“Opposites attract and likes repel.”

A. Properties of Magnetism Magnetism is the attraction or repulsion of magnetic materials Magnets attract iron and materials that contain iron Magnets attract and repel other magnets In addition, one part of a magnet will always point north when allowed to swing freely

Magnetic properties depend on the structure of its atomsatoms StructureStructure of an atom:

Magnets can be made, destroyed or broken Magnets can be made by placing a ferromagnetic materials into a strong magnetic field Magnets can be destroyed by dropping, hitting or heating Magnets can be broken, but keep magnetic propertiesproperties

Earth has a magnetic field and 2 magnetic poles Earth’s core- Earth’s core- circulation of molten rock in outer core is related to Earth’s magnetism

Earth’s magnetic poles- they are located on Earth’s surface, where the magnetic force is the strongest. They are not aligned with the geographic poles.geographic poles. Magnetic Declination- the angle between geographic north and the north the compass needle points.

Since Earth has a strong magnetic field, Earth itself can make magnets out of ferromagnetic materials. Rock shows when Earth’s magnetic field was reversed through time.reversed

Earth’s magnetic field affects the movement of electrically charged particles in space.magnetic field Solar Wind- Solar Wind- a stream of electrically charged particles flowing at high speeds from the Sun.Sun.

Magnetosphere- the region of Earth’s field shaped by the solar wind. Aurora-Aurora- a glowing region caused by charged particlesglowing region particles

What is the purpose of the THEMIS MISSION? How will the information they gather help us?