our star, the sun and the nature of the stars chapter 18 & 19 sun energy source interior...
TRANSCRIPT
Our Star, the Sun and The Nature of the Stars
Chapter 18 & 19Sun•Energy source•Interior structure and helio-seismology•Surface features•Atmosphere of the sunNature of the stars•Distance – parallax•Motion of the stars – proper and radial motion •Spectral types•H-R diagram•Binary systems
By the way, how is your research going?
16-1 The source of the Sun’s heat and light
16-2 How scientists model the Sun’s internal structure
16-3 How the Sun’s vibrations reveal what lies beneath its glowing surface
16-4 How scientists are able to probe the Sun’s energy-generating core
16-5 Why the gaseous Sun appears to have a sharp outer edge
16-6 Why the upper regions of the solar atmosphere have an emission spectrum
16-7 The relationship between the Sun’s corona and the solar wind
Chapter 16By reading this chapter, you will learn
16-8 The nature of sunspots16-9 The connection between
sunspots and the Sun’s magnetic field
16-10 How magnetic reconnection can power immense solar eruptions
Energy source of the sunSteps to Fuse Hydrogen into HeliumStep 1: 2 protons or hydrogen nuclei, combine to form a 2H. also produces a neutrino (n ), a neutral, nearly massless particle, & positron (e+). This positron encounters an electron (e-), annihilates to produce gamma-ray photons ( ). Step 2: 2H combines with a third proton, forming an isotope of helium (3He) and releasing another gamma-ray photon. Step 3: 2-3He nuclei formed 4He and releasing two protons. The gamma-ray & KE, are the source of the Sun's energy.
H fusionPP chain
Neutrino detection?
Interior structure
How are you doing?• The sun is the largest object in the solar
system: the sun’s diameter is about __ than Earth.
a) In order of million times larger, b) 1300 times larger, c) 100 times larger, d) 10 times larger
• The sun generates energy at:a) The surface ( photosphere), b) anywhere in the
sun, c) only at the core which takes up about 50% in radius, d) none of the above
• Sun’s energy source isa) Hydrogen fission, b) hydrogen fusion, c) helium
fission, d) helium fusion, e) uranium fissionClick “enter” to review your answers C, d,b
Watch the Solar blast video• http://video.nationalgeographic.com/video/
player/science/space-sci/solar-system/solar-blast-sci.html
• Is the sun a peaceful ball of gas?
• How hot is the core of the sun?
• What are / what causes the sun spots?
• What is a solar blast? Effect on earth?
Photosphere
Photosphere
Zeeman effect
Differential rotation and
magnetic field line
Go to the SOHO link. Is there any significant sun spot today?
• http://sohowww.nascom.nasa.gov/sunspots/
Temperature graph (2)Coronal mass ->solar windChromosphere
1. The convective current on the sun creates: a) granulations, b)Sunspots, c) solar wind, d) tide on Earth
2. Who was the first person to observe the sunspots? a) Hubble, b) Aristotle, c) Hipparchus, d) Galileo
3. What are sunspots? a) Permanent marking on the sun’s surface. b) higher temperature than surroundings, c) lower temperature than surrounding. d) made of different material than surrounding. (like storms on Jupiter)
4. Zeeman effect measures:a) temperature, b) mass, c) electric field, d) magnetic
field
Click “enter” to review your answers A,d, c, d