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Important observational manifestations of subvisible mesospheric dust are Polar Mesospheric Summer EchoesPMSE which are produced by scattering from electron irregularities produced by dust charging.It has been observed that the PMSE strength can be artificially modified by using a ground-based ionospheric heating facilityto perturb the electron irregularity source region that is believed to produce PMSE. Recently it has become evident thatsignificant diagnostic information may be available about the dust layer from the temporal behavior of the electronirregularities during the heating process which modifies the background electron temperature. Particularly interesting andimportant periods of the temporal behavior are during the turn-on and turn-off of the radiowave heating. Although a numberof past theoretical and experimental investigations have considered the turn-off period, the objective here is to considerfuther possibilities for diagnostic information available as well as the underlying physical processes. Approximateanalytical models are developed and compared to a more accurate full computational model as a reference. Then from thetemporal behavior of the electron irregularities during the turn-off of the radiowave heating,the analytical models are used to obtain possible diagnostic information for various charged dust and background plasma quantities

On initial enhancement of mesospheric dust associated plasma irregularities subsequent to radiowave heating