The fogbow isn't a physical object, just light coming from a particular direction.
However the density of fog and the presence of foreground objects do have an effect on the way we perceive its size.
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Compared to the two walkers the fogbow appears huge because it seems to be at a similar distance.
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The whole arc viewed from almost the same position, the tree appears to give it some scale.
Near the middle, almost lost in the fog, is a pair of small bushes about 2 metres high.
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Taken from a position close to these bushes the arc doesn't seem so large.
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Another view from further back shows the tree apparently behind the arc and the gate now gives a different sense of scale.
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Canon EOS 20D 22nd December 2006 Composites of several images
Wiltshire, England