Lecture 5

Lecture 5 - The Visible Sun Thursday, February 04, 2010...

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The Visible Sun Thursday, February 04, 2010 1:46 PM 1. The sun really has a "fuzz" around it about 400km thick, but considering our distance and the size of the sun that’s really only a small fraction of it, so we see it as sharp-edged. 1. Edge of the sun is called the "limb" a. Limb darkening - why the edge is darker a. You can see down through the outer cooler layers a. What you see depends on what angle you look at it (why the center is a lot brighter in the center and redder on the edges, because you are seeing more of the cooler "limb" on the edges) 1. Absorption lines a. Hot lower layers absorb a lot of the radiation a. "Fraunhofer" lines 1. Circulating convection currents produce granules (about 4 million of them) the size of Texas that rise to the top, cool of significantly and drop back down a. Each one lasts minutes/tens of minutes a. They are constantly in motion and constantly going away and being replaced 1. Corona of the sun is a really good vacuum a.
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This note was uploaded on 03/30/2012 for the course ASTR 1102 taught by Professor Staff during the Spring '08 term at LSU.

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Lecture 5 - The Visible Sun Thursday, February 04, 2010...

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