Huge íHoleí In Sun Spied By NASA/ESA Spacecraft
2013 07 30

From: HuffingtonPost

Coronal Hole Seen Over Sunís North Pole By SOHO Spacecraft

A space telescope aimed at the sun has spotted a gigantic hole in the solar atmosphere ó a dark spot that covers nearly a quarter of our closest star, spewing solar material and gas into space.

The so-called coronal hole over the sunís north pole came into view between July 13 and 18 and was observed by the Solar and Heliospheric Observatory, or SOHO. NASA released a video of the sun hole as seen by the SOHO spacecraft, showing the region as a vast dark spot surrounded by solar activity.

Coronal holes are darker, cooler regions of the sunís atmosphere, or corona, containing little solar material. In these gaps, magnetic field lines whip out into the solar wind rather than looping back to the sunís surface. Coronal holes can affect space weather, as they send solar particles streaming off the sun about three times faster than the slower wind unleashed elsewhere from the sunís atmosphere, according to a description from NASA.

"While itís unclear what causes coronal holes, they correlate to areas on the sun where magnetic fields soar up and away, failing to loop back down to the surface, as they do elsewhere," NASAís Karen Fox at the agencyís Goddard Space Flight Center in Greenbelt, Md., explained in an image description.

These holes are not uncommon, but their frequency changes with the solar activity cycle. The sun is currently reaching its 11-year peak in activity, known as the solar maximum. Around the time of this peak, the sunís poles switch their magnetism. The number of coronal holes typically decreases leading up to the switch.

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Read the full article at: huffingtonpost.com







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