The solar activity produces conditions that influence Earth's atmosphere, technological systems and human health. We call these conditions the space weather.
Space weather is also a program which includes basic research, applied research and users.
Observations from spacecraft SOHO have given us a new picture of the Sun but also a way to warn for space weather effects. Spacecraft ACE has given us a way to make real-time forecasts hours ahead. Heliospheric current sheet Studies with the MDI instrument onboard SOHO, have shown the solar interior to us. We know today where the solar magnetic field is located and produced. We see how it changes.