Lecture 6

Lecture 6 - whole earth o Hunting for more evidence The sun...

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The Sun, Magnetic Fields, and the Corona Tuesday, February 09, 2010 1:44 PM 1. Hydrogen is the most plentiful gas in the solar system 2. Magnetic fields on the sun o Coronal loops are very jumbled and tangled whereas the magnetic fields on the earth are much more uniform o Coronograph: photo of the sun where you make an eclipse, block out the surface of the sun, to study it better 3. Is the sun responsible for global warming? o (versus humans being responsible for it)--- NO o Roughly an 11 year Solar cycle of maximum sun spots to minimum sun spots back to solar maxima o How does this affect global warming? Long term trends At one point (1650-1700) there was virtually no solar activity-- "Little Ice Age" (New York Harbor froze), this was when the sun spots went away Makes it seem like the sun affects the weather, but this only occurred in the northern hemisphere, if it was due to the sun, then it should have affected the
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Unformatted text preview: whole earth o Hunting for more evidence The sun is a lot more active now There's no evidence that recent global warming is caused by the sun 4. Which layer of the sun produces the sharp visible edge to the sun? o Chromosphere o Photosphere o Corona 5. Which is the coolest layer of the sun? o Core o Photosphere o Chromosphere------------------------------------------------end of unit 1 for the first exam-------------------------------------------------1. Why might a star appear dim, even if it's hot and big? o Dust o Evident when looking at the center of our galaxy o Some stars are very red because they are on the other side of a lot of dust 2. Measuring distance o One of the simplest measurements to get, but also the hardest to get o In the last 100 years we've determined that our galaxy is not the only one, there are bigger ones out there (Andromeda Galaxy)...
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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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