ps05 - Astronomy 10, Fall 2008 Homework 5 - 40 points total...

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Astronomy 10, Fall 2008 Homework 5 - 40 points total Due in the boxes in the basement of Campbell Hall by 5pm Tuesday, October 14 . Be sure to include your name, SID, Section Number, and GSI name on your homework, and staple it together. 1. Why are Sunspots Dark? (6 points) The spectrum of light coming from the Sun, to a very good approximation, looks like that of a perfect blackbody at a temperature T = 5800 K. This light is emitted from the outer layer of the Sun known as the photosphere. (a) How much power (Watts) does each square meter of the photosphere emit? This is also called the flux emitted by the photosphere. Note that flux has units of W / m 2 . (2 points) Sunspots are regions of lower temperature that appear on the photosphere. If we point a telescope at a sunspot and take a spectrum, we find that the light emitted follows a perfect blackbody at a temperature T spot = 3500 K. (b) How much flux ( W / m 2 ) is emitted by a typical sunspot? (2 point) (c) Using your answers to parts (a) and (b), explain why sunspots appear dark. (2 points) 2. Prominent Prominences (10 points) In this question we will try to get a sense for the size of the lower-left solar prominence (the big loop with the arrows pointing to it) in the image below.
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(image from http://sohowww.nascom.nasa.gov/)
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ps05 - Astronomy 10, Fall 2008 Homework 5 - 40 points total...

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