Large Storms On Earth Are Particle Accelerators

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."

Comments

Free particle accelerator for use!

[FunWithHeadlines]

""The idea that the Earth, a fairly small and tame planet, can be an accelerator of particles to ultrarelativistic energies is fascinating to me," said David Smith, an assistant professor of physics at UC Santa Cruz and first author of the paper.

"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!)

Space elevators?

[Lord_Dweomer]

Just wondering if this would disrupt the operation of a space elevator in any way or harm it. I mean, there's no way you can infinitely keep a storm away from one of those things.

How would this affect carbon nanotubes?

And to the ground

[Viadd]

I'm glad the gamma-ray bursts are directed into space.

Although the outward going flashes (first detected by CGRO a decade ago) are much stronger, there are also lighting-generated X-rays seen on the ground.

Re:And to the ground

[Beryllium Sphere(tm)]

The scientists who measured those X-rays were triggering lightning blots by firing rockets with trailing wires into thunderclouds (insurance agent: "And what do you do for a living?"), so their detectors were near the actual lightning strike.

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.