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In case anyone reading this doesn't know what one is...a dynamo is an electric generator. At its simplest form, you can rotate copper wire between magnets and you'll create electricity. In a larger man-made form you can think of hydroelectric dams where the water turns turbines to create electricity. A by product of that dynamo is magnetism.
Now let's take a quick look at the Earth and the Sun with a dynamo in mind.
Under the Earth's crust is molten magma that flows around a solid core...a ball of solid metal in other words. That flow creates a mile wide current of electricity, just like a simple rotating dynamo can produce electricity. That electricity produces magnetism that escapes at the poles and shelters this planet from cosmic radiation. Could there be a profound reason why this happens to be how the Earth is constructed or is it just blind chance? I'll relate the following and let you decide:
From the "Secrets Of The Sun" episode on the PBS' show NOVA :
KAREL SCHRIJVER: We've essentially learned that it takes two things to make a star magnetic. It needs to have these convective motions right underneath the surface: the bubbling of the gas; it needs to spin. And the faster it spins, the more active it becomes, and wherever those two things, the bubbling and the spinning, can interact, that's where we see the strongest magnetic activity in stars.
NARRATOR: Astronomers know that the surface of the sun spins in a strange way. Travel from the poles of the sun towards its equator and you'd notice it turns faster. Analyzing sound waves inside the sun reveals that the plasma layers beneath the surface also spin at different speeds. That's because they act like fluid, which gets denser towards the core. The interior of the sun is a place of spectacular turmoil, turmoil that's the key to the sun's magnetism.
TODD HOEKSEMA: The motions there, the convection, the differential rotation, the motion from equator to pole are driving a new force. They're driving a magnetic field. There's a dynamo at work here, a dynamo that's generating a force that we actually experience here on the earth.
NARRATOR: It works like a giant wind turbine: churning plasma in the convection zone stirs up powerful electrical currents, which generate a huge magnetic field.
NARRATOR: The Holy Grail for scientists is understanding exactly how this dynamo generates solar storms.
Man once oohed and aahed at the first simple dynamo and modern turbines are lauded as an example of Man's ingenuity and creativity. Compare that with the Earth, that is in reality, a magma fueled electric generator and the Sun which is a nuclear fusion fueled electric generator. Life wouldn't exist on Earth without either of those cosmic dynamos. I don't see it as blind chance.
Now let's take a quick look at the Earth and the Sun with a dynamo in mind.
Under the Earth's crust is molten magma that flows around a solid core...a ball of solid metal in other words. That flow creates a mile wide current of electricity, just like a simple rotating dynamo can produce electricity. That electricity produces magnetism that escapes at the poles and shelters this planet from cosmic radiation. Could there be a profound reason why this happens to be how the Earth is constructed or is it just blind chance? I'll relate the following and let you decide:
From the "Secrets Of The Sun" episode on the PBS' show NOVA :
KAREL SCHRIJVER: We've essentially learned that it takes two things to make a star magnetic. It needs to have these convective motions right underneath the surface: the bubbling of the gas; it needs to spin. And the faster it spins, the more active it becomes, and wherever those two things, the bubbling and the spinning, can interact, that's where we see the strongest magnetic activity in stars.
NARRATOR: Astronomers know that the surface of the sun spins in a strange way. Travel from the poles of the sun towards its equator and you'd notice it turns faster. Analyzing sound waves inside the sun reveals that the plasma layers beneath the surface also spin at different speeds. That's because they act like fluid, which gets denser towards the core. The interior of the sun is a place of spectacular turmoil, turmoil that's the key to the sun's magnetism.
TODD HOEKSEMA: The motions there, the convection, the differential rotation, the motion from equator to pole are driving a new force. They're driving a magnetic field. There's a dynamo at work here, a dynamo that's generating a force that we actually experience here on the earth.
NARRATOR: It works like a giant wind turbine: churning plasma in the convection zone stirs up powerful electrical currents, which generate a huge magnetic field.
NARRATOR: The Holy Grail for scientists is understanding exactly how this dynamo generates solar storms.
Man once oohed and aahed at the first simple dynamo and modern turbines are lauded as an example of Man's ingenuity and creativity. Compare that with the Earth, that is in reality, a magma fueled electric generator and the Sun which is a nuclear fusion fueled electric generator. Life wouldn't exist on Earth without either of those cosmic dynamos. I don't see it as blind chance.
