Posts Tagged Fermi Gamma-ray Space Telescope
Our Strange Sky: Fermi Space Telescope Detects Antimatter in Earth’s Thunderstorms
Posted by mistergroonk in Alabama, Science on January 13, 2011
We won’t even attempt to translate what was read in the BBC article. Here’s a bit on the actual anti-matter find.
But within that gamma-ray data lies an even more interesting result described at the meeting by Dr McEnery and her collaborators Michael Briggs of the University of Alabama Huntsville and Joseph Dwyer of the Florida Institute of Technology.
“We expected to see TGFs; they had been seen by the GBM’s predecessor,” Dr McEnery explained.
“But what absolutely intrigues us is the discovery that TGFs produce not just gamma rays but also produce positrons, the antimatter equivalent to electrons.”
When gamma rays pass near the nuclei of atoms, they can turn their energy into two particles: an electron-positron pair.
Because electrons and positrons are charged, they align along the Earth’s magnetic field lines and can travel vast distances, gathered into tightly focused beams of matter and antimatter heading in opposite directions.
The dance of light and matter continues when positrons encounter electrons again; they recombine and produce a flash of light of a precise and characteristic colour.
The magnetic field can transport the particles vast distances before this characteristic flash, and one of the Fermi detections was from a storm that was happening completely beyond the horizon.
The results will be published in the journal Geophysical Research Letters
Informative video below.
antimatter, earth, Fermi Gamma-ray Space Telescope, Huntsville gets some props, lightning, Michael Briggs, nasa, our strange sky, people i share a state with, terrestrial gamma-ray flashes, TGFs, thunderstorms, UAH, UAHuntsville
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