The Magnetic Storm of Halloween 2003 October 15, 2013 Jeffrey J. Love, E. Joshua Rigler, and Jessica K. Robertson Read the following passage: The Halloween Storm In mid-October 2003, a bundle of concentrated magnetic energy emerged from the Sun's interior, forming a large sunspot, a site of seething activity. Enormous solar flares soon followed. Then, on October 28, the sunspot abruptly ejected a concentrated mass of electrically conducting solar wind, flinging it out into interplanetary space toward the Earth. Less than a day later, on October 29, a geomagnetic storm was initiated as the solar wind disrupted the Earth's protective magnetosphere. Over the next three days, the Halloween magnetic storm would evolve and grow to become one of the largest such storms in half a century. Magnetic storms are global phenomena, and their effects can be easily seen around the world. During the Halloween storm, for example, magnetic direction in Alaska quickly changed by more than 20 degrees. In other words, the storm was so large that it could be measured with a simple compass. The Halloween magnetic storm also produced spectacular aurora, with green phantom "northern lights" seen as far south as Texas and Florida. Source: http://www. usgs. gov/blogs/features/usgs_top_story/t he-magnetic-storm-of-halloween-2003 -2/ Which sentence from the section "The Halloween Storm" best summarizes its main idea? During the Halloween storm, for example, magnetic direction in Alaska quickly changed by more than 20 degrees. In mid-October 2003, a bundle of concentrated magnetic energy emerged from the Sun's interior, forming a large sunspot, a site of seething activity. Magnetic storms are global phenomena, and their effects can be easily seen around the world. In other words, the storm was so large that it could be measured with a simple compass.