A rare double burst of magnetically charged solar storms will hit Earth Thursday night and Friday, raising concerns that GPS signals, radio communications and power transmissions could be disrupted, officials said on Thursday. Individually, the storms, known as coronal mass ejections, or CMEs, wouldn't warrant special warnings, but their unusual close timing and direct path toward Earth spurred the National Oceanic and Atmospheric Administration's Space Weather Prediction Center to issue an alert. The first CME, which burst from a magnetically disturbed region of the sun on Monday night, should reach Earth Thursday night, center director Thomas Berger told reporters on a conference call. The same patch of solar real estate produced a second, more powerful storm about 1:45 p.m.