The SUN - The Sun Phenomena of the Surface & Outer...

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Unformatted text preview: The Sun Phenomena of the Surface & Outer Atmosphere SUNSPOT T~ 5800 K GRANULES R ~ 1500 km Last~ 10 min PLAGE, FACULAE or FLARE FLARE E ~ 10 25 J ~ 100 /day PHOTOSPHERE Density~ 4x10-4 kg/ m 3 ~ 10-2 sea level P~ 0.1 bar CORONA Density~ 10- 11 kg / m 3 P~ 10 -13 bar CHROMOSPHERE Density~ 8x10- 4 kg/ m 3 P~ 10 -13 bar CORONAL TRANSIENT (visible in UV) 500 km /sec SOLAR WIND (visible in x-rays) ~ 400 km/sec T ~ 3.5 x 10 6 K T ~ 4000 K T ~ 8000 K T ~ 10,000 K (Balmer Lines) T ~ 20,000 K (He II Lines) T ~ 10 6 K (Fe XII Lines) SUPER GRANULES R ~ 30,000 km 10,000 km SPICULES (cool jets) height ~ 12,000 km Last~ 10 min SPECTRUM: Continuous weakly bound electron in H- ion SPECTRUM: Absorption (face on) Emission (edge on) SPECTRUM: continuous (photon scattering of dust and electrons) emission (hot, low pressure gas) QUIESCENT PROMENENCE Life times: days ERUPTIVE PROMENENCE Lifetimes: hours The Chromosphere The Chromosphere Outer region of sun surrounding and immediately above the photosphere. Thickness ................ ~ 10,000 km Color ...................... Red (from Balmer lines toward base) Pressure ................. 10-13 bar Temperature .......... 420 10 6 K base T K top ( ) ( ) Chromosphere is seen briefly during a solar eclipse as a red rim around the sun. Spicules Jets of relatively cool gas leaving the chromosphere and...
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This note was uploaded on 04/15/2008 for the course AST 0035 taught by Professor Barbkucinski during the Fall '08 term at Pittsburgh.

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The SUN - The Sun Phenomena of the Surface & Outer...

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