Dating magnetic field
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About 41, years ago, something remarkable happened: Earth's magnetic field flipped and, for a temporary period, magnetic north was south and magnetic south was north. Palaeomagnetists refer to this as a geomagnetic excursion. This event, which is different to a complete magnetic pole reversal, occurs irregularly through time and reflects the dynamics of Earth's molten outer core. The strength of Earth's magnetic field would have almost vanished during the event, called the Laschamp excursion, which lasted a few thousand years. Earth's magnetic field acts as a shield against high-energy particles from the Sun and outside the solar system.
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Earth's magnetic field flipped 42, years ago, creating a climate 'disaster' | Live Science
A compass tells you what direction is 'North', but have you ever wondered how it can do that? Every magnet produces an invisible area of influence around itself. When things made of metal or other magnets come close to this region of space, they feel a pull or a push from the magnet. You can make magnetic fields visible to the eye by using iron chips sprinkled on a piece of paper with a magnet underneith. On the Sun, our nearest star, you can see the same kinds of magnetic fields as they pop out of the surface of the sun. This picture shows the lines of magnetism near a sunspot. We can see these loops of magnetism on the sun because very hot gases flow along them and light them up!
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42,000-Year-Old Trees Enable Accurate Analysis of Earth’s Last Magnetic Field Reversal
Something big is about to happen on the sun. According to measurements from NASA-supported observatories, the sun's vast magnetic field is about to flip. The sun's magnetic field changes polarity approximately every 11 years.
And this patch is growing. Underneath the surface, at the core-mantle boundary, it appears there are patches where the field has actually flipped polarity — the field is reversed. If this were to happen, electrical grid s and satellite technologies would be at risk. But the field is more complicated than that. As these patches wax and wane, they affect the field as a whole — sometimes even causing the magnetic north and south poles to flip entirely , which happens every million years or so.