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An invisible ‘force field’ reminisce of Star-Trek’s deflector shields has been discovered 7,200 miles above Earth, protecting the planet from “killer electrons”.
The so-called force field, discovered by astronomers working at the University of Colorado, is found in the Van Allen radiation belts – two doughnut shaped rings above Earth filled with high-energy electrons and protons.
Lead researcher Professor Daniel Baker, from the University of Colorado at Boulder, said: “It’s almost like these electrons are running into a glass wall in space.
“Somewhat like the shields created by force fields on Star Trek that were used to repel alien weapons, we are seeing an invisible shield blocking these electrons. It’s an extremely puzzling phenomenon.”
The team originally thought the highly charged electrons, which loop around the Earth at more than 100,000 miles per second, would slowly drift downward into the upper atmosphere.
But a pair of probes launched in 2012 to investigate the Van Allen belts showed that the electrons are stopped in their tracks before they get that far.
The nature of the force field remains an unsolved mystery.
It does not appear to be linked to magnetic field lines or human-generated radio signals, and scientists are not convinced that a cloud of cold electrically charged gas called the plasmasphere that stretches thousands of miles into the outer Van Allen belt can fully explain the phenomenon either.
Prof Baker added: “I think the key here is to keep observing the region in exquisite detail, which we can do because of the powerful instruments on the Van Allen probes.”
The research is reported in the journal Nature.
Agencies/Canadajournal
