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House Science Committee Subcommittee on Environment, Technology and Standards Hearing Charter: What is Space Weather and Who Should Forecast It? | SpaceRef - Your Space Reference: "The first recorded evidence of space weather effects on technology was in 1859, when a major failure of telegraph systems in New England and Europe coincided with a large solar flare. More recently, on March 13, 1989, geomagnetically induced currents in Canadian transmission lines set off a cascade of broken circuits, causing loss of power for the entire Hydro-Quebec power grid. The blackout affected six million customers and cost Hydro-Quebec more than $10 million.

In 1998, a similar geomagnetic storm was headed for Earth. This time, thanks to data from new sensors and improved forecast models, NOAA's SEC forecasters were able to alert electric power customers 40 minutes before the storm hit the Earth. In response, electric power utilities diverted power and increased safety margins on certain parts of the grid to avoid stress on the power system."

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