These aren't film frames from The Empire Strikes Back, even while they look exactly like Rebel Alliance's Echo Base, ion cannon included. They are not on the icy surface of planet Hoth, but much nearer, in the Artic circle.
Photographer Christian Houge took these beautiful pictures of a science research base in the Artic circle. The ion cannon is really a radome, a weatherproof dome that protects a radar antenna.
And those dishes waiting for Imperial AT-AT walkers are not going to fire anything. They are probably just microwave communication towers.
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Or secret anti-matter ray cannons. It can go either way. [Christian Houge via DRB]