Solar Terrestrial Probes Program

NASA's Solar Terrestrial Probes Program develops focused missions to investigate the fundamental physics of the connected Sun-Earth system and the wider heliosphere. Its scientific scope extends from solar activity and the solar wind to planetary space environments and the interstellar medium. A continuing portfolio of complementary spacecraft measurements examines how energy and matter move through magnetized plasma, with missions such as Hinode and Magnetospheric Multiscale addressing different parts of that system. The program's measurements support broader understanding of the physical processes that produce space weather.