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Good Reference Articles

 * Dutch Fork High School
 * Riverside High School (Wyoming)
 * Captain John L. Chapin High School
 * Academic Magnet High School

Facts for Wikipedia Assignment

 * Dark spots are visible when x-rays are taken of the sun.
 * Coronal holes extend from pole to pole or from equator to pole.
 * Occur when the Sun's magnetic field is open to interplanetary space.
 * During high solar activity, geomagnetic storms are caused by CMEs or coronal mass ejections.
 * During low solar activity, most geomagnetic storms are the result of coronal holes.
 * NASA's SDO has an image of a coronal hole that covers most of the upper left quadrant of the sun.
 * The speed of solar wind coming from solar hole is 400-500 miles per second, or twice the speed of naturally occurring solar wind.
 * Skylab first saw coronal holes in the early 1970s.
 * The open structure of the magnetic field allows high-density plasma to stream out of the holes.