Astronomy Question: When did the Earth become a polar magnet? - GoFuckYourself.com

TheFLY · 05-16-2003, 07:03 AM

I was looking at the lunar eclipse last night -- cool shit... but then I started wondering about the Earth's magnetic field... Sure the icecaps are probably based on exposure to light... and the Earth has an iron core? And the magnetic polarity of Earth changes every 100,000 years or some shit -- but I still don't know how the fucking Earth got magnetized...

I remember in 1st grade I made an electromagnet -- a big nail with a coil of wire and a big ass battery... Did somebody wrap a big wire around the earth -- magnetized it -- and then vanished into space?

BV · 05-16-2003, 07:07 AM

from rotating around the sun at a high rate of speed

goBigtime · 05-16-2003, 07:08 AM

Move along.. nothing to see here.

TheFLY · 05-16-2003, 07:14 AM

Quote:

Originally posted by BV
from rotating around the sun at a high rate of speed

So we are in the Sun's magnetic field right now?

BV · 05-16-2003, 07:20 AM

Quote:

Originally posted by TheFLY

So we are in the Sun's magnetic field right now?

I'm not, I live on Kapac.

lyno · 05-16-2003, 07:23 AM

looks like the "Sun's magnetic field" theory is right:

http://www.phy6.org/earthmag/NSTA1C.htm

PostWhore · 05-16-2003, 07:24 AM

oook....earth got magnetic field, from all the meltod iron beneath earth crust, which is rotating, and creating magnetic field

d0se · 05-16-2003, 07:25 AM

doesnt answer the question but i found this interesting tidbit...

While the core of the earth is made of iron, it cannot be magnetic because it is so hot. What Gilbert didn't know is that when iron is heated up hot enough it loses all of its magnetism, the temperature of a material where it loses its ferromagnetism is known as its curie point. For iron the curie point is 770 °C. The iron inside the earth is much hotter than 770 °C and so cannot be an iron magnet.

hmm so what IS magnetised? =[

PostWhore · 05-16-2003, 07:28 AM

but the molten iron keeps rotating and moving all the time, it is al about the friction!!

Quote:

Originally posted by d0se
doesnt answer the question but i found this interesting tidbit...

While the core of the earth is made of iron, it cannot be magnetic because it is so hot. What Gilbert didn't know is that when iron is heated up hot enough it loses all of its magnetism, the temperature of a material where it loses its ferromagnetism is known as its curie point. For iron the curie point is 770 °C. The iron inside the earth is much hotter than 770 °C and so cannot be an iron magnet.

hmm so what IS magnetised? =[

PostWhore · 05-16-2003, 07:28 AM

no friction - no satisfaction

d0se · 05-16-2003, 07:31 AM

hmm.... this is also interestin

. Lava includes hot, iron-containing minerals such as basalt, which can be magnetized. As the lava cools it locks in the direction of the magnetic field of the earth. This locks in the latitude at which the lava cooled. On Aneroid peak in eastern Oregon there are lava layers which preserve horizontal magnetic fields. This means that those lavas cooled near the equator. Continental drift has moved them far north to where they are today in Oregon.

d0se · 05-16-2003, 07:33 AM

oo and..

Light is Electromagnetic Radiation

Faraday's discoveries provided the basis from which James Clerk Maxwell created the theory of electromagnetism and discovered that light was electromagnetic radiation

05-16-2003, 07:03 AM	#1
TheFLY So Fucking Banned Join Date: Jan 2001 Location: http://www.thefly.net/ --- Quit your job and live off steady traffic. Posts: 11,856	Astronomy Question: When did the Earth become a polar magnet? I was looking at the lunar eclipse last night -- cool shit... but then I started wondering about the Earth's magnetic field... Sure the icecaps are probably based on exposure to light... and the Earth has an iron core? And the magnetic polarity of Earth changes every 100,000 years or some shit -- but I still don't know how the fucking Earth got magnetized... I remember in 1st grade I made an electromagnet -- a big nail with a coil of wire and a big ass battery... Did somebody wrap a big wire around the earth -- magnetized it -- and then vanished into space?

05-16-2003, 07:24 AM	#7
PostWhore Confirmed User Industry Role: Join Date: Jan 2003 Posts: 4,720	oook....earth got magnetic field, from all the meltod iron beneath earth crust, which is rotating, and creating magnetic field __________________ Ask me how to monetize with adult traffic!

05-16-2003, 07:28 AM	#10
PostWhore Confirmed User Industry Role: Join Date: Jan 2003 Posts: 4,720	no friction - no satisfaction __________________ Ask me how to monetize with adult traffic!

05-16-2003, 07:07 AM	#2
BV wtf Industry Role: Join Date: Sep 2001 Location: Bikini State, FL USA Posts: 10,914	from rotating around the sun at a high rate of speed

05-16-2003, 07:08 AM	#3
goBigtime Confirmed User Join Date: Nov 2002 Posts: 7,761	Move along.. nothing to see here.

05-16-2003, 07:23 AM	#6
lyno Confirmed User Industry Role: Join Date: May 2003 Location: On my way to Sirius1 Posts: 474	looks like the "Sun's magnetic field" theory is right: http://www.phy6.org/earthmag/NSTA1C.htm

05-16-2003, 07:25 AM	#8
d0se Confirmed User Join Date: Jul 2002 Location: Western Australia Posts: 1,225	doesnt answer the question but i found this interesting tidbit... While the core of the earth is made of iron, it cannot be magnetic because it is so hot. What Gilbert didn't know is that when iron is heated up hot enough it loses all of its magnetism, the temperature of a material where it loses its ferromagnetism is known as its curie point. For iron the curie point is 770 °C. The iron inside the earth is much hotter than 770 °C and so cannot be an iron magnet. hmm so what IS magnetised? =[

05-16-2003, 07:31 AM	#11
d0se Confirmed User Join Date: Jul 2002 Location: Western Australia Posts: 1,225	hmm.... this is also interestin . Lava includes hot, iron-containing minerals such as basalt, which can be magnetized. As the lava cools it locks in the direction of the magnetic field of the earth. This locks in the latitude at which the lava cooled. On Aneroid peak in eastern Oregon there are lava layers which preserve horizontal magnetic fields. This means that those lavas cooled near the equator. Continental drift has moved them far north to where they are today in Oregon.

05-16-2003, 07:33 AM	#12
d0se Confirmed User Join Date: Jul 2002 Location: Western Australia Posts: 1,225	oo and.. Light is Electromagnetic Radiation Faraday's discoveries provided the basis from which James Clerk Maxwell created the theory of electromagnetism and discovered that light was electromagnetic radiation