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Since its launch on 20 May 2004, FORMOSAT-2 (FS2) is still the unique satellite to observe the transient luminous events (TLEs) from orbit. In nearly 9 years from 4 July 2004 to 31 May 2013, the number and distribution of TLEs observed are summarized. The instrument used for the observation of TLEs is called imager of sprites and upper atmospheric lightning (ISUAL). This is the first time the observation...
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