午夜欧美大片免费观看,欧美激情综合五月色丁香,亚洲日本在线视频观看,午夜精品福利在线

It is always difficult to observe clouds at night with the naked eye when there is no light, starlight or moonlight. The routine cloud observation at night is to observe clouds in accordance with the observer’s vision in combination with the density of starlight, air clarity, cloud color and movement speed, weather phenomena and measured cloud height, as well as the observation of cloud condition at dusk. In order to identify the cloud condition at the located meteorological station rapidly and accurately at night, an introduction is made to the application of advanced apparatuses in assisting cloud observation, such as the data of atmospheric radiation, atmospheric electric field, meteorological satellite cloud pictures, and Doppler weather radar echoes, which can better cover the shortages in cloud observation during night time with the naked eye.