RESUMEN
The spectrum in the range of 400-600 nm from the first return stroke of an intense cloud-to-ground lightning flash was obtained by a slit-free spectrograph. Applying the atomic structure theory to the research work on lightning spectra, the wavelengths, oscillator strengths and excitation energies of upper levels were calculated for the transitions of related lightning spectrum. Multi-configuration Dirac-Fock method was employed in the calculation. From the results, re-identifications were carried out for the lines of 419.0 and 425.3 nm. It was found by spectral analysis combined with corresponding electrical information finds that the spectrum characteristic is closely related to the intensity of lightning discharge, as during an intense lightning return stroke the lines of O II with high excitation energies are enhanced.
RESUMEN
In the coastal area of Guangdong, slit-less spectra for first return strokes of lightning between the cloud and ground were obtained. After spectrum analysis and line identification were done by using multi-configuration Dirac-Fock (MCDF) method, parameters like wavelengths, oscillator strengths, transition probabilities, and excitation energies were calculated. According to the relative intensities of lines and transition parameters, temperatures for individual lightning strokes and at different heights of the discharge channel were calculated by using multiple-line method. The result shows that the temperatures in return stroke channel varied from stroke to stroke. In general, the more intensive the lightning discharge, the higher the value of channel temperature. On the other hand, for a certain return stroke channel, the temperatures at different positions show signs of falling away with increasing height along the discharge channel. Compared with that of Qinghai plateau, lightning in Guangdong coastal area is more intensive, and the lines from higher excitation potential of N II in these lightning spectra are easier observed.
