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Earth’s Magnetic Field Made Quick Flip- Flop 2012-10-24 0:00
Earth’s magnetic field reversed extremely rapidly soon after modern humans first arrived in Europe, completely flip-flopping in less than a thousand years, new research suggests.
These findings, detailed Oct. 15 in the journal Earth and Planetary Science Letters,could shed light on how and why magnetic field reversals happen, and how they leave Earth vulnerable to solar and space radiation, the study scientists said.
Earth’s metal core acts like a giant magnet that emanates a magnetic field with two poles, north and south. These two magnetic poles very roughly match where the planet’s geographic north and south poles lie, which mark the axis on which Earth spins.
The Earth’s magnetic field, magnetic poles and geographic poles.
"The Earth’s magnetic field is a highly dynamic feature," said researcher Norbert Nowaczyk, a paleomagnetist at the GFZ German Research Centre for Geosciences. "Its intensity pulsates between values 50 percent higher than today, or 90 to 95 percent lower than today."
In addition, every several hundred thousand years, Earth’s magnetic field reverses — a compass that would have pointed north would instead aim south. These flips are captured by magnetically sensitive minerals in cooling lava that are literally set in stone pointing to where the poles were at that particular moment in Earth’s history.
Full reversals of the magnetic field usually take millennia to finish, based on those frozen rock records. However, scientists now find that 41,000 years ago, shortly after modern humans first entered Europe, the magnetic poles flipped and flipped again in less than a millennium.
Scientists analyzed data in sediment from the floor of the Black Sea and compared it with other data from the North Atlantic, the Southeast Pacific and around Hawaii. Surprisingly, they found the Earth’s magnetic field took about 200 years to flip, during which time it was just one-twentieth as strong as it is today.
"Former ideas about a field reversal deal with durations of 2,000 to 5,000 years," Nowaczyk told OurAmazingPlanet.
Earth’s magnetic field stayed reversed for only 440 years, during which time it was just one-quarter as strong as it is today. The magnetic poles then flipped back to approximately where they were before over the course of about 270 years. The flip-flop overall is known as the Laschamp event, after the area in France where evidence of it was first discoveredin the 1960s. These new findings reveal how quick this reversal was.
The brevity of this flip overall suggests "it might represent a so-called aborted reversal," Nowaczyk said. "This means the geomagnetic field tried to reverse, but fell back." Such aborted reversals, also known as excursions, may have happened at least a dozen times during the last 780,000 years since the last full reversal, he explained.
Magnetic field shield
Earth’s magnetic field helps protect the planet from energetic particles streaking out from deep space and the sun. During the Laschamp reversal, Earth was significantly more vulnerable to radiation from space, judging by higher levels of radioactive beryllium seen in ice samples from Greenland, Nowaczyk said.
Such radiation poses a particular threat in our modern world, so understanding these reversals is helpful to better understand the threats from space.
"Communication and GPS satellites might be damaged when the cosmic rays are less shielded by the geomagnetic field," Nowaczyk said. "Therefore, it is important to know how dynamic the geomagnetic field is in time and space. We need to know how fast changes in intensity, and thus shielding ability, can happen."
Earth’s magnetic field is generated by the roiling of its outer liquid core. Research suggests that at times this outer core can behave as many magnets instead of one. These magnets can, in principle, cancel each other out, causing the magnetic field overall to weaken or flip.
"We need more data from more sites of the same reversal to get a better understanding of these processes," Nowacyzk said.
German Schoolchildren will Cook and Clean for â€śRefugeesâ€ť as Part of Work Experience 2015-10-13 0:44
Schoolchildren from an undisclosed school in the city of LĂĽbeck, Schleswig-Holstein, will spend a week doing housework for so-called â€śrefugeesâ€ť.
The idea was sold to parents at a parentsâ€™ meeting as a â€śpractical internshipâ€ś, but has sparked outrage online.
A letter to the parents said their children will be going to â€śrefugeeâ€ť accommodations and will be making beds, sorting clothes, and ...
MTV: Saying "No Can Do" Or "Long Time No See" Is Racist 2015-10-12 23:04 Harmless terms have offensive origins, asserts Franchesca Ramsey
According to MTV News, using the phrases “long time no see,” “peanut gallery” and “no can do” is offensive because the terms have “racist beginnings.”
Host Franchesca Ramsey begins by claiming that the term “peanut gallery” is offensive because it was once the place where black people were “forced” to sit at the theater ...
Migrants Dump Garbage from Their Balconies at German Asylum Center 2015-10-12 23:35
German authorities expect up to 1.5 million asylum seekers to arrive in Germany this year – up from 750,000 last month.
So they can expect more of this–
Migrants Dump Garbage from their Balconies : Augsburg Asylum Center, Germany
In a recent poll, the number of “frightened” Germans jumped from 38% to 51% in three weeks.
Muslim Statistics reported, via Religion of Peace:
The latest ...
US Paradrops 50 Tons Of Ammo To Syrian Rebels 2015-10-12 22:32
As we noted over the weekend, the US has now thrown in the towel on the ill-fated (and that’s putting it lightly) strategy of training Syrian fighters and sending them into battle only to be captured and killed by other Syrian fighters who the US also trained.
The Pentagon’s effort to recruit 5,400 properly “vetted” anti-ISIS rebels by the end of ...
Migrant Crisis stand-up routine - Sam Hyde 2015-10-10 18:07
YouTube description: "Migrant" "Crisis" AKA Muslim Road Trip. Hundreds of thousands of astronauts, doctors, sciencemen, and peaceful clock inventors descend upon the countries with the most collective guilt and free stuff.
This was pretty good man... I wasn't expecting this reaction from the same Boston college audience who so thoroughly disapproved of my 'Mike Brown' routine. I think the invasion of ...