Archive - Aug 26, 2018

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Speedy flip in Earth's magnetic field could cause trillions in damage, scientists warn
A new study of previous reversals of Earth's magnetic field has found a rapid shift occurred within two centuries — a discovery that has prompted researchers to warn of a potential dire scenario.

According to a team of international scientists, including from the Australian National University (ANU), such an event in the future would increase our planet's exposure to the Sun's radiation, and could cause trillions of dollars in damage by decimating power and communications systems across the globe.

The Earth has a magnetic field that scientists believe is generated by motion in the planet's core. It's what gives us our north and south poles and powers compasses.

We've known for more than a century that our planet's magnetic field has been weakening at a rate of about five per cent a century, prompting concerns that the Earth's magnetic poles could soon flip - an event that could have potentially disastrous results for life on Earth.

From the electrical grids that power our computers to the satellites that let us watch TV, many facets of our lives depend on the Earth's magnetic field. It also acts like an invisible force field protecting Earth from solar winds and harmful cosmic radiation.

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Image courtesy New Zealand Herald