Tuesday, June 21, 2011

Summer Solstice

The sun unleashed a powerful solar flare and eruption Tuesday just in time for the summer solstice: the first day of the summer in Earth's Northern Hemisphere.







The solar storm occurred in the early hours of Tuesday and was spotted by the space-based Solar and Heliospheric Observatory (SOHO) operated by NASA and the European Space Agency, according to the website Spaceweather.com, which monitors space weather and skywatching events.






Spaceweather.com officials said a moderate C7-class solar flare kicked off the solar storm and triggered a massive eruption of plasma, known as a coronal mass ejection.






"Magnetic fields above sunspot complex 1236 erupted during the early hours of June 21st, hurling a coronal mass ejection (CME) almost directly toward Earth," Spaceweather.com stated in an alert. "The incoming CME does not appear to be particularly potent; nevertheless, the cloud could trigger polar geomagnetic storms when it reaches Earth on or about June 23rd."






In one SOHO image from about 12:12 a.m. EDT, the eruption can be see streaming out from the sun near the top of the frame, appearing like a bright crown over the star. The event coincided with the summer solstice on Earth — a time when the sun is at its most northern point in the sky — which mark's the start of summer in the Northern Hemisphere, as well as the first day of winter in the Southern Hemisphere.






Class C7 solar flares are the least powerful type of flares. The more-powerful M-class solar flares are classified as medium-strength events, with intense X-Class flares topping the solar storm list.






Coronal mass ejections are massive eruptions of charged particles and solar material from the sun's surface. Some of these particles are blown out into space, while others can rain back down onto the sun's surface.




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