The existing ground-station ionosphere data mentioned has been used to detect missile launches: https://www.armscontrolwonk.com/archive/1216884/detecting-missil

The existing ground-station ionosphere data mentioned has been used to detect missile launches: https://www.armscontrolwonk.com/archive/1216884/detecting-missile-launches-with-ionospheric-disturbances/ https://www.armscontrolwonk.com/archive/1216884/detecting-mi... I imagine you could do the same thing with much better coverage using this distributed ionosphere monitoring method.