?

Scientists are saying this was a 30-Hiroshima blast.
 
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  • #11
This one provides a pretty decent view of the flash too, from an opposite angle:

I'd read that this object came in on an Earth-grazing trajectory. What would have happened if it was coming in on a surface-normal trajectory? Would it have impacted the ground?
 
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  • #12
sanman said:
I'd read that this object came in on an Earth-grazing trajectory. What would have happened if it was coming in on a surface-normal trajectory? Would it have impacted the ground?
No it wouldn't.
Check this handy impact calculator to get a feel for various angles, velocities etc.,:
http://www.purdue.edu/impactearth/
 
  • #13
Bandersnatch said:
No it wouldn't.
Check this handy impact calculator to get a feel for various angles, velocities etc.,:
http://www.purdue.edu/impactearth/

Thank you, I also had the same question regarding this.
 
  • #14
Bandersnatch said:
No it wouldn't.
Check this handy impact calculator to get a feel for various angles, velocities etc.,:
http://www.purdue.edu/impactearth/

Hey, that was pretty cool. I was disappointed that I didn't get to see anything go splat, however.

Maybe that could be a good idea for an app.
 
  • #15
Why did the meteor explode? What specifically caused the fireball (the abrupt increase in brightness) for example? That is, what is the physics behind such a fireball versus one that just ablates and burns down to nothing? Meteors are made up of materials were normally consider explosive, so what produces the energy we see in such a fireball? What's the mechanism? Did the material of the meteor vaporize and the constituents burn?
 
  • #16
The energy is just the kinetic energy of the meteor. Space shuttles have to fight with that, too, and leave a similar (but much smaller) trace. Air drag is so extreme that it can break the object (if you hit a stone hard enough with anything, it will break - even if it is a single, massive block).
 
  • #17
Of course it's the kinetic energy but what specifically causes the fireball as opposed to the meteor just ablating down to nothing? Even if the meteor breaks up that doesn't mean that it will become a fireball. What the videos showed was an abrupt increase in the brightness of the fireball--what produced that light? Was it photons produced by breaking of the molecular bonds of many small particles of the meteor? Was it rapid combustion of the atomized material of the meteor? Or was it some other process?

Kinetic energy + the material of the meteor are the inputs and the light (among others) is the output: what is the physical process that takes those inputs and produces that output?
 
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  • #18
Many, fast particles flying through the atmosphere heat a lot of air. And a lot of hot air in some region is a fireball.

What the videos showed was an abrupt increase in the brightness of the fireball--what produced that light?
A significant increase in air drag due to fragmentation.
Hot air radiates, just as it does in a fire. Blackbody radiation, plus some parts due to internal transition in molecules.
 
  • #19
mfb said:
Many, fast particles flying through the atmosphere heat a lot of air. And a lot of hot air in some region is a fireball.


A significant increase in air drag due to fragmentation.
Hot air radiates, just as it does in a fire. Blackbody radiation, plus some parts due to internal transition in molecules.
Is fragmentation alone enough to cause the rapid transition from a burning meteor streaking through the sky leaving something like a contrail to the rapid increase in size and brightness that we saw? The amount of light produced and the size of the "explosion" (variously estimated from 0.1 to 300 kilotons) suggests, at least to me, something more dramatic, such as abrupt vaporization and combustion. But that's just my guess.
 
  • #20
A fluid like water feels hard to someone jumping off the Golden Gate bridge, so they say, and I believe "them", although I've never tried this folly myself! If a poor little asteroid doing nothing but just falling freely is swatted by a great big planet and made to accelerate to relative rest at several tens of "gees", even the planetary atmosphere must seem much harder to it than the sea does to a jumper. Think tornadoes blowing at speeds of km/sec! The asteroid's presumed non-aerodynamic shape and heterogeneous make-up will then make the forces that accelerate it generate internal stresses that are both inhomogeneous and extreme, which are likely to cause very sudden fracture and a (small b's) big bang. Think of throwing a large diamond into a jet intake. Not that you would dream of actually doing this!

Then glappkaeft's scenario (post #7) takes over.
 
  • #21
The amount of light produced and the size of the "explosion" (variously estimated from 0.1 to 300 kilotons) suggests, at least to me, something more dramatic, such as abrupt vaporization and combustion. But that's just my guess.
The energy of any chemical reactions is small compared to the kinetic energy of the asteroid. Smaller parts have a higher drag to mass ratio, so they lose their kinetic energy quicker than the big part. If the material is not very stable on a large scale, I could imagine a quick fragmentation of those fragments as well, further increasing air drag.
 
  • #22
A useful rule-of-thumb is that an object traveling at 3 km/s has the same kinetic energy as a similar mass of TNT has chemical energy. Now if the meteor was traveling at 15-18 km/s the meteors kinetic energy would be equivilent of 25-36 times its mass in TNT.
 

1. What was the Chelyabinsk Meteor Shockwave?

The Chelyabinsk Meteor Shockwave, also known as the Chelyabinsk Event, was a large meteor that entered the Earth's atmosphere and exploded over the city of Chelyabinsk, Russia on February 15, 2013.

2. How big was the meteor and where did it come from?

The meteor was estimated to be around 20 meters in diameter and came from the Apollo asteroid group, which orbits the sun and crosses Earth's orbit.

3. What caused the shockwave and why was it so powerful?

The shockwave was caused by the rapid heating and expansion of the air surrounding the meteor as it entered Earth's atmosphere at a speed of about 60 times the speed of sound. The explosion was equivalent to about 30 times the energy of the atomic bomb dropped on Hiroshima, making it one of the largest meteor events in modern history.

4. Were there any injuries or damage from the shockwave?

Yes, there were over 1,500 people injured by the shockwave, mainly from shattered glass and other flying debris. There was also significant damage to buildings, including broken windows and collapsed walls.

5. What can we learn from the Chelyabinsk Meteor Shockwave?

The Chelyabinsk Event serves as a reminder of the potential threat of near-Earth objects and the importance of tracking and monitoring them. It also provides valuable data for scientists studying the composition and behavior of meteors and their impact on Earth's atmosphere. Additionally, it highlighted the need for better infrastructure and emergency preparedness in the event of a meteor impact.

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