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Learn about planets outside our solar system through Exoplanets and Alien Solar Systems by Tahir Yaqoob, Ph.D., a book in our online store book collection.
This image shows the dramatic difference between solar minimum and solar maximum. The picture on the left was taken in January 1996, near solar minimum. The picture on the right was taken in 1999 when the Sun was nearing solar maximum. The Sun certainly looks more active! These images were taken by the SOHO spacecraft.
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Courtesy of NASA/ESA

Ulysses Heads South for Solar Maximum
News story originally written on January 4, 2001

Many people head south for the winter. Well, the Ulysses space probe has headed to the south pole of the Sun! Bet, it's warmer there!

The Ulysses probe reached its maximum southern latitude of 80.1 degrees south on November 27, 2000. This is actually Ulysses's second trip around the southern side of the Sun. Its first trip was in 1994 when the Sun was at solar minimum. So, things could be quite different on this pass as the Sun is nearing solar maximum. "The Sun is the only star we can study at close quarters," says Richard Marsden, the European Space Agency's project scientist for Ulysses. "We need to get to know it in all its moods." And what a great opportunity this is for scientists to study the Sun over the whole of the 11-year solar cycle.

In fact, as the Sun reaches this point of increased activity, there is a fleet of spacecraft including ACE, Ulysses, SOHO, TRACE, Polar, Image, CLUSTER, WIND and Geotail making measurements. Combined with ground-based observatories, this will be the most watched solar maximum in history. There's no telling what scientists will learn about the Sun, space weather and its effects on Earth! "This is a unique solar maximum in history," said Dr. George Withbroe, Science Director for NASA's Sun-Earth Connection Program. "The images and data are beyond the wildest expectations of the astronomers of a generation ago."

Although Ulysses was launched in 1990, its mission is far from over. Ulysses will return to northern solar latitudes in October 2001.

Last modified February 1, 2001 by Jennifer Bergman.

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