Luminosity characteristics of lightning M components
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A high-speed streak photograph of a natural cloud-to-ground lightning return stroke followed by two M components is analyzed. The amplitude and waveshape of one M component light pulse is esentially invariant with height between the cloud base (about 1 km) and ground, while the other M component has a relatively constant light waveshape and a light amplitude that varies somewhat with height. The two M component light pulses, exhibit a more or less symmetrical waveshape with a risetime and falltime of the order of many tens of microseconds. -from Authors
author list (cited authors)
Jordan, D. M., Idone, V. P., Orville, R. E., Rakov, V. A., & Uman, M. A.