A weather satellite is used to monitor weather systems and the climate of the earth. Weather satellites have two types orbits. They can either have near-polar orbit or geostationary orbit. The former has lower altitudes and covers the complete Earth. The latter, on the other hand, stays put in one spot, and is found in higher altitudes.
If only S1 is closed, due to the diode across S3 is pointing to the right, the current cannot be flowing to the left.
So nothing will happen, the bulb is not on.