Effects of solar flares arriving on Earth

WASHINGTON (AP) ? Federal forecasters say the effects from a series of eruptions on the sun are arriving on Earth and could affect some communications for a day or so.

Operators of electrical grids are working to avoid outages, but the National Oceanic and Atmospheric Administration says some satellite communications and Global Positioning Systems could face problems.

Three solar flares erupted on the sun starting Tuesday, and the strongest electromagnetic shocks were being felt Friday by the ACE spacecraft, a satellite that measures radiation bursts a few minutes before they strike Earth.

A 1989 solar flare knocked out the electrical systems in Quebec, but the current solar storm is not expected to be that powerful.