Changes

An aurora ([[Latin]] for "dawn"), or polar aurora, is a glow in the sky, seen often in a ring-shaped region around the [[magnetic pole]]s ("auroral zone") and occasionally further equatorward.  Auroras occur at both [[magnetic pole]]s of the Earth.  In the northern hemisphere, the phenomenon is referred to as the aurora borealis or the "northern lights".  In the southern hemisphere, it is called the aurora australis.

An '''aurora''' ([[Latin]] for "dawn"), or polar aurora, is a glow in the sky, seen often in a ring-shaped region around the [[magnetic pole]]s ("auroral zone") and occasionally further equatorward.  Auroras occur at both [[magnetic pole]]s of the Earth.  In the northern hemisphere, the phenomenon is referred to as the aurora borealis or the "northern lights".  In the southern hemisphere, it is called the aurora australis.

Charged, energized particles from the sun, called the [[solar wind]], are captured by the Earth's magnetic field.  The particles collide with [[atom]]s in the upper [[atmoshpere]], causing the [[atom]]s to become energized.  These energized [[atom]]s then release their excess energy as light.   

Charged, energized particles from the sun, called the [[solar wind]], are captured by the Earth's magnetic field.  The particles collide with [[atom]]s in the upper [[atmoshpere]], causing the [[atom]]s to become energized.  These energized [[atom]]s then release their excess energy as light.   

Auroras typically occur 100 km (60 miles) above ground.  

Auroras typically occur 100 km (60 miles) above ground.  

[[Category:Physics]]

[[Category:Physics]]