- Posted January 28, 2014 by
- Tropical Storm In-Fa expected to regain typhoon strength
- BREAKING NEWS: Hurricane Patricia should be a 'Category 7' storm, says scientist, and here's why
- Massive Hurricane Patricia: Strongest Storm Ever Measured to Hit Mexico
- Indonesia's Mt Sinabung erupts into life again
- John Kerry says spoke to Najib about Anwar, freedom of expression
GLOBAL ALERT: Forget Global Warming, Worry About The MAGNETOSPHERE - Earth's Magnetic Field Is COLLAPSING And It Could Affect The Climate, Wipe Out Power Grids and The End Of Life!
January 28, 2014 - EARTH's MAGNETOSPHERE - Deep within the Earth, a fierce molten core is generating a magnetic field capable of defending our planet against devastating solar winds.
The protective field extends thousands of miles into space and its magnetism affects everything from global communication to animal migration and weather patterns.
But this magnetic field, so important to life on Earth, has weakened by 15 per cent over the last 200 years. And this, scientists claim, could be a sign that the Earth’s poles are about to flip.
Experts believe we're currently overdue a flip, but they're unsure when this could occur.
If a switch happens, we would be exposed to solar winds capable of punching holes into the ozone layer.
The impact could be devastating for mankind, knocking out power grids, radically changing Earth’s climate and driving up rates of cancer.
The Earth's climate would change drastically. In fact, a recent Danish study believes global warming is directly related to the magnetic field rather than CO2 emissions.
The study claimed that the planet is experiencing a natural period of low cloud cover due to fewer cosmic rays entering the atmosphere.
Radiation at ground level would also increase, with some estimates suggesting overall exposure to cosmic radiation would double causing more deaths from cancer.
Researchers predict that in the event of a flip, every year a hundred thousand people would die from the increased levels of space radiation.
'Radiation could be 3-5 times greater than that from the man-made ozone holes. Furthermore, the ozone holes would be larger and longer-lived,' said Dr Colin Forsyth from the Mullard Space Science Laboratory at UCL.
The magnetosphere is a large area around the Earth produced by the planet’s magnetic field. It presence means that charged particles of the solar wind are unable to cross the magnetic field lines and are deflected around the Earth.
Space agencies are now taking the threat seriously. In November, three spacecraft were launched as part of the SWARM mission to uncover how the Earth’s magnetic field is changing.
WHAT IS GEOMAGNETIC REVERSAL?
The Earth’s magnetic field is in a permanent state of change. Magnetic north drifts around and every few hundred thousand years the polarity flips so a compass would point south instead of north. The strength of the magnetic field also constantly changes and currently it is showing signs of significant weakening.
The Earth magnetic field is mainly generated in the very hot molten core of the planet. The magnetic field is basically a dipole (it has a North and a South Pole). Magnetic reversal or flip is the process by which the North Pole is transformed into the South and vice versa, typically following a considerable reduction in the strength of the magnetic field. However, weakening of the magnetic field does not always result in a reversal.
During a reversal, scientists expect to see more complicated field pattern at the Earth's surface, with perhaps more than one North and South Pole at any given time. The overall strength of the field, anywhere on the Earth, may be no more than a tenth of its strength now.
By examining pottery from prehistory to modern times, scientists have discovered just how dramatically the field has changed in the last few centuries.
They’ve found that Earth’s magnetic field is in a permanent state of flux. Magnetic north drifts and every few hundred thousand years the polarity flips so a compass would point south instead of north.
If the magnetic field continues to decline, over billions of years, Earth could end up like Mars - a once oceanic world that has become a dry, barren planet incapable of supporting life.
WHAT ARE THE DANGERS OF A MAGNETIC FLIP?
Life has existed on the Earth for billions of years, during which there have been many reversals.
There is no obvious correlation between animal extinctions and those reversals. Likewise, reversal patterns do not have any correlation with human development and evolution.
It appears that some animals, such as whales and some birds use Earth's magnetic field for migration and direction finding.
Since geomagnetic reversal takes a number of thousands of years, they could well adapt to the changing magnetic environment or develop different methods of navigation.
Radiation at ground level would increase, however, with some estimates suggesting that overall exposure to cosmic radiation would double causing more deaths from cancer. ‘But only slightly,’ said Professor Richard Holme.
‘And much less than lying on the beach in Florida for a day. So if it happened, the protection method would probably be to wear a big floppy hat.’
Electric grid collapse from severe solar storms is a major risk. As the magnetic field continues to weaken, scientists are highlighting the importance off-the grid energy systems using renewable energy sources to protect the Earth against a black out.
'The very highly charged particles can have a deleterious effect on the satellites and astronauts,' added Dr Mona Kessel, a Magnetosphere discipline scientist at Nasa.
In one area, there is evidence that a flip is already occurring. ‘The increasing strength of the South Atlantic anomaly, an area of weak field over Brazil, is already a problem,’ said Professor Richard Holme.
The Earth's climate could also change. A recent Danish study has found that the earth's weather has been significantly affected by the planet's magnetic field.
They claimed that fluctuations in the number of cosmic rays hitting the atmosphere directly alter the amount of cloud covering the planet.
Henrik Svensmark, a weather scientist at the Danish National Space Centre who led the team behind the research, believes that the planet is experiencing a natural period of low cloud cover due to fewer cosmic rays entering the atmosphere.
If a flip occurs, it would cause the Earth’s magnetic shield to be weakened for thousands of years, opening up our defences and causing cosmic radiation to get through.