It consists of electrically charged particles such as electrons and protons. These charged particles are pushed out into space Hørpu Rima - Aurora Borealis (6) - Harpa (CD speeds exceeding kilometers miles per second. When they reach the Earth, they interact with its magnetic field and atmosphere to create beautiful northern and southern lights, which are brightly visible in the night skies of the polar regions.
In the Northern Hemisphere, these dancing lights are called northern lights or aurora borealisand in the Southern Hemisphere, they are called southern lights or aurora australis. The following picture shows typical northern lights over Alaska:. What creates the different colors of auroras?
Electron collisions excite gas molecules in the Earth's atmosphere, and when these molecules return Hørpu Rima - Aurora Borealis (6) - Harpa (CD to their normal state, they emit photons, or packets of energy in the form of light waves. More colors are generated when these lights blend. The altitude of auroral activity varies from about 96 to kilometers 60 and miles above the sea-level, and the voltage of the electrical fields generated during the activity can range from about 40, tovolts.
The output of the Sun's energy peaks every 9 to 14 years. On an average it peaks every 11 years. The peak solar activity is called a solar max. Horseback Battle Hammer. Info Connections Comments Shares.
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