The Corona

The Corona - The Corona Outermost part of solar atmosphere...

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The Corona Outermost part of solar atmosphere Outflow as solar wind Visible during total eclipse Moon: Natural coronagraph o We see the sun and moon as the same size – therefore we get solar eclipses o Won’t be possible in 10000 to 20000 years because the moon is moving further away Appears bright in Xray images where magnetic field traps hot gas Temp of corona about 4 million degrees The sun from visible(5000K) to UV(10000K) to X-ray (1mil K) Granules Regions where the hot solar plasma rises up, cools off, and sinks back into the interior Sunspots Cooler than other parts of the sun’s surface Vary in number from maximum to minimum to maximum every 11 years Every 22 years the polarity of sunspots reverses Subphotospheric Convection: subsurface electric currents produce magnetic fields Hot materials rising, cool material sinking, up and down motion generates a magnetic field Solar magnetic activity Motions of plasma = charged particles in solar interior
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The Corona - The Corona Outermost part of solar atmosphere...

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