《Table 1.Details of sprite observations on August 8, 2017.The sprite time gives the earlier time of

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《Triangulation of red sprites observed above a mesoscale convective system in North China》

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The coordinated observation system recorded 20 sprites，of which six were columnar sprites，eight were the dancing sprites and one was the jellyfish-shaped sprite（Soula et al.，2017；Yang J et al.2018），but there were no clearly visible halos in any of the observed images（Li JB et al.，2012）.Of these 20 sprites，eight lasted less than one field（<20 ms）and 12 lasted more than two fields（>40 ms）.The temporal resolution of each field is 20 ms，which is much longer than the 1–2 ms timescale associated with streamer initiation，so it is not possible to determine the propagating directions of the sprites.These events had an average top altitude o82.3 km and bottom altitude of 52.5 km.The electric field measurements indicate that all the sprites were induced by positive CGs.The sprites simultaneously captured at Xinzhou and Jiushan station were labeled as SP1 to SP6（Figure 6）and listed in Table 1The remaining 14 sprites were recorded at only one station.It should be noted that the sprite time in Column 2 of Table 1 is the time of the first field with sprite luminosity in the two videos，and that the time delay in Column 5 of Table 1 is the time difference between sprite time and first stroke time.