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www.sciencedaily.com...
Some 41,000 years ago, a complete and rapid reversal of the geomagnetic field occured. Magnetic studies of the GFZ German Research Centre for Geosciences on sediment cores from the Black Sea show that during this period, during the last ice age, a compass at the Black Sea would have pointed to the south instead of north.
What is remarkable is the speed of the reversal: "The field geometry of reversed polarity, with field lines pointing into the opposite direction when compared to today's configuration, lasted for only about 440 years, and it was associated with a field strength that was only one quarter of today's field," explains Norbert Nowaczyk. "The actual polarity changes lasted only 250 years. In terms of geological time scales, that is very fast." During this period, the field was even weaker, with only 5% of today's field strength. As a consequence, Earth nearly completely lost its protection shield against hard cosmic rays, leading to a significantly increased radiation exposure.
I have a feeling that where the pyramids are right now there will be those magnetic bubbles will be.
If our magnetic field collapses, there will be some places that will still have a magnetic field strong enough to support life. From these areas life will again rebound. They are areas where the dipoles of the magnetic field originate. I am not sure where these magnetic bubbles will be.
I am not worried,just presenting the facts.
Don't worry, it's not like it is the end of the world, it is not the end of society either unless we let it become that way.
Indeed CME's are dangerous,but a sudden magnetic pole reversal will certainly produce an EMP which will have the same effect ,even worse.
More damage (much more damage) is done by solar storms and the effects from CME's etc...it's these that will wipe out any unprotected or hardened electrical equipment...pole reversals are not that damaging to electrical systems.
Originally posted by piequal3because14
reply to post by MysterX
Indeed CME's are dangerous,but a sudden magnetic pole reversal will certainly produce an EMP which will have the same effect ,even worse.
More damage (much more damage) is done by solar storms and the effects from CME's etc...it's these that will wipe out any unprotected or hardened electrical equipment...pole reversals are not that damaging to electrical systems.
Plimer (2001) suggested that a rapid magnetic reversal could cause the failure of all electronic equipment worldwide and suggested the possible collapse of Western Civilisation. However, comparing the intensity of magnetic flux during the shortest magnetic reversals with that of existing magnetic flux systems such as solar and magnetic storms, offers no evidence that a magnetic reversal will substantially impact electronic or electrical technology.
This is a process that began almost 250 years ago and can stop very fast.
If there was a change in the earths polarity, im pretty sure people would be more concerned about the world seemingly imploding on itself, rather than not being able to charge their iphone. Then again...
You might be right because in those times no advanced technological civilization(s) were present on Earth.
Very long runs of electrical cable would probably be mostly affected and even then very little damage is estimated to happen judging by previous pole reversal evidence collected.
On the morning of September 1, 1859, amateur astrologer Richard Carrington ascended into the private observatory attached to his country estate outside of London. After cranking open the dome’s shutter to reveal the clear blue sky, he pointed his brass telescope toward the sun and began to sketch a cluster of enormous dark spots that freckled its surface. Suddenly, Carrington spotted what he described as “two patches of intensely bright and white light” erupting from the sunspots. Five minutes later the fireballs vanished, but within hours their impact would be felt across the globe.
That night, telegraph communications around the world began to fail; there were reports of sparks showering from telegraph machines, shocking operators and setting papers ablaze. All over the planet, colorful auroras illuminated the nighttime skies, glowing so brightly that birds began to chirp and laborers started their daily chores, believing the sun had begun rising. Some thought the end of the world was at hand, but Carrington’s naked eyes had spotted the true cause for the bizarre happenings: a massive solar flare with the energy of 10 billion atomic bombs. The flare spewed electrified gas and subatomic particles toward Earth, and the resulting geomagnetic storm—dubbed the “Carrington Event”—was the largest on record to have struck the planet.
The magnetosphere doesn't really protect us from CMEs (though it does protect the upper atmosphere). Actually, it is the magnetosphere which is responsible for geomagnetic storms. The charging and fluctuations of the Earth's magnetic field which are induced by CMEs produce ground currents in the earth. Those currents can cause severe problems with power transformers.
The real danger of the magnetic pole reversal is the weakening of the magnetosphere. The earth would be more at risk from CMEs when the earths shield is lowered....... that is my concern...... not that we will be hit by a full strength CME but a glancing blow while the pole change when the magnetosphere's strength is reduced....
By frequency and period of the wave.
How would a magnetic field reversal cause alternating current to stop working?
Originally posted by piequal3because14
reply to post by beezzer
By frequency and period of the wave.
How would a magnetic field reversal cause alternating current to stop working?
Those two things are inversely related. You specify one, you get the other. It's redundant to say both.
Originally posted by piequal3because14
reply to post by Bedlam
Those two things are inversely related. You specify one, you get the other. It's redundant to say both.
Frequency for current and period for the collector wave .