Solar-Terrestrial Energy Programme

OBS: The Solar-Terrestrial Energy Program (STEP) ran from 1990-1997, and was a precursor of the current Space Weather program in the United States and other countries. It was an integrated effort to study activity on the Sun, propagation of energy bursts from the Sun to near-Earth space, energy coupling into the magnetosphere, and its redistribution and deposition in the upper and middle atmosphere. Satellites in orbit, astronauts in space, and Earth's surface technology are affected by such events.