印尼惊现“血红天空” 气象专家：瑞利散射现象光华日报

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印尼林火肆虐，占碑省上周末竟出现血红色的天空，彷如世界末日的场面。气象专家说，不寻常的天空是由被称为瑞利散射的现象引起的。

占碑省21岁女子伊卡将周六大约中午时分拍摄的天空照片上传至脸书，获得超过3万4000人转发。整张照片一片血红色，许多人质疑是真的还是假的。她说：“是真的，我自己用手机拍的。”她表示雾霾特别厚，伤害了眼睛及喉咙。推特也有人上载了类似的照片，并写道：“这不是火星，这里是占碑。我们人类需要清洁的空气，而不是烟雾。”

印尼气象局表示，卫星图像显示数个热点，占碑省一带“浓烟密布”。新跃社科大学副教授许智扬解释，“血色天空”由被称为瑞利散射（Rayleigh scattering）的现象引起，与雾霾当中某些类型的颗粒有关。这是径比光或其他电磁辐射的波长小很多的微小颗粒对光束的散射。瑞利散射在光通过透明的固体及液体时都会发生，但以气体最为显著。

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