A massive solar eruption, more than 30 times the length of Earth's diameter, blasted away from the Sun on Monday at 9:19 a.m. EDT. The ESA/NASA SOHO satellite captured this image of the spectacular eruptive prominence escaping the Sun.
Prominences are loops of magnetic fields with hot gas trapped inside. Sometimes, as the fields become unstable, the they will erupt and rise off of the Sun in just a few minutes or hours. If eruptions like these are directed toward the Earth they can cause a significant amount of aurora and other geomagnetic activity. - -From Cosmiverse.
July 2, 2002
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