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On a 2,600 foot tower could bands of solar collectors at the 1,000-foot level and increments above that reheat the rising air and improve the updraft?

They might get the effect in a very cost effective manner by simply darkening the concrete in bands to improve solar heat absorption at fixed altitudes.

In the morning those bands would get sunlight first to warm the top of the tower. Which theoretically could slow start the updraft before the main panel grid is even in the sun.