# Could the International Space Station be fitted with solar sails?

How much solar sail and vane surface area would be needed to replace the boosts needed to keep the ISS in orbit? Could this be done at a higher orbit minimizing atmospheric drag?

What is the closest to Earth you can expect lift from a solar sail?

• Try to calculate the necessary size. How much time of an orbit the sails would deliver a useful force to the right direction for lifting the orbit? Would the force of the solar sails be substantialy bigger than the increased drag caused by the sails? – Uwe Oct 14 '18 at 18:44
• @Uwe thanks. I believe that with certain angles in the sail shadows overlapping canceling radiation pressure a certain angles in relation to the sun and the right orbit that a modified solar sails can be made to always have orbital stability? A mast would be needed. – Muze Oct 14 '18 at 18:52

Ignoring the ISS, the question is simply whether light pressure on the sail can counteract the drag on the sail from atmosphere. Light pressure near Earth is about $$10 \mu Pa$$ (with optimum geometry and no eclipse). So the question is what is the drag force per square meter of sail. We know that the ISS experiences about 0.2N of drag, and its area is dominated by the solar panels at around $$2500 m^2$$ suggesting a drag pressure in the vicinity of $$80 \mu Pa$$ at that altitude. So any sail will add more drag than boost.