"OMG! HUGE PROMINENCE: One of the biggest prominences in years erupted from the sun's northwestern limb today. The massive plasma-filled structure rose up and burst during a ~2 hour period around 0900 UT. "
"The eruption hurled a bright coronal mass ejection (CME) into space: SOHO movie. The cloud is not heading toward Earth, at least not directly. A glancing blow from the outskirts of the CME is possible two to three days from now, but any impact is likely to be mild. The eruption was more photogenic than geoeffective."
http://www.spaceweather.com/archive.php?view=1&day=13&month=04&year=2010"A solar wind gust hit Earth's magnetic field on April 15th, sparking a G1-class (Kp=5) geomagnetic storm."
"They could become stronger in the nights ahead. A coronal mass ejection (movie) blasted into space by an erupting prominence on April 13th could deliver a glancing blow to Earth's magnetic field on or about April 17th. (Note: This supercedes earlier estimates of an April 15th arrival.) High-latitude sky watchers should remain alert for auroras."
http://www.spaceweather.com/archive.php?PHPSESSID=korspe7gfusf6d3hvrjeel0th4&month=04&day=15&year=2010&view=view