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. 2022 Mar 17;49(6):e2021GL095879. doi: 10.1029/2021GL095879

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© 2022. The Authors.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Blue corona discharge in a developing cell. (a) Photometer signals corresponding to the blue pulse and accompanying ultraviolet and red signals, on logarithmic scale and 5‐point Gaussian filtered. Concurrent Global Lightning Detection network (GLD) strokes (dots) displayed on top. t = 0 corresponds to 30 January 2019 17:02:48.525 Universal Time Coordinated. The time range of the photometer matches the exposure time of the respective camera frame (∼83.3 ms). (b) Photometer signals around the blue corona discharge, on linear scale and non‐filtered. (c) 337.0 nm and (d) 777.4 nm camera images projected on an altitude of 16 km. GLD strokes occurring within the integration time are displayed on top. The display images are the cropped and downloaded Modular Multispectral imaging array images with the observed activity.