十大最美妙摄影:日食“珠子项链”(图)(8)
8、监控火山活动
2009年3月22日,美国阿拉斯加州雷道伯特火山喷发,火山向大气层喷射出大量的灰尘,使天空变得模糊不清。此后该火山又间歇性地喷发了4次。据阿拉斯加州火山观测台的科学家介绍,火山喷发的灰尘柱高达海拔5万英尺。
由于此次火山喷发出现在夜间,因此仅能通过热红外成像进行探测,如图所示,高温部分呈现出黑色,而低温部分则呈现白色。当灰尘柱上升至大气层一定高度时就会降温,呈现出图像中白色部分。3月23日,在雷道伯特火山即将进行第五次喷发时,美国宇航局“Aqua”卫星的中解析度成像分光辐射度计拍摄到这一情景。
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