MrGaribaldi
Posts: 2,488 +1
By CNN:
The North Magnetic Pole could soon abandon Canada, migrate north of Alaska and eventually wind up in Russia, according to a Canadian scientist.
Read the rest here
By CNN:
The North Magnetic Pole could soon abandon Canada, migrate north of Alaska and eventually wind up in Russia, according to a Canadian scientist.
Does that have effect on the magnetic poles though?Originally posted by setscrew
The wobble referred to earlier is called Chandler's wobble. The Earth does not rotate perfectly about its axis. Much like a top that slowly degrades in its gyroscopic balance, the Earth shimmies a bit around it axis. The approximate period of this wobble is 1.2 years.
yes, most of the time. But the poster and the subject do play a role in whether I read it or not.Originally posted by boeingfixer
As a quick question, do you people read long posts ??
Just curious.
Originally posted by SNGX1275
yes, most of the time. But the poster and the subject do play a role in whether I read it or not.
Yes I did. Learned something from it too. I did not know what those numbers stood for.Originally posted by boeingfixer
Ok fair enough SNGX1275, Did you read my post ??
from Universers by Freedman and Kaufmann
The Earths magnetic field is similar to that of a bar magnet. The consensus among geologists is that this magnetic field is caused by electric currents flowing in the outer, liquid portions of the Earth's iron core. As material deep in the liquid core cools and solidifies to join the solid portion of the core, it releases the energy needed to stir up the motion of the remaining liquid material.
Our planet's rotation helps to sustain these currents, which produce a magnetic field that dominates space for tens of thousands of kilometers in all directions.
...
By analyzing samples of igneous rock of dirfferent ages from around the world, geologists hae found that the earth's magnetic field actually flips over and reverse direction on an irregular schedule ranging from tens of thousands to hundred of thousands of years... As an example, lava that solidified 30,000 years ago is magnetied in the opposite direction of lava solidified recently. Therefore, 30,000 years agoa compass needle would have pointed south, instead of north!
Yes. If the thread interests me, I read it all.Originally posted by boeingfixer
As a quick question, do you people read long posts ??
Just curious.
Originally posted by T-Shirt
there are also the 23,000 year, and 100,000 year wobbles
has to do with the tilt of the earth in relation to the sun
Ice ages, etc. etc.
http://oceanworld.tamu.edu/students/iceage/iceage2.htm
These are a little slow to effect airplanes.
I don't think it actually cools to solidify, its more of just the insane pressure down that deep doesn't allow material to be liquid.From Mr. Garibaldi's post:
from Universers by Freedman and Kaufmann
The Earths magnetic field is similar to that of a bar magnet. The consensus among geologists is that this magnetic field is caused by electric currents flowing in the outer, liquid portions of the Earth's iron core. As material deep in the liquid core cools and solidifies to join the solid portion of the core, it releases the energy needed to stir up the motion of the remaining liquid material.
...
By analyzing samples of igneous rock of dirfferent ages from around the world, geologists hae found that the earth's magnetic field actually flips over and reverse direction on an irregular schedule ranging from tens of thousands to hundred of thousands of years... As an example, lava that solidified 30,000 years ago is magnetied in the opposite direction of lava solidified recently. Therefore, 30,000 years agoa compass needle would have pointed south, instead of north!
Well it was what we were talking about, we just got sidetracked. If you look at my first post in this thread:Originally posted by Rick
This isn't quite what you are talking about, but speaking of magnetic poles...
I read awhile back that every so often in the span of many, many tens of thousands of years, the Earth is supposed to "flip" it's magnetic poles. This is called "polar shifting" and supposedly can be quite dangerous to living organisms because the magnetic field that surrounds Earth is rendered useless for a span of days to years.
Originally posted by SNGX1275:
I havent' read the artical yet. But yes the magnetic poles do wander some and it also switches polarity every once in a while. Meaning that a compass would point the wrong way. You can use magnetostratigraphy to determine sea floor spreading rates.
note: I've had classes on this stuff.