The dark area below the equator of the sun is a coronal hole- areas in the corona that are less dense and cooler than the surrounding areas, the solar magnetic field opens into interplanetary space. The picture, shown in false color, was taken on September 19th in ultravioletlight by the EIT instrument on board the space-based SOHO observatory. Coronal holes, studied in ultarviolet and x-ray light, are the source of high-speed solar winds. The solar winds streaming from this coronal hole caused colorful auroras on our planet, as seen by spaceweather watchers and astronomers from high altitudes.
Friday, October 12, 2007
APOD 1.5
The dark area below the equator of the sun is a coronal hole- areas in the corona that are less dense and cooler than the surrounding areas, the solar magnetic field opens into interplanetary space. The picture, shown in false color, was taken on September 19th in ultravioletlight by the EIT instrument on board the space-based SOHO observatory. Coronal holes, studied in ultarviolet and x-ray light, are the source of high-speed solar winds. The solar winds streaming from this coronal hole caused colorful auroras on our planet, as seen by spaceweather watchers and astronomers from high altitudes.
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