1. The Sun Our Nearest Star

2. The Solar Spectrum
Image Source:

3. X-ray Yohkoh Soft X-ray Telescope (SXT).
From an object ~ million Kelvin

4. Ultra-Violet Solar and Heliospheric Observatory (SOHO).
UV from highly charged
Iron ions
Brighter regions
~ 1 million Kelvin
Darker are somewhat
cooler

5. The Fraunhofer Spectrum
Sourcehttp://csep10.phys.utk.edu/astr162/lect/sun/spectrum.html

6. Limb Darkening
Source: NASA

7. Sunspots Source: NASA http://solarscience.msfc.nasa.gov/surface.shtml
Life ~ days- weeks
As large as 80,000 km
Strong Magnetic Fields
Usually in sets with
Opposite magnetic
Polarity
11 year cycle

8. Faculae Source: NASA http://solarscience.msfc.nasa.gov/surface.shtml
Hotter Regions
Few thousands of
kilometers

9. Granules Source: NASA http://solarscience.msfc.nasa.gov/surface.shtml
~ 1000 km
20 minutes

10. C0nvection Cells