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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
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Earth to SOHO, Come in Please
26 June 1998 5:00 pm
Ground controllers have lost contact with SOHO, the premier sun-watching satellite. Controllers were putting SOHO--the Solar and Heliospheric Observatory--through routine maneuvers on Wednesday when a safeguard program kicked in unexpectedly. The program is meant to help the spacecraft find its bearings when it has lost its orientation toward the sun. "We are sending commands and streams of data, but so far the baby does not talk back to us," says Franco Bonacina, a spokesman for the European Space Agency (ESA) in Paris.
A joint project of NASA and ESA, SOHO was launched in December 1995 and has been monitoring the sun with 11 different instruments from a vantage point 1,500,000 kilometers sunwards from Earth. It has gathered data on everything from the sun's internal structure (Science, 26 June, p. 2047) to the outbursts of gas from the sun's atmosphere, called coronal mass ejections. The success of the craft persuaded planners to extend its operations--originally meant to end last spring--through 2003, to allow the spacecraft to observe the sun as its 11-year cycle of activity peaks.
"It potentially is a tremendous loss," says Cambridge University's Douglas Gough, co-investigator on three experiments studying solar oscillations, which hold clues to the sun's structure and motions. "Next we wanted to find out how the structure was going to change through the solar cycle," he says.
Such plans could fade quickly. One dire possibility is that the spacecraft is tumbling, which would cause the batteries to discharge since the solar panels no longer point toward the sun. That would dim hopes for reestablishing contact with SOHO, and without supervision, the satellite could slowly drift out of its stable orbit, says Bernhard Flick, ESA deputy project scientist for SOHO at the Goddard Space Flight Center in Greenbelt, Maryland. But Flick and others point out that contact with other wayward satellites has been reestablished before. "We haven't lost [SOHO] yet," says Gough. "I'm still optimistic."