科學圖說

日全食中的日冕
(Corona During Total Solar Eclipse)

日冕位於太陽大氣的最外層，只有在日全食時，可以在不藉外物遮擋的狀況下，以肉眼觀測到。形狀隨太陽活動大小而變化，日冕分為內日冕和外日冕，外日冕最遠可達  2.3倍太陽半徑以上，超過幾百萬公里。 因為從內到外，光度差異甚大，可使用多種不同曝光值，捕捉不同高度與亮度的日冕，疊合成高動態範圍照片。
此作品以10種不同曝光值，疊合40張照片而成。曝光時間從1/200秒到2.5秒，每次增加一級曝光，共跑4次循環。對角線形狀的日冕，是一生難忘的壯麗景色。

The corona is the outermost part of the sun’s atmosphere and can be seen without special instruments during a total solar eclipse. It changes depending on the intensity of the sun’s activity. Divided into an internal corona and an external corona, the latter can reach a radius 2.3 times larger than that of the sun or several million kilometers. There is large variation in brightness from inside to outside. Different exposure values can capture coronas at different altitudes and of different brightness with superimposing of images. This work is the result of 10 different exposure values and 40 superimposed images. Exposure times were 1/200 sec to 2.5 sec. Each time, exposure was increased for a total of four cycles. This oblique corona was an unforgettable sight.