邻近地理极的区域,没有公认的明确区界。
极区电子沉降对电离层影响的模拟研究_stmopen 关键词】: 极区,电离层,电子沉降,数值模拟 [gap=1226]Keywords】: Polar region,Ionosphere,Electron precipitation,Numerical simulation
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NASA的月球勘测轨道飞行器历时六个月，拍摄了1,700张月球极区的照片。
Over six months, NASA's Lunar Reconnaissance Orbiter took 1,700 pictures of the moon's polar region.
juno所携带的彩色照相机将会提供木星的近距离图片，包括第一次拍摄木星极区得图片。
Juno's color camera will provide close-up images of Jupiter, including the first detailed glimpse of the planet's poles.
他会警告负责极区的部长，如果再不下措施抑制温室气体的排放，则北极的冰帽将在五年内完全消失。
He is expected to warn ministers in polar regions that the arctic ice cap may totally disappear in as little as five years if nothing is done to curb greenhouse emissions.
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