The correlation between the lightning current and the luminosity

if being found

can be adopted to investigate the characteristics of the lightning current through the corresponding light signal. In this paper

channel-base current and corresponding channel-bottom luminosity were simultaneously measured from nine rocket-triggered lightning flashes

in which all successfully were triggered at International Center for Lightning Research and Testing in 2011 and 2013. Totally

there are 39 return strokes

whose geometrical means for the peak value

the charge transfer

the 10%～90% risetime

and the half-peak width are

respectively

13.02 kA（ranging from 5.45 kA to 38.09 kA）

1.14 C（ranging from 0.28 C to 6.36 C）

0.35 μs（ranging from 0.16 μs to 1.19 μs）

and 25.51 μs（ranging from 5.62 μs to 61.44 μs）. The correlations of characteristic parameters between current and corresponding luminosity of return strokes are further analyzed. Linear correlations have been found not only between the current peak squared and the luminosity peak

but also between the current charge transfer and the luminosity-time integration. There is a tendency that the luminosity 10%～90% risetime increases with the increase of the current 10%～90% risetime. However

no direct correlations are found between their half-peak widths. Combined with the relations between current peak and luminosity peak

the current waveform reconstruction and charge transfer prediction are performed via the luminosity data. For the nine flashes

the discrepancy between the estimated charge transfers and their ground-truth counterparts ranges from-45.33% to +42.93%

with an averaged and a minimum absolute value being 31.44% and 2.75%

respectively.