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The external matter stress-tensor supporting charged Vaidya solution appearsto violate weak energy condition in certain region of the spacetime. Motivatedby this, a new interpretation of charged Vaidya solution was proposed by Ori[1] in which the energy condition continues to be satisfied. In thisconstruction, one glues an outgoing Vaidya solution to the original ingoingVaidya solution provided the surface where the external stress-tensor vanishesis spacelike. We revisit this study and extend it to higher-dimensions, to AdSsettings, and to higher-derivative f(R) theories. In asymptotically flat spacecontext, we explore in detail the case when the mass function m(v) isproportional to the charge function q(v). When the proportionality constant \nu= q(v)/m(v) lies in between zero and one, we show that the surface where theexternal stress-tensor vanishes is spacelike and lies in between the inner andouter apparent horizons.

Charged Vaidya Solution Satisfies Weak Energy Condition