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"Our only solar storm warning satellite on its last legs" from MSNBC News:

Until the sun's free-flying and highly energetic outbursts, known as coronal mass ejections, hit the ACE spacecraft, forecasters don't know the orientation of their embedded magnetic fields. Depending on the polarity, or alignment, Earth's magnetic shield will either peel away, giving the highly charged particles more freedom to disturb electrically sensitive equipment and communications, or rebuff the particles, such as what happened during this week's outburst.

Stationed about 1 million miles from Earth, ACE provides early warning of what's headed toward Earth. NOAA says more than 22,000 utility operators, airlines, satellite owners, GPS users and others are signed up to receive space weather alerts and millions more get the information on NOAA's website. ...

Another satellite with space weather sensors was slated to be launched in 2003 by the ill-fated shuttle Columbia crew, but the spacecraft, known as Triana, was nixed by the Bush administration because of its backing by former vice president and Democratic presidential nominee Al Gore. (Informally, Triana was sometimes referred to as GoreSat.) ...

"There were no technical reasons why it couldn't go. We were getting ready to send it the Cape (Kennedy Space Center) for launch and we got an order that the mission was not going to go," project scientist Adam Szabo, with NASA's Heliospheric Physics Laboratory at the Goddard Space Flight Center in Maryland, told Discovery News. ...

Launch is targeted for June 2014. The sun's 11-year solar cycle is expected to peak in May 2013. Heightened solar activity, which is ramping up this year, will continue for about the next six years.