Don Pettit, veteran astronaut and anxious to go back up, has pioneered some remarkable imaging from the cupola on the ISS. His presentation at ALCON was wonderful.

Don mentioned to a few of us that he is wondering what would be the best narrow band filter to use on a little solar telescope aboard the ISS? He mentioned something around the 760nm (O2) line, which has significant extinction by our atmosphere, apparently.

But I don't think there really is any wavelength so attenuated in the visible spectrum that warrants an ISS scope. If so, though hopefully I am wrong since it would be cool to have a visual tool for the Sun, then perhaps a certain UV or other special filter would be more beneficial for science. The UV band varies perhaps 10 times as much as the rest of the solar spectrum.

Any suggestions I could pass on to Don, via a closer friend of his?