3 Since you read the chapter Since you read the chapterWe won’t be spending time on these vocab words that were part of your reading guide.
4 Review of VocabularyCore - central region, where nuclear fusion occurs.
5 How does the sun produce energy? Energy is produced in its central region by the fusion of hydrogen nuclei into helium nuclei.What new isotope is produced by this fusion reaction? Helium
6 Question: What new isotope is produced by this fusion reaction? hydrogen-1helium-4oxygen-16none
7 What new isotope is produced by this fusion reaction? hydrogen-1helium-4oxygen-16none
8 May the force be with you! 26.1 Forces in BalanceMay the force be with you!
9 Why does the sun remain stable over time? Inward pull of gravity balances the outward push of thermal pressure from nuclear fusion.Sun will remain stable for another 5 billion years.
10 Question: What would happen to the sun if it began to run out of fuel? It would become cooler very quickly.The force of gravity would decrease.Its core would expand as thermal pressure increased.Its core would shrink as thermal pressure decreased.
11 What would happen to the sun if it began to run out of fuel? It would become cooler very quickly.The force of gravity would decrease.Its core would expand as thermal pressure increased.Its core would shrink as thermal pressure decreased.
12 Sunny’s pretty on the inside? 26.1 The Sun’s InteriorSunny’s pretty on the inside?
13 Interior facts The sun’s interior consists of 3 parts. CoreRadiation zoneConvection zoneEnergy moves through the sun in two main ways:RadiationConvection
14 Review of VocabularyRadiation zone - region of highly compressed gas where energy is transferred by the radiation.
15 Review of VocabularyConvection zone - the outer layer of the sun's interior, where energy is transferred mainly by convection currents.
18 Exterior facts The sun's atmosphere consists of three layers. PhotosphereChromosphereCoronaThese regions are outside the convection zone.
19 Photosphere Innermost layer Visible surface of the sun 500 kilometers thickTemp: approximately 5800 K
20 Chromosphere Middle layer Temp: increases to nearly 10,000 K At high temperatures, hydrogen gas emits a reddish light.This light gives it its name, which means “sphere of color.”Can see this during a total solar eclipse.
21 Corona Outermost layer Gases in the corona are thin Temp: Gases super hot (about 1 million K)Thermal energy in it is relatively small.Usually seen only during solar eclipses.
23 26.1 Features of the Sun’s Atmosphere You will use your notes and text to compare and contrast these features after lecture with table partner.
24 Sunny’s got a magnetic personality! The sun's magnetic field produces striking features on and above its surfaceSuch as:SunspotsProminencesSolar flares.
25 SunspotsAreas of gas in the photosphere that are cooler than the surrounding gases.Spots can be larger than EarthAssociated with intense magnetic fields on the sun.Last from a few hours to a few months.Numbers varies in cycles, with about 11 years separating one sunspot peak from the next.During peak periods, there may be a hundred sunspots on the sun.
27 Prominences Huge loops of gas that erupt from sunspot regions. Extend from the photo S into the chromo S and sometimes into the corona.Travel along the magnetic field lines that connect sunspots.Heights can be more than 100,000 kilometers above the sun's surface.
30 Solar Flares Sudden release of energy Surface erupts dramatically, producing X-rays and hurling charged particles into space.Heat the corona to a temps near 20 million K and produce solar wind.High-energy particles and radiation can reach EarthCause magnetic storms in Earth's upper atmosphere.Storms disrupt electric power transmission, radio, TV, and phone signals.Like prominences, solar flares usually occur near sunspots.
33 Question: How can sunspots be recognized on the sun's surface? Sunspots appear darker than the surrounding photosphere.Sunspots appear lighter than the surrounding photosphere.It is hard to distinguish sunspots from the surrounding photosphere.Sunspots always appear in definite groups.
34 How can sunspots be recognized on the sun's surface? Sunspots appear darker than the surrounding photosphere.Sunspots appear lighter than the surrounding photosphere.It is hard to distinguish sunspots from the surrounding photosphere.Sunspots always appear in definite groups.
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