1. Learning Targets I can explain how the Earth’s magnetic field protects from harmful radiation. The Sun Vocabulary Magnetosphere Gauss Declination

3. Wavelengths filtered by atmosphere: Gamma X-rays Ultraviolet Infrared Microwaves

4. Earth’s Magnetic Field The Earth's magnetic field is tilted 11 degrees from the spin axis of the Earth. This is called declination. The Earth's core is too hot for the iron in it to be magnetic. So how did the Earth get its magnetic field?

5. Magnetic fields surround electric currents, so we think that circulating electric currents in the Earth's molten metallic core are the origin of the magnetic field. The magnetic field magnitude measured at the surface of the Earth is about half a Gauss and dips toward the Earth in the northern hemisphere. The magnitude varies over the surface of the Earth in the range 0.3 to 0.6 Gauss.

6. The Earth’s magnetic field repels many of the charged particles that make up the solar wind.

7. Films: Earth’s Magnetic Field & Auroras http://sohowww.nascom.nasa.gov/classroom/nor dlys_english.mp4http://sohowww.nascom.nasa.gov/classroom/nor dlys_english.mp4

8. Learning Targets Vocabulary Specific Heat Heat Capacity