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lecture notes7

# What was the difference in insolation between the two

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Unformatted text preview: from Lab #3, Part I, as appropriate.) 6 Question Set #2. In this question you will compare solar radiation intensity at the top of the atmosphere on a surface directly facing the sun (that is, perpendicular to the sun's rays) on different days. You’ve been given two graphs showing insolation at the top of the atmosphere above Hanford, CA, one for the period from midnight to midnight on December 16, 1998 and the other from midnight to midnight on May 22, 1999. Each graph shows two plots. On each graph, refer in particular to the plot of one- hour average insolation on a surface directly facing the sun. Some pretty obvious things that you can tell from these two plots: • On a surface directly facing the sun, daytime insolation didn’t vary from hour to hour (except during the hours in which the sun rose and set, when the sun was below the horizon for part of each of the hour, thereby reducing the one- hour average insolation). • The number of hours of daylight differed on the two dates. There is another, more subtle difference, too: Question (2)(a). (For these questions, show your calculations. Don’t include the hours during which the sun rose and set.) • On a surface directly facing the sun, what was the difference in daytime insolation between these two days (in Watts/meter2)? • What was the daytime insolation averaged over the two days? • What was the difference in insolation between the two days expressed as a percentage of the two- day average insolation? 7 Suppose that the same curious person as before proposes a possible explanation for the difference in insolation that you identified in Question (2)(a), and those other two, equally curious people each propose an alternative explanation. Suppose that the three proposed explanations are: At the top of the atmosphere on a surface directly facing the sun, the difference in solar intensity between December 16, 1998 and May 22, 1999 was due to: 1. the difference in distance between the earth and the sun on the two days 2. the difference in sun angle between the tw...
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