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Billy Henry
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SOHO
[3, 2, 1, ignition, and liftoff of SOHO and the Atlas vehicle on an international mission of solar physics.] Generally speaking, staring at the Sun non-stop for decades is a bad idea. But a spacecraft launched 30 years ago this week has done just that. It’s told us about the Sun’s interior, its surface, and its extended outer atmosphere. That’s helped scientists develop better forecasts of space weather – interactions between Sun and Earth that can have a big effect on our technology. The craft is called SOHO – Solar and Heliospheric Observatory. It was launched into an orbit around a point in space where the gravity of Earth and the Sun are balanced. From there, its view of the Sun is never blocked. SOHO watches the Sun in many different ways. It keeps a close eye on the Sun’s magnetic field, which produces outbursts of energy and particles that can have an impact on Earth. That’s revealed shockwaves and “tornadoes” rippling across the Sun’s surface. It’s also revealed the source of the solar wind – a steady flow of charged particles that blows through the solar system. Some of SOHO’s observations block out the Sun itself, showing the space around the Sun. That’s allowed SOHO to discover more than 5,000 comets as they passed close to the Sun – many of which didn’t survive. SOHO’s mission is scheduled to end soon – closing this long-working eye on the Sun. Script by Damond Benningfield
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