Approximately 9 years of Ottawa fixed-antenna 48 MHz auroral radar records have been examined for cases of periodically varying radio aurora following ssc's and si's. The occurrence, period, and time delay of onset of long period pulsating radio aurora (DPEl, and FPEl,) are found to be related to the amplitude of the ssc which precedes it. These relationships do not always hold for DPEl, and FPEl following si's. A discussion of the possibility of an association between the radio aurora and hydro-magnetic waves generated by the ssc or si is presented.