Lecture 3-Earth-Sun Relationships

Lecture 3-Earth-Sun Relationships - Lecture 3-The Earth and...

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Lecture 3-The Earth and Sun
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The Earth-Sun Relationship Sun’s energy Allows life to exist Affects weather patterns See notes for how….
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Sun and its Energy Thermonuclear fusion powers the sun 2 hydrogen atoms fuse together to form 1 helium atom. Energy emitted from the sun is in the form of Electromagnetic energy calorie The Earth Sun System
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Earth’s Orbital Path Orbital path is an ellipse not a perfect circle This shape actually varies over vast time cycles (+100,000s to millions of years)
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Terms-Perihelion “close” + “sun” (peri + helion) =when earth is closest to sun ~January 3 (only ~91 million miles away)
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Terms-Aphelion “away” + “sun” (ap + helion) when earth is furthest from sun ~July 4 (it is ~95 million miles away)
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The Sun itself Our closest star averages~93 million miles away Same as traveling around the Earth’s equator 3,750 times!
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The Sun Largest object in solar system Sun by itself accounts for >99% of the Solar System’s mass!
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Solar Energy Solar energy comes from Fusion Hydrogen atoms forced together pairs of hydrogen nuclei are fused; and energy is released = Two principal outputs
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Sun constantly emitting electrically charged particles that move outward from surface solar prominence Large magnetic storms occur = sunspots
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Magnetosphere Magnetosphere is Earth’s outer defense against this solar wind =also known as the magnetic field surrounding Earth Generated mainly by Earth’s inner core-molten iron
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Byproduct-Auroras Solar wind also creates auroras Aurora borealis (Northern lights) Aurora australis (Southern lights)
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Thermopause -top of atmosphere Only a fraction of sun’s energy output reaches us, but is still a huge energy input into our systems 2. Radiant Energy -93 million miles later
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Lecture 3-Earth-Sun Relationships - Lecture 3-The Earth and...

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