Horizon - earth core
Discussion
What a very good show really covered some highly advanced topics in a language which all could understand without dumbing it down too much.
Yet another excellent BBC production - I recall seeing it when I was a kid and it's just as good today. Well done.
Back to the episode specifically with respect to pole change and the fact there are already north poles on areas in the southern hemisphere. We now know there is a risk to Hubble and other space craft BUT more importantly to me - what risk does polar shift during Its transition and post transition to humans wildlife and vegetation?
Is it merely more than one north pole so migration in wildlife could cause the death of millions of animals and the aura in different parts of the sky unusual parts (northern lights)
Yet another excellent BBC production - I recall seeing it when I was a kid and it's just as good today. Well done.
Back to the episode specifically with respect to pole change and the fact there are already north poles on areas in the southern hemisphere. We now know there is a risk to Hubble and other space craft BUT more importantly to me - what risk does polar shift during Its transition and post transition to humans wildlife and vegetation?
Is it merely more than one north pole so migration in wildlife could cause the death of millions of animals and the aura in different parts of the sky unusual parts (northern lights)
Welshbeef said:
Back to the episode specifically with respect to pole change and the fact there are already north poles on areas in the southern hemisphere.
There are no north poles currently in the southern hemisphere.. If you mean previous poles as evidenced by the magnetism of certain rocks now located in the southern hemisphere, could this not be explained by plate tectonics?
Jollyclub said:
Welshbeef said:
Back to the episode specifically with respect to pole change and the fact there are already north poles on areas in the southern hemisphere.
There are no north poles currently in the southern hemisphere.. If you mean previous poles as evidenced by the magnetism of certain rocks now located in the southern hemisphere, could this not be explained by plate tectonics?
Eric Mc said:
No, the plates move about on the crust. The crust is continually replenished by upwelling at the mid-ocean ridges. As the crust forms it spreads out either side of the ridge. This crust locks in the direction of the earth's magnetism as the moment the new crust was formed on the ocean floor. Therefore, the evidence for the switching of the magnetic poles comes from this "fossilied" magentism in the ocean floor. It has nothing to do with the actual continental plates.
IIRC from university this is best shown at the join in mid Atlantic, the rock either side of the fault is striped alternatively north and south magnetised. Welshbeef said:
What a very good show really covered some highly advanced topics in a language which all could understand without dumbing it down too much.
Yet another excellent BBC production - I recall seeing it when I was a kid and it's just as good today. Well done.
Back to the episode specifically with respect to pole change and the fact there are already north poles on areas in the southern hemisphere. We now know there is a risk to Hubble and other space craft BUT more importantly to me - what risk does polar shift during Its transition and post transition to humans wildlife and vegetation?
Is it merely more than one north pole so migration in wildlife could cause the death of millions of animals and the aura in different parts of the sky unusual parts (northern lights)
Obviously you could google it to get scientific answers but as this is PH ill have a go. Yet another excellent BBC production - I recall seeing it when I was a kid and it's just as good today. Well done.
Back to the episode specifically with respect to pole change and the fact there are already north poles on areas in the southern hemisphere. We now know there is a risk to Hubble and other space craft BUT more importantly to me - what risk does polar shift during Its transition and post transition to humans wildlife and vegetation?
Is it merely more than one north pole so migration in wildlife could cause the death of millions of animals and the aura in different parts of the sky unusual parts (northern lights)
Migrating wildlife use the poles to navigate. Moving them mean they miss their migratory path and fail to breed and die off - effecting the whole food chain. This could mean more bugs eating crops, for example.
Solar radiation. These particles zip down the poles as explained in the program. I've seen a different program that stated that trans-polar flights are already monitored with regard to radiation levels. This would effect the areas where the pole would be moved.
Additionally, large geomagnetic storms already affect power grids (and associated transformers etc) through overloading inducted currents. At the poles, not normally a problem. As they move it can affect less protected power grids.
Weather patterns possibly....
Overall i think its the affect on wildlife that would be most devastating, not just on our moral (protect everything) compass, but on food supply and distribution.
Of course, these reversals have happened many times before and, in geo0logical terms, are rather frequent. They don't seem to be major triggers of serious extinction events.
Some migrating species might have a problem for a while but it does look that many migratory birds, for instnace, even though they may use a magnetic sense to work out which direction to fly, also use other merhods in parallel, such as astro-navigation and route memory.
So, I would expect that there might be some impact on migrating species, but it would not be a terminal blow.
Some migrating species might have a problem for a while but it does look that many migratory birds, for instnace, even though they may use a magnetic sense to work out which direction to fly, also use other merhods in parallel, such as astro-navigation and route memory.
So, I would expect that there might be some impact on migrating species, but it would not be a terminal blow.
Jollyclub said:
There are no north poles currently in the southern hemisphere..
If you mean previous poles as evidenced by the magnetism of certain rocks now located in the southern hemisphere, could this not be explained by plate tectonics?
Towards the end of the programme they showed a map of the globe with the magnetic fields it showed three areas within the southern hemisphere which had already turned north. The professor stated that this process started over 400 years ago and the transition of switching poles will see more and more of it until the point when there is a full switch. If you mean previous poles as evidenced by the magnetism of certain rocks now located in the southern hemisphere, could this not be explained by plate tectonics?
The issue in brazil Argentina and uraguay area is it's got a north magnetic pole currently which is what they found to be damaging the Hubble telescope as it was orbiting above the magnetic field ie smashed by particles.
This is somewhat different to what your stating. It is the latest info only just discovered. Not doubting you however if that is what professors who work exclusively in that area and who helped NASA out in solving the issue with Hubble or explaining why it was happening there is more substance to it.
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