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The
sun produces different frequencies of light in different parts of
its atmosphere. By filtering the light to look at specific frequencies
we can therefore look at we can see different parts of the Sun's atmosphere.
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White light
The full spectrum of visible light. This shows the photosphere, and is the
image you see if you view the sun using a pinhole camera.
H-alpha
H-alpha images are taken through a filter centered on a particular
frequency of visible red light -- one of the spectral lines of Hydrogen.
This light forms in the chromosphere, above the visible photosphere but
below the corona.
Extreme Ultraviolet
This frequency of light is also formed in the chromosphere. The particular
frequency used here forms high in the chromosphere and in the lower regions
of the sun's corona.
X-ray
The X-rays we can see form in the outermost layer of the sun's atmosphere,
the solar corona.
Magnetogram
Certain frequencies of light are sensitive to the presence of magnetic fields.
If we take a picture of the sun using those frequencies we can calculate
the direction and intensity of the magnetic field near the solar surface.
In the image used here the colors red and blue are used to indicate magnetic
fields pointing toward and away from the solar surface.
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