Space weather disrupts communications, threatens other technologies on Earth, says CU-Boulder prof

Space weather disrupts communications, threatens other technologies on Earth, says CU-Boulder prof

February 17, 2011

A powerful solar flare has ushered in the largest space weather storm in at least four years and has already disrupted some ground communications on Earth, said University of Colorado Boulder Professor Daniel Baker, an internationally known space weather expert.

Classified as a Class X flare, the Feb. 15 event also spewed billions of tons of charged particles toward Earth in what are called coronal mass ejections and ignited a geomagnetic storm in Earth's magnetic field, said Baker, director of CU-Boulder's Laboratory for Atmospheric and Space Physics. Such powerful ejections can cause a variety of socioeconomic and safety issues ranging from the disruption of airline navigation systems and power grids to the safety of airline crews and astronauts.

"The sun is coming back to life," said Baker, who chaired a 2008 National Research Council committee that produced a report titled "Severe Space Weather Events -- Understanding Societal and Economic Impacts." For the past several years the sun has been in its most quiescent state since early in the 20th century, said Baker.

From a scientific standpoint a class X event -- the most powerful kind of solar flare -- is exciting, said Baker, also a CU-Boulder professor in the astrophysical and planetary sciences department. "But as a society, we can't afford to let our guard down when operating spacecraft in the near-Earth environment."

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