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CSI 769-001/PHYS 590-001 Solar Atmosphere Fall 2004 PowerPoint Presentation

CSI 769-001/PHYS 590-001 Solar Atmosphere Fall 2004

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The Sun as a Star Fall 2004

A main sequence star

5 billion years old

5 more billion years to go

Temp. 5800 K

~ 6000 K

Diameter: 695,000 km

~ 700,000 km

A gas ball

The Sun and the Earth Fall 2004

Distance: 1 AU (Astronomical Unit, average distance)

1 AU = 150 million km = 1.5e8 km

1 AU = 200 Rs (Rs: solar radius)

Light Travel Time: 8 minutes

Solar Wind Travel Time: 100 hours or 4 days (at 400 km/s)

Model of Solar Atmosphere Fall 2004

(1) Photosphere (2) Chromosphere (3) Transition Region (4) Corona

The Discovery of Corona Fall 2004

- Solar Eclipse Observations
- since Babylonian report in 1063 BC (?)
- Coronal ray noticed by Kepler (1571-1630), but thought moon origin
- Coronal ray also thought to be Earth atmosphere origin or artifacts
- When it was recognized as solar origin, it posed as a great puzzle
- How to explain the extended structure?
- How to explain the green line at 5303 Å?
- Broad line width of Green line 0.9 Å (Lyot 1939)
- Green line was later identified as from Fe XIV, highly ionized ion.
- With line width and element mass, temperature can be derived

Solar Eclipse Fall 2004

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