How Earth's magnetic field is changing
The European Space Agency (ESA) launched its trio of Earth-facing satellites – the Swarm satellites – more than two years ago. Since then, the three probes have been tirelessly making measurements of the Earth's magnetic field, mapping it out in detail. Now, that data has been used in a new study of how the magnetic field has changed over recent years, with the results echoing what's happening at the planet's core.
Earth's magnetic field might be invisible, but it's complex and ever-changing, protecting us from cosmic radiation and solar winds. Since launching at the tail end of 2013, ESA's Swarm satellites have been studying the different magnetic signals from the planet's core, mantle, crust, oceans, all the way out to the ionosphere and magnetosphere.
All that data was recently used in a study to describe where the magnetic field is getting weaker, where it's strengthening, and perhaps most importantly – how fast those changes are occurring. The findings are presented at the Living Planet Symposium, which is being held this week, and include two animations showing the changes.
The first animation, which also makes use of data from CHAMP and Ørsted satellites, shows changes in field strength between 1999 and May 2016. The red regions are where it got stronger, while the blue regions show a weakening.
Overall, the magnetic field has weakened by some 3.5 percent over North America, but has become around 2 percent stronger over Asia. The absolute weakest area of the field, known as the South Atlantic Anomaly, also weakened by some 2 percent as it moved steadily to the west.
The second animation is a little different, describing the rate of change between 2000 and 2015. Similar to the first animation, slowing regions are seen in blue, while those speeding up are visible in red. It's a complex picture, with changes increasing in speed over Asia, while they slow down around South Africa.
What's causing all of those changes? Well, the magnetic field is thought to be the result of the vast quantities of molten iron moving around some 3,000 km (1,860 miles) beneath the surface. The changes, it's thought, are caused by alterations in how the liquid is flowing.
"Swarm data are now enabling us to map detailed changes in Earth's magnetic field, not just at Earth's surface but also down at the edges of its source region in the core," said senior scientist Chris Finlay. "Unexpectedly, we are finding rapid localised field changes that seem to be a result of accelerations of liquid metal flowing within the core."
As they continue to move through their third year of taking measurements, the Swarm satellites will continue to study the magnetic field. In so doing, they will continue to provide valuable insights into how the field is changing, while helping us to improve our understanding of what drives those changes.
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Temperature is going to be the main driving force in the flow, and change of the Core with a correlation to the Suns, and other Cosmic Flows will contribute to the change and alteration of patterns within the magnetic fields within the Planet, the Core and the magnetic field lines that flow from the Core, through the crust (cause of lava tubes and volcanos and "hot spots" ) and all the way out into space, with concentrated naturally occurring focal points or intersecting lines will be revealed (Geometry)
As the planet gets hotter and hotter, the more room there is for the water in the ocean to occupy - thus, even though sea level rise is not currently concerning, the increase of surface temperatures will still wreck havoc on surface conditions including sea level rise
Unchecked this could all pop into a popcorn like scenario, but mankind will by this time already be fully aware of the situation and preparations will already be decades or possibly even centuries in the planning...
The Science is simple - Keep an Eye on Space!
First thing you see is the Magnetic Lines of interaction of Earth's Core, Crust and through out into Space - to the Sun, and other Planets and Cosmic Conditions and Events, and on out from their
Oh My Oh My Keep An Eye On Space, Ohh My!
Orion Michael Guy
Many atmospheric researchers argued at the time, that we had NO data prior to the launch of ozone detecting satellites, and that we did not know if there was a cycle of some sort at play. Many thought that the ozone hole would go away simply from the actions of the Sun.
Add to that the fact that banning CFCs in the US would have taken MANY years to alter the chemistry of the atmosphere over ANTARCTICA, it is unlikely that what we have seen is related in any way.