The data of the article"Analysis of Physical Characteristics of Lightning Return Stroke Channels During Radial Expansion"

Each image simultaneously records the zero level spectrum and first level spectrum of lightning, with a resolution of 896 × 512 and a bit depth of 16 bits. This dataset is divided into the following five files, among which file 1 mainly contains three images of lightning A in the text: the frame before the counterattack ("a1). tif"), the first frame after the counterattack ("a2). tif"), the second frame after the counterattack ("a3). tif"), and the three images of lightning B: the frame before the counterattack ("b1). tif"), the first frame after the counterattack ("b2. tif"), and the second frame after the counterattack ("b3). tif"; File 2 mainly contains the spectral intensity data of lightning A and B at a certain height, as shown in Figure 2 of this article; File 3 mainly contains the visible diameter data of lightning A and B, as shown in Figure 3 of this article; File 4 mainly contains the data of the core temperature and electron density of the first frame channel of lightning A and B as a function of channel height, which is shown in Figure 4 of this article; File 5 contains the data on the core temperature and electron density of the second frame channel of lightning A and B as a function of channel height, as shown in Figure 5 of this article; File 6 contains data on the temperature and electron density of the corona sheath in the first frame of lightning A and B channels as a function of channel height, as shown in Figure 6 of this article; File 7 contains data on the temperature and electron density of the corona sheath in the second frame of lightning A and B channels as a function of channel height, as shown in Figure 7 of this article.