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Welcome! Sun and Seasons Photo from http://sohowww.nascom.nasa.gov/bestofsoho/bestofsoho.html Created by the Lunar and Planetary Institute For Educational Use Only LPI is not responsible for the ways in which this powerpoint may be used or altered. What are we going to cover

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Slide1 l.jpg

Welcome!

Sun and Seasons

Photo from http://sohowww.nascom.nasa.gov/bestofsoho/bestofsoho.html

Created by the Lunar and Planetary Institute

For Educational Use Only

LPI is not responsible for the ways in which this powerpoint may be used or altered.


What are we going to cover l.jpg
What are we going to cover

  • Properties of the Sun

  • Influence on Earth:

    • Gravity

    • Light

    • Solar wind

  • Life cycle of the Sun

  • Seasons

Photo from http://sohowww.nascom.nasa.gov/bestofsoho/bestofsoho.html


The sun l.jpg
The Sun

  • Is a star

  • Made of gases

  • Is our primary source of energy

70% hydrogen and 28% helium

Light (radiation)

Image at http://science.nasa.gov/headlines/y2007/images/chromosphere/LimbFlareJan12_strip2.jpg


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How Big is the Sun?

Activity: Let’s measure the Sun


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How Big is the Sun?

About 110 times wider than Earth

Or

1.3 million times bigger than Earth

Photo from http://sohowww.nascom.nasa.gov/bestofsoho/bestofsoho.html


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How does our Sun compare to other Stars?

Our Sun is a dwarf—medium mass

  • Active stars range in size from supergiants to dwarfs

  • Stars range from very bright (supergiants) to very dim (dwarfs)

  • Stars range from very hot blue on the outside (O class) to cool red on the outside (M class)

Our Sun is a medium-bright dwarf

Our Sun is in-between--yellow


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So is our Sun an average star?

  • No—most stars are smaller and cooler than our Sun BUT

  • Most of the bright stars we see are bigger and hotter


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Rotation

High cadence solar rotation, EIT 195Š(Dec. 10-24, 1999) Movie at http://sohowww.nascom.nasa.gov/bestofsoho/Movies/EITdec99/EITdec99sm.mpg

At the equator, the Sun rotates once every 25.4 days

Near its poles, the Sun rotates once every 36 days

Known as “differential rotation”


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Sun’s Magnetic Field

  • Winds up due to differential rotation

  • Eventually forms loops and becomes tangled

Animation of how the Sun's magnetic field winds up and loops out.

Movie at http://sohowww.nascom.nasa.gov/bestofsoho/Movies/dynamo/dynamosm.mpg


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Inside the Sun

  • Core

  • Radiative Zone

  • Convection zone

Image at http://solarscience.msfc.nasa.gov/interior.shtml


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The Sun’s Atmosphere

  • Photosphere

  • Chromosphere

  • Corona

Photosphere image: http://science.msfc.nasa.gov/ssl/pad/solar/surface.htm

Chromosphere image: http://science.msfc.nasa.gov/ssl/pad/solar/chromos.htm

Corona image: http://solarsystem.nasa.gov/multimedia/display.cfm?IM_ID=191


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Energy from the Sun

  • Nuclear chain reaction (hydrogen forming helium)

  • Releases radiation (gamma rays)

  • The gamma ray loses energy as it bounces around inside the Sun

  • It is finally released at the photosphere, primarily as visible light

Image at http://solarscience.msfc.nasa.gov/interior.shtml


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Features in the Photosphere

  • Sunspots

    • Dark and small (but brighter than Full Moon and big as Earth)

    • Cool-- temperatures only 6,200 F (Sun’s surface is 10,000 F)

    • Associated with magnetic fields: one set of spots is positive, other is negative

Image at http://sohowww.nascom.nasa.gov/gallery/top10/top10_results.html


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More on Sunspots

  • Our Sun has an activity cycle of 11 years

  • Sunspots appear at specific latitudes on Sun

    • Bands of latitude move towards equator during cycle

Images at http://starchild.gsfc.nasa.gov/docs/StarChild/questions/question17.html andhttp://solarscience.msfc.nasa.gov/SunspotCycle.shtml


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Solar Events

  • Flares (Explosions of energy on the surface of the Sun)

  • Prominences

  • Coronal Mass Ejections (massive clouds of plasma ejected from the Sun)

Movie: Six months with EIT 171 (Aug. 12, 2003 - Feb. 9, 2004) http://sohowww.nascom.nasa.gov/bestofsoho/Movies/171/EIT171sm.mpg


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Solar Wind

  • Blows charged particles and magnetic fields away from the Sun

  • Charged particles captured by Earth’s magnetic field

  • Create Auroras or Northern and Southern Lights

Image at http://solarscience.msfc.nasa.gov/the_key.shtml


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Auroras

  • Electrons from solar wind are captured by the Earth’s magnetic field

  • Interact with atoms in our atmosphere: oxygen and nitrogen make red and green; nitrogen can also make violet

  • Northern lights are Aurora Borealis, while southern are Aurora Australis

Animation of solar wind impacting the magnetosphere and creating aurorahttp://sohowww.nascom.nasa.gov/bestofsoho/Movies/animation/Solarwind.mpg


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Coronal Mass Ejection

The eruption of a huge bubble of hot gas from the Sun

This series of images of coronal mass ejections taken with LASCO C3 (May 1-31, 1997) at http://sohowww.nascom.nasa.gov/bestofsoho/Movies/C3May97/C3May97sm.mpg


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CME’s effects on Earth

  • Can damage satellites

  • Very dangerous to astronauts

  • Power problems

Animation of a CME leaving the Sun, slamming into our magnetosphere.

http://sohowww.nascom.nasa.gov/bestofsoho/Movies/recon/reconsm.mpg


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Activities

  • Let’s go observe the Sun

  • Sunspot graphing


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Influences on Earth

  • Gravity

  • Light (Radiation)

  • Solar Wind (already discussed)


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Gravity

  • Orbits

    • The Sun’s powerful gravity keeps the planets in orbit


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Radiation

  • Our Sun (and all active stars) emits radiation

    • Radio, infrared, visible, ultraviolet, x-ray and even some gamma rays

    • Most of the sunlight is yellow-green visible light or close to it

The Sun at X-ray wavelengths

Image and info at http://imagine.gsfc.nasa.gov/docs/teachers/gammaraybursts/imagine/page18.html and

http://starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level2/sun.html

.


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Activities on Sunlight

  • UV Man (or woman, or dog, bug, etc.)

  • Observations of infrared light using filters and cell phones


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Sun’s Radiation at Earth

  • The Earth’s atmosphere filters out some frequencies

    • Ozone layer protects us from some ultra-violet, and most x-rays and gamma rays

    • Water and oxygen absorb some radio waves

    • Water vapor, carbon dioxide, and ozone absorbs some infrared

Electromagnetic spectrum

http://coolcosmos.ipac.caltech.edu/cosmic_classroom/ir_tutorial/what_is_ir.html

.


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Sunlight is absorbed by Earth

Let’s test what happens to the light.

Activity Time!!


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Sunlight is absorbed by Earth

  • The Sun does NOT send “heat rays” into space. Some of its light is infrared, but that is not the same thing as heat.

  • The Sun’s light is absorbed by Earth (clouds, plants, oceans, rock…)

  • By absorbing the light, we are transforming it into heat energy


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Sun as a Source of Energy

  • Light from the Sun is absorbed by the Earth, unevenly to:

    • drive wind bands – which drive surface currents

    • drive deep ocean currents

    • drive water cycle

    • drive weather

Credit: NASA GSFC Water and Energy Cycle

http://www.nasa.gov/centers/jpl/news/grace-20061212.html

NASA image at http://visibleearth.nasa.gov/view_rec.php?id=107


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Sun as a Source of Energy

  • Plants need light for photosynthesis

  • Without its heat, the only inhabitable areas on Earth would be near volcanic vents

Images from http://nasadaacs.eos.nasa.gov/articles/2005/2005_rainforest.html and http://planetquest.jpl.nasa.gov/TPF/tpf_book/gallery/4-2a.html


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Young stars form in nebulaefrom Small Magellanic Cloud

Image at http://hubblesite.org/newscenter/archive/releases/2007/04/image/a/results/50/


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Star-forming region in the Large Magellanic Cloud: http://hubblesite.org/newscenter/archive/releases/2008/31/image/a/results/50/


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Orion image at http://hubblesite.org/newscenter/archive/releases/2006/01/image/a/results/50/


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Our Sun is a Regular/ Small Star

Image at http://www.gsfc.nasa.gov/topstory/20011210insidesun.html


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In a few Billion years… Red Giant

Image at http://hubblesite.org/newscenter/archive/releases/1997/26/image/a/


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Our Sun’s Habitable Zone

Billions of years ago, things may have been different

  • The Sun was cooler (by up to 30%!)

  • Earth’s atmosphere was different (thicker, carbon dioxide)

  • Conditions will be different in the future

    • By many accounts, increases in the Sun’s temperature will make Earth uninhabitable in 1 billion years or less

    • These changes will also affect other planets… Mars?

  • Animation at http://www.nasa.gov/97994main_BHabitableZone.MPG


    By 5 billion years white dwarf l.jpg
    By 5 billion years… White Dwarf

    Image at http://hubblesite.org/newscenter/archive/releases/nebula/planetary/1998/39/results/50/


    Slide37 l.jpg

    Image at http://hubblesite.org/newscenter/archive/releases/nebula/planetary/2000/28/image/a/format/web_print/results/50/


    Slide38 l.jpg

    Image at http://hubblesite.org/newscenter/archive/releases/nebula/planetary/2004/27/image/a/format/large_web/results/50/


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    Massive Stars are different

    Image from http://hubblesite.org/newscenter/archive/releases/nebula/emission/1997/33/results/50/


    Betelgeuse l.jpg
    Betelgeuse

    Image from http://hubblesite.org/newscenter/archive/releases/star/massive%20star/1996/04/image/a/results/50/


    Supernova massive star explodes l.jpg
    Supernova—Massive Star Explodes

    Images at

    http://hubblesite.org/newscenter/archive/releases/star/supernova/2004/09/results/50/http://hubblesite.org/newscenter/archive/releases/nebula/supernova-remnant/2005/37/results/50/

    http://chandra.harvard.edu/photo/2009/casa/


    Done with the sun l.jpg
    Done with the Sun

    • Time for Seasons!


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