20 Apr '11, 3am

NASAの画像:ちょうど1年前の4月に公開された写真。Solar Dynamics Observatoryという新しいミッションからの太陽の写真。左下の白丸は地球のサイズでとっても小さい!

NASAの画像:ちょうど1年前の4月に公開された写真。Solar Dynamics Observatoryという新しいミッションからの太陽の写真。左下の白丸は地球のサイズでとっても小さい!

On April 21, 2010, NASA released the first-light images from its newest sun-monitoring mission, the Solar Dynamics Observatory. The mission’s high-speed, IMAX-quality photography will improve predictions of solar activity that can disrupt everything from GPS satellites to high-voltage power lines. This image was captured by the new observatory’s Atmospheric Imaging Assembly on March 30, 2010. The sensor views the lower atmosphere of the Sun in ultraviolet wavelengths, and it captured this view as a massive plume of dense, cool (only compared to the rest of the solar atmosphere) plasma erupted on the Sun’s surface. The plasma flows in a loop along a magnetic field line. When these ribbons of plasma appear against the black backdrop of space, as in this image, they appear bright, and they are called solar prominences. Compared to the size and mass of the Sun, the prominence ...

Full article: http://earthobservatory.nasa.gov/IOTD/view.php?id=43717

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