Our planet is a giant magnet The core of the Earth is not a permanent magnet The motion of the molten iron and nickel creates electric currents, which.

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Presentation transcript:

Our planet is a giant magnet The core of the Earth is not a permanent magnet The motion of the molten iron and nickel creates electric currents, which produce a magnetic field-similar to an electromagnet

/norway-aurora-borealis-vin?source=relatedvideo Aurora Borealis

Low and High levels of auroras

Aurora Borealis The Northern Lights are also called the aurora borealis for Northern Dawn The Southern Lights are the aurora australis for Southern Dawn

Solar Winds Solar winds stream away from the sun at speeds of about 1 million miles per hour. They reach the earth, some 40 hours after leaving the sun

Magnetosphere-earth’s magnetic field

Sun Flares Over 98% of the charged particles from the Sun and from galactic cosmic rays that strike Earth's magnetosphere are deflected by it But astronauts and satellites in space are vulnerable

1859- largest auroras (solar storm recorded in history, induced electricity in the telegraph wires) Boston operator (to Portland operator): "Please cut off your battery [power source] entirely for fifteen minutes." Portland operator: "Will do so. It is now disconnected." Boston: "Mine is disconnected, and we are working with the auroral current. How do you receive my writing?" Portland: "Better than with our batteries on. – Current comes and goes gradually." Boston: "My current is very strong at times, and we can work better without the batteries, as the aurora seems to neutralize and augment our batteries alternately, making current too strong at times for our relay magnets. Suppose we work without batteries while we are affected by this trouble." Portland: "Very well. Shall I go ahead with business?" Boston: "Yes. Go ahead."

ustralis The aurora is the only visible evidence that the Sun and the Earth are a system connected by more than sunlight.

Van Allen radiation belts discovered in 1958 aka magnetosphere The particles from the solar wind follow the lines of magnetic force generated by the earth's core and flow through the magnetosphere a teardrop- shaped area of highly charged electrical and magnetic fields.

Why auroras are different colors