Ch. 1 Sec. 3Magnetic Earth

compass•device that has a magnetized needle that can spin freely

Just like a bar magnet, Earth has a magnetic field surrounding it and 2 magnetic poles.

Circulation of molten material in Earth’s core causes Earth’s magnetism

Earth’s magnetic field 2:04

• in northern Canada- about 1,250 km from geographic North Pole

magnetic North Pole

magnetic declination• angle between geographic north

and the north to which a compass needle points

Earth produces strong magnetic field can make magnets from

ferromagnetic materials

Van Allen belts• 2 doughnut shaped regions located

1,000 - 25,000 km above Earth’s surface

• contain electrons & protons traveling at very high speeds

solar wind

• stream of electrically charged particles flowing at high speeds from the sun

The Solar Wind [00:38]

magnetosphere

• region of Earth’s magnetic field shaped by the solar wind

• glowing region caused glowing region caused by charged particles by charged particles from Sunfrom Sun

auroraaurora

• northern hemisphere= northern hemisphere= Northern Lights Northern Lights (aurora (aurora

borealis)borealis)• southern hemisphere= southern hemisphere= Southern Lights (aurora Southern Lights (aurora

australis)australis)

The Northern Lights: Aurora Borealis [01:59]

magnetosphere

• region of Earth’s magnetic field shaped by the solar wind

magnetic declination• angle between geographic north

and the north to which a compass needle points

How are Earth and a bar magnet similar?

• Both have a magnetic field surrounding it and two magnetic poles.

• glowing region caused glowing region caused by charged particles by charged particles from Sunfrom Sun

auroraaurora

Van Allen belts• 2 doughnut shaped regions located

1,000 - 25,000 km above Earth’s surface

• contain electrons & protons traveling at very high speeds

compass•device that has a magnetized needle that can spin freely

• northern hemisphere= northern hemisphere= Northern Lights Northern Lights

aurora borealisaurora borealis