NASAのインスタグラム(nasa) - 10月5日 01時02分

A dark snaking line in the upper right of this image on Sept. 30, 2014, show a filament of solar material hovering above the sun's surface. If straightened out, the filament would reach almost across the whole sun, about 1 million miles or 100 times the size of Earth.
Solar Dynamics Observatory, or SDO, which watches the sun 24 hours a day, has observed this gigantic filament for several days as it rotated around with the sun. If straightened out, the filament would reach almost across the whole sun, about 1 million miles or 100 times the size of Earth. SDO captured the image in extreme UV light of 193 Angstrom and 335 Angstrom – different colors represent different wavelengths of light and different temperatures of solar material.

Credit: NASA/SDO

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