Large Storms On Earth Are Particle Accelerators 166
MondoMor writes "Apparently, the atmosphere above Earth's strongest storms acts like a particle accelerator, according to a UC Santa Cruz paper. TGFs (Terrestrial Gamma ray Flashes) may occur as seldom as 50 times a day, 'but the rate could be up to 100 times higher if, as some models indicate, TGFs are emitted as narrowly focused beams that would only be detected when the satellite is directly in their path.' I'm glad the gamma-ray bursts are directed into space."
Free particle accelerator for use! (Score:5, Interesting)
"The energies we see are as high as those of gamma rays emitted from black holes and neutron stars," Smith said.
The exact mechanism that accelerates the electron beams to produce TGFs is still uncertain, he said, but it probably involves the build-up of electric charge at the tops of thunder clouds due to lightning discharges, resulting in a powerful electric field between the cloudtops and the ionosphere, the outer layer of Earth's atmosphere.
"Regardless of the exact mechanism, there is some enormous particle accelerator in the upper atmosphere that is accelerating electrons to these very high energies, so they emit gamma rays when they hit the sparse atoms of the upper atmosphere," Smith said. "What's exciting is that we are now getting data good enough for the theorists to really test their models."
Cool, huh? It's like having a free, giant, massively powerful particle accelerator for use by scientists, but without having to build a massive building and dealing with constructions costs, red tape, and NIMBY issues.
"Jenkins! I want to test some data. Run it up the flagpole* and tell me the results."
* For sufficiently large flagpole, that is. Hey, combine this with the space elevator and you really got something!)
Important! (Score:2, Interesting)
"If the atmosphere was 200 meters closer to the ground, these particles would trigger a mass extinction."
A fingerprint? (Score:3, Interesting)
Space elevators? (Score:5, Interesting)
How would this affect carbon nanotubes?
And to the ground (Score:5, Interesting)
Although the outward going flashes (first detected by CGRO a decade ago [nasa.gov]) are much stronger, there are also lighting-generated X-rays seen on the ground. [sciam.com]
Re:And to the ground (Score:5, Interesting)
The detectors had to be near the lightning bolt because air absorbs X-rays surprisingly well. Ditto gamma rays, which are the same thing but at higher energies. More than a few feet of air will block X-rays.
Some of the early nuclear bomb tests had to measure gamma rays from the reaction, and to do that they built tunnels filled with polyethylene between ground zero and their detectors for the gamma rays to go through.
Bottom line, don't worry about X-rays from lightning unless you're standing where it strikes, in which case you shouldn't worry about the X-rays anyhow.
Re:Sprites ? (Score:3, Interesting)
On a related note, in the early 1980's, QST was reporting a very strong correlation between thunderstorm activity and sporadic E-layer propagation. Those reports came to mind when first reading about sprites over ten years later.
Hmmm... (Score:2, Interesting)
LK
Re:So it just may be then (Score:3, Interesting)
http://www.discover.com/web-exclusives/natures-nu
It's "human" assisted.... (Score:1, Interesting)
With the huge amounts of RF being pumped into the atmosphere from human activity, it's no wonder that there is a seemingly "natural" particle accelerator up there.
But it's surely a human caused RF assisted event.
Gamma rays and evolution (Score:3, Interesting)
I'm not. If they were directed downward, creatures on earth would have evolved some defenses against irradiation and made space travel (and a lot of other things) a hell of a lot easier.
Re:Gamma rays and evolution (Score:1, Interesting)
And, indeed, it may be that life did evolve a defence to radiation. Nick Lane in his fascinating book "Oxygen: The Molecule that made the World":
http://pages.britishlibrary.net/nick.lane/
Nic
points out that radiation damage and oxidation start from opposite ends of the same radical pathway. So why did the first cells develop anti-oxidant protection before there was much oxygen around ? Nick suggests radiation was the trigger.