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Message:

> Another part of our magnetic protective shield:
> 
> https://www.sciencealert.com/giant-magnetic-waves-have-been-discovered-oscillating-around-earth-s-core?utm_source=ScienceAlert+-+Daily+Email+Updates&utm_campaign=393e0b0e62-MAILCHIMP_EMAIL_CAMPAIGN&utm_medium=email&utm_term=0_fe5632fb09-393e0b0e62-366098385
> 
> "scientists studying satellite data of Earth have identified something inside Earth we've never seen before: a new type of magnetic wave that sweeps around the surface of our planet's core, every seven years.
> 
> "This discovery could offer insight into how Earth's magnetic field is generated, and provide clues of our planet's thermal history and evolution – that is, the gradual cooling of the planetary interior.
> 
> ***
> 
> "'We combined satellite measurements from Swarm, and also from the earlier German Champ mission and Danish Ørsted mission, with a computer model of the geodynamo to explain what the ground-based data had thrown up – and this led to our discovery."
> 
> "Earth's magnetic field is the subject of much fascination for scientists. Research to date suggests that the invisible structure forms a protective 'bubble' around our planet, keeping harmful radiation out and the atmosphere in, thus allowing life to thrive.
> 
> "But the magnetic field isn't static. It fluctuates in strength, size, and shape, has features we don't understand, and is gradually weakening over time.
> 
> "The reason that activity inside our planet is important is because that's where the magnetic field comes from. It's generated by a dynamo – a rotating, convecting, and electrically conducting fluid that converts kinetic energy into magnetic energy, spinning a magnetic field out into space around the planet.
> 
> "That fluid is (mostly) the molten iron inside Earth's outer core.
> 
> ***
> 
> "These waves, known as magneto-Coriolis waves, are huge magnetic columns aligned along Earth's rotational axis, strongest at the equator.
> 
> "They sweep around the boundary between the core and the mantle with an amplitude of around 3 kilometers (1.86 miles) per year, and move westward at a rate of up to 1,500 kilometers (932 miles) per year.
> 
> "'Their existence suggests that other magneto-Coriolis waves might exist with different oscillation periods, which we are unable to detect to date, due to a lack of data.
> 
> "'Magnetic waves are likely to be triggered by disturbances deep within the Earth's fluid core, possibly related to buoyancy plumes," Gillet says.
> 
> "'Our research suggests that other such waves are likely to exist, probably with longer periods – but their discovery relies on more research.'"
> 
> Comment: the magnetic field is our important protection from nasty rays outside Earth, that would kill all life