Feb4 - Gas in spot held in place by magnetic field This gas...

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OUR SUN BASIC PROPERTIES OF OUR SUN: AND HOW WE KNOW • DISTANCE TO SUN: 150,000,000 km = 1 AU [Venus transits…] • MASS OF SUN: 2x10 30 kg [Kepler’s Law; M=(4 ! /G)*(D 3 /P 2 )] • RADIUS OF SUN: 700,000 km = 109 R Earth [R=D ! ; ! =angular size of Sun=0.5°] • DENSITY OF SUN: 1.4 gm/cc [Density=Mass/Volume] • TEMPERATURE OF SUN: 5700°K [Wein’s Law; " max =0.5 " {green}] • LUMINOSITY OF SUN: 4x10 26 Watts [L=4 ! D 2 b and L=4 ! R 2 * # T 4 ] • COMPOSITION OF SUN: 74% H, 25% He [from spectra]
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PARTS OF OUR SUN CLOSE UP ON THE SURFACE
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PROMINENCES AND CORONA ROTATION OF OUR SUN CHRISTOF SCHEINER's SUNSPOTS DIFFERENTIAL ROTATION => GAS
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SUNSPOTS CAUSED BY MAGNETIC FIELDS
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Unformatted text preview: Gas in spot held in place by magnetic field This gas radiates energy and cools Gas in spot is relatively cool Hence (by L $ # T 4 ) is is relatively dark T surface =5700K T sunspot =3400K SUN IN MANY WAVELENGTHS RADIO X-RAY OPTICAL INFRARED ULTRAVIOLET H-alpha DON'T STARE AT THE SUN THE EYE COLLECTS AND FOCUSESLIGHT, JUST LIKE A MAGNIFYING LENS RETINA BURNS FROM THE SUN: PERMANENT DAMAGE WHITE SPOTS ARE TEMPORARY HOW TO LOOK SAFELY AT OUR SUN PINHOLE CAMERA SPECIAL-MADE SOLAR FILTERS & SCOPES WELDERs GLASS #14 or ALUMINIZED MYLAR PROJECTION: w/scopes & binos:...
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Feb4 - Gas in spot held in place by magnetic field This gas...

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