GSU GEOG 1112 - Geo_9e_Lecture_Ch02 (30 pages)

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Geo_9e_Lecture_Ch02



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Geo_9e_Lecture_Ch02

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Pages:
30
School:
Georgia State University
Course:
Geog 1112 - Intro to Weather & Climate
Intro to Weather & Climate Documents

Unformatted text preview:

Chapter 2 Lecture Geosystems 9th Edition Solar Energy to Earth and the Seasons 2015 Pearson Education Inc Learning Objectives Distinguish between galaxies stars and planets Locate Earth in the Solar System and Galaxy Summarize the origin formation and development of Earth Reconstruct Earth s annual orbit about the Sun Describe the Sun s operation Explain the characteristics of the solar wind Explain the characteristics of the electromagnetic spectrum of radiant energy Illustrate the interception of solar energy and its uneven distribution at the top of the atmosphere Define solar altitude solar declination and daylength Describe the annual variability of solar altitude solar declination and daylength Earth s seasonality 2015 Pearson Education Inc Milky Way Galaxy 2015 Pearson Education Inc Dimensions and Distances In astronomy what is the unit we use for distance light year distance that light travels in one year light speed 300 00 km s 1 light year ly 9 5 trillion km Light year is an unit of distance 2015 Pearson Education Inc Our Solar System 2015 Pearson Education Inc Earth s Orbit Earth s orbit around the Sun is presently elliptical a closed oval path Plane of Earth s orbit about the Sun is called the plane of ecliptic Average distance from Earth to the Sun is 150 000 000 km Light reaches Earth from the Sun in about 8 minutes and 20 seconds Perihelion closest on January 3 147 255 000 km Aphelion farthest on July 4 152 083 000 km 2015 Pearson Education Inc What is Solar Energy Energy is the capacity of a physical system to do work The unit is Joule J Solar energy is radiant energy i e radiant light and heat from the Sun Solar energy is generated by the nuclear fusion reaction process in which pairs of hydrogen nuclei are joined form helium and emit a large amount of energy 2015 Pearson Education Inc Sunspots Sunspots are caused by magnetic storms on the sun They are more than 12 times Earth s diameter Their temperatures are less than the temperatures of their



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