Slide 1

Clear your desks and get ready for the final part of your unit test.

Slide 2

Go to bell-science.com Scroll over Earth/Environmental Science Scroll over Semester 1 Click Unit 1 Our Universe Scroll to the bottom of the page and open Unit 1 Pre- test analysis, complete the form using your pre-test Then open CosmologyTest Analysis, complete the form using your Cosmology Test Data Entry

Slide 3

You will be given 15 minutes to use your notes and correct any incorrect answers. For each correction you must also explain why that answer is correct (explain the science in your own words) You have until next Wednesday (9/24) You may come in during Homeroom Friday Before school any day After school Thurs, Fri, Mon, Tues Test Corrections

Slide 4

Our Sun

Slide 5

Universe Milky Way (spiral) Galaxy Solar System http://www.fromquarkstoquasars.com/galaxy-classifications-from-dwarfs-to-spirals-and-beyond/

Slide 6

http://upload.wikimedia.org/wikipedia/commons/0/0f/Earth%27s_Location_in_the_Universe_SMALLER_%28JPEG%29.jpg Where are we? http://nineplanets.org/

Slide 7

How did it form? Basic facts 99.8% of mass 100x diameter of Earth 5,527 o C 92.1% H, 7.8% He Plasma Sun today Sun today Main source of Earths energy Our Sun http://www.nasa.gov/images/content/524990main_FAQ10_full.jpg

Slide 8

Definitions Thermal energy Temperature Heat Types of heat Occur in different parts of the Sun Core Dense, hottest Hydrogen fusion Conduction How do we get the Suns energy?

Slide 9

Radiation Energy transfer (heat) Light waves Also how energy gets to Earth Energy moves slowly Thick layer Radiation Zone

Slide 10

Convection Zone Uses convection In liquids and gases Material heated (conduction) Rises.why? Sinks.why? Repeat Moves more quickly in this layer

Slide 11

1.VideoVideo Write down your observations Why did that happen? Daily Review #1

Slide 12

Photosphere Visible surface Chromosphere Red High speed gas Corona Hot Outermost layer Seen during an eclipse Outer Solar Structure

Slide 13

Sunspots Dark Cold Solar flares High energy Explosive Prominence Loops/arches Surface Feature Basics http://www.space.com/11506-space-weather-sunspots-solar-flares-coronal-mass-ejections.html http://spacefellowship.com/news/art21967/the-strange-case-of-solar-flares-and-radioactive-elements.html http://oneminuteastronomer.com/1018/sunspots/

Slide 14

What is a magnetic field? What causes a magnetic field? On the Sun? Effect of rotation Different rotation rates Magnetic field lines get wound up Eventually snap Causes a solar flare Solar prominences Follow magnetic field lines into space Suns Magnetic Field http://www.cbsnews.com/8301-205_162-57597396/

Slide 15

Cooler than nearby areas Appear in pairs Intense magnetic field Lines go out and in Sunspots

Slide 16

Hot, high speed, plasma streams Corona expanding Coronal Mass Ejections (CME) Massive eruption Rearrangement of magnetic field lines One hit on 10/15/13 Effects on Earth Disrupt magnetic field shape Danger to astronauts Damage electronics Aurora Solar Wind http://stereo.gsfc.nasa.gov/browse/2013/10/14/index.shtml

Slide 17

Predictable cycle 11-years Minimums Last = 2008 Low # of prominences, flares and sunspots Cooler climate on Earth Next maximum = 2013 Sunspot Cycle

Slide 18

Borealis or Australis Interaction of particles and magnetic field Particles drawn to poles Colors Elements Altitude Constantly changing Video Video Aurora http://www.public.iastate.edu/~sdk/fick2003/october.html http://news.nationalgeographic.com/news/2011/09/pictures/110930-northern-lights-aurora-borealis-bright-colors/#/space163-aurora-borealis-from-space_41077_600x450.jpg