The Interior Structure of the Sun

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Presentation transcript:

The Interior Structure of the Sun

First hint: solar granulation as evidence of convection Convection=boiling Motion of hot fluid in A gravitational field demo

The scale of solar granulation

Movie of solar granulation http://solarscience.msfc.nasa.gov/images/SVST_granulation.mpg Existence of granulation/convection shows That the Sun is hotter inside than in the photosphere

Our knowledge of the solar interior

Stellar interior slides from textbook (17.1) Gravity tends to squeeze a star into ever-smaller object. What resists this tendency?

How can we know the structure of the Sun below the photosphere? Application of the laws of physics (equations of stellar structure), find solution consistent with mass and radius of Sun Measure “eigenmodes” of the Sun (see how fast it jiggles Results for how the sun is put together

Physical properties 1: density Units: mass/volume Grams/cc water…1 grams/cc rock… about 3 grams/cc Lead…11.3 grams/cc

Physical properties 2: temperature Units: degrees centrigrade Temperature Kelvin: degrees C about absolute zero Temperature of this room: 295K Boiling point of water: 373 K Surface temperature of Sun 5800K

Distribution of density inside the Sun

Distribution of temperature inside the Sun

The interior of the Sun is a region of extreme physical conditions

Next topic: what is the luminosity of the Sun telling us? Luminosity = 3.847X1026 Watts What fuel cycle could provide this? What fuel cycle could provide this for the lifetime of the Sun?

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