TheassociationbetweenthelunarphasesandtheatmosphericelectricfieldhasbeeninvestigatedfromthesuperposedepochanalysisofthelongseriesofcontinuousdataoftheverticalelectricfieldforColaba,Bombay(18°53’N,73°48’E11mASL)fortheperiod1947-1966.Alsotheperiodicitiesintheatmosphericelectricfieldhavebeenstudiedfromthespectralanalysisofthedata.Thestudyhasindicatedthatwhenthefullmooniswithin4oftheeclipticplanei.e.,Bf4°,theelectricfieldpeaksonthedayofthefullmoonfollowedbyasteepfallinthefieldvaluesupto4daysfollowingthefullmoondayandthereafteritshowedasteepincrease.Also,theelectricfieldhasexhibited5-9dayperiodicityanditsmultiplesarenearlyalwayspresent.Theperiodicityintheelectricfieldcorrespondswiththeaveragetimeintervalbetweenthesuccessivemagneticsectorboundary(MSB)crossingsi.e.,7days.Onmostoftheoccasions,theMSBcrossingdayisassociatedwithamaximumof
