lundi 2 novembre 2015

Alert geomagnetic storms

NOAA forecasters are predicting a 90 percent chance of geomagnetic storms today and tomorrow, when a fast-moving stream of solar wind is expected to hit Earth’s magnetic field. NOAA has issued a G3 (strong) geomagnetic storm watch for November 2 (UTC) and a G2 (moderate) geomagnetic storm watch for November 3 (UTC), as a recurrent high-speed stream from a coronal hole returns.

“This particular feature was associated with G3 conditions last rotation,” NOAA said. Solar wind speeds could exceed 800 km/s. Sky watchers in the US should be on the alert for auroral displays as far south as Oregon and Illinois. Sky watchers in the USA should be alert for Northern Lights as far south as 40° or 50° N latitude.

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