摘 要: | Since the 1970′s a steady 2—day wave has been detected in the mesosphere and lowthermosphere by many observations such as meteor radar,partial reflection driftradar,means of satellite radiance measurements and rocket measurements.It has beenrevealed that 2—day wave travels westwards with longitudinal wave number three and theinferred vertical wave length of the wave is in excess of 100km.If a global scale wave
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