MET4994_5994_S2011_homework2 - 2. Repeat the previous...

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MET 4994 Remote Sensing: Radar and Satellite Meteorology/MET5994 Remote Sensing in Meteorology Spring 2011 Homework #2 p. 1 of 1 Due Friday, Feb. 25, 2011 at 11:00 am (hand in or email to me before lecture starts). Goal The goal of this assignment is to understand solid angle, brightness temperature, Rayleigh-Jeans law, Snell s law, and Mie scattering theory Questions: 1. A satellite viewing a surface location under cloud-free conditions measures a radiance of 6.2 W m -2 μm -1 sr -1 at wavelength of 12 micron. (a ) Compute the brightness temperature T B . (b) Compute the actual temperature, assuming that the atmosphere is completely transparent, and that the surface s emissivity is 0.9 at this wavelength. (c) Is the ratio of the brightness temperature to the actual temperature equal to the emissivity?
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Unformatted text preview: 2. Repeat the previous question, but for a wavelength of 1 cm and a radiance of 2.103 x 10-10 W m-2 m-1 sr-1 . Answer (a), (b), and (c) in question 1. 3. Consider a cloud that, when view from a point on the surface, occupies the portion of the sky defined by /4 < < /2 and 0 < < /8 ( is the zenith angle, and is the azimuth angle). (a) What is the solid angle subtended by the cloud? (b) What percentage of the sky is covered by this cloud? 4. The S-band weather radar s wavelength is 10-cm. Assuming that the raindrops have approximately the same relative refractive index m as that used to produce the following figure (m=1.78), determine the range of raindrop radii that would fall in Rayleigh regime by using the exact Mie theory curve....
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This note was uploaded on 09/13/2011 for the course MET 4994 taught by Professor Haijan during the Spring '11 term at FIU.

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