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Title:

The Sun

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Nuclear power and the sun's radiation. The layers of the sun; core, radiative zone, convective zone, photosphere, ... The Sun Nuclear Power'ed ... – PowerPoint PPT presentation

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Title: The Sun


1
The Sun A typical Star
  • Heres the Story well Unfold for you
  • Nuclear power and the suns radiation
  • The layers of the sun core, radiative zone,
    convective zone, photosphere, chromosphere, and
    corona
  • Sunspots and magnetic fields, the sunspot cycle
  • Solar activity and how it influences the Earth

2
Gravity vs. pressure
3
A Star A Balance between Gravity and Pressure
  • Self-regulating
  • Higher fusion rate would expand star, lowering
    cores self-gravity and thence density,
    pressure, temperature and thus lowering fusion
    rate. And vice versa

4
Solar spectrum (from eschelle spectrograph)
5
The Sun Nuclear Powered
  • Core Tgt10M Kelvin, high speed protons moving so
    fast they approach to within 10-13 cm, leading to
    hydrogen fusion into helium
  • Fusion the Strong Nuclear Force overcomes EM
    repulsion of protons
  • 4H ? He 2 gamma rays 2 neutrinos
  • Gamma rays random-walk their way to the surface
    takes 50,000 years! distributing their energy
    along the way, wavelength lengthening to
    eventually become visible light at the surface

6
Fusion Temp strong vs em
7
Layers of the sun
8
Sun layers
9
granulation
10
granules
11
Sun globe in Halpha
12
Chromosphere all around
13
chromosphere
14
Eclipse chromosphere
15
Diamond ring
16
Total eclipse corona
17
Eclipse composite
18
Sunspots optical
19
Sunspot group optical
20
Sunspots
  • Zeeman Effect splitting of spectral lines into
    triplets, due to the gas being imbedded within a
    magnetic field
  • Think of magnetic field lines like sticky rubber
    bands
  • Charged particles in a magnetic field feel a
    force sideways to their motion, binding the gas
    to the field.
  • Sunspots are like magnetic scabs of gas unable
    to be recirculated to lower, hotter levels. They
    are bound to the magnetic fields in the
    photosphere, cooling as they radiate to the cold
    universe, and hence cool and darken.
  • Vertical structure of a sunspot

21
Babcock slide
22
Differential Rotation intensified and
concentrates magnetic field energy, producing
sunspots
23
Marching sunspots
24
Sun pic at max,min
25
Sunspot cycle vs time
26
Sunspot cycle 1760-1965
27
(No Transcript)
28
Ha loop
29
Xray loops
30
Xrays- chromospheric mag field loops
31
Magnetic field spaghetti!
32
Powerful solar flare
33
Xray sun
34
Total eclipse corona
35
Eclipse corona2
36
solarwind
37
Earth magnetosphere
38
EarthOnionMagField
39
Aurorae GiNormous Flourescent Lights!
  • Caused when high speed solar wind particles
    impact the Earths atmosphere
  • Collisionally excites the nitrogen and oxygen
    atoms
  • These atoms then de-excite (electrons fall back
    down through the energy levels) giving off
    photons
  • Exactly the same as how flourescent lights work!

40
greenpurpleAurora
41
Aurora barn
42
Aurorachu Alaska
43
Aurora westlake
44
Aurora lindersen
45
Aurora hoffman
46
Aurora c/IkeyaZhang
47
Aurora ewoldt
48
Aurora people
49
Aurora tricolor
50
Aurora tower
51
Aurora from space iss
52
Jupiter aurora
53
Saturn aurorae
54
cme
55
Comet NEAT kinky tail
56
SOHO wide angle
57
SOHOCMDNEAT
58
Sun Halpha big prominence
59
Sun halpha big prom later
60
heliopause
61
The Genesis Mission
  • (no, not the hokey StarTrek thing)
  • Spacecraft spent months out in interplanetary
    space, capturing particles from the solar wind
    and from interstellar space
  • Then, brought them back to earth
  • But, there was this parachute problem

62
Genisis spacecraft crash site
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