Originally posted by masta12d
To try to get this back on track....
The photo is amazing! I wish there was a way to filter the light like is done in this picture but then switch back to regular light to see this
triangle area in normal light.
I understand this is filtered but from the image it makes the sun look hollow which is really neat. Wouldn't it be something to find out both the
earth and sun was hollow? whoah 
You can do that.
The
SDO AIA array utilizes filters that
allow images to be taken of different wave lengths.
Specifically the SDO takes pictures in White Light, Ultra Violet and Extreme Ultra Violet wave lengths.
Those wave lengths are:
9.4 nm (nm = nanometers)
13.1 nm
17.1 nm
19.3 nm
21.1 nm
30.4 nm
33.5 nm
160 nm
170 nm
450 nm (this is the only visible frequency our eyes can see)
You can use this link here to the
Helio Viewer to see the latest images and even make flash movies from
them.
The Helio site allows you to access the AIA's images and the frequency bandwidth that you want, however, they list the numbers differently:
94
131
171
193
211
304
335
1600
1700
4500
Again, with 4500 being the only one that you can see with your eyes, if you say used a telescope with a solar filter, welder goggles, smoked glass,
etc, etc.
Here are the latest images from SDO, in the 21.1 nm, 30.4 nm, and 450 nm frequencies (the last being what our eyes see). Note how you can make the
faint outline of the coronal hole in the 30.4 nm one (you'll see it in some of the other frequencies too:
