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A picture of one of the original SOHO posters.
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SOHO Mission Page

Have you ever wondered why your favorite radio station doesn't always come in? Solar activity, such as solar wind, sometimes causes this and other problems.

Scientists are trying to find ways to understand and forecast solar events. The SOHO mission is one way we are working to find the the answers. The Solar and Heliospheric Observatory is a byproduct of the European Space Agency and NASA. Together they have created and monitored the spacecraft since 1995. Although the primary mission was completed in 1997, scientists are still using the satellite, especially during the upcoming solar maximum.

SOHO has 12 very important instruments. They each have a purpose, and together they let scientists study the internal area of the Sun, its outer atmosphere and the origin of the solar wind.

The spacecraft has been through a lot since its launch on December 2, 1995. Mission control at Goddard Space Flight Center in Maryland, lost contact with the spacecraft for six weeks. Beeps that were sent out once every second eventually regained contact with SOHO. It has a rather unique orbit, which allows the satellite to stay over a billion kilometers ahead of the Earth. This way, the planet never crosses in front of SOHO, allowing the satellite to monitor the Sun at all times.

Some highlights of the mission include the discovery of tornadoes on the Sun's surface and a recent trip to the far side of the Sun, where it could see solar activity days before it would reach Earth.

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA