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Experimental results concerning the behaviour of leader filaments near the anode are obtained using schlieren techniques in the case of small and large air gaps. Two main phases are studied. The first one, associated with injection of current (active phase), exhibits a perturbation of thermal and electrical properties of the leader near the anode. The study of the second phase, corresponding to a zero current injection (relaxation phase), allows the measurement of the recovery time of air density inside the leader channel.
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Domens et al. (1991) studied this question.
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