One of the most common atoptics are halos (sun and moon), iridescents clouds, rainbows and sun dogs.
With little human help you can even see gravity waves - really awesome phenomena and you should check it out on youtube or download the video (10 MB) where waves are clearly visible. And they are awesome.
You can also see gravity waves without rockets - on clouds, airglows, etc. Rarely.
Atmospheric Optics - Leading site for atmospheric optics. With explanations and pictures of every one.