SchumannResonance舒曼共振

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1、SchumannResonancefromEarthtoTitanDanaIonitaSchoolofEarth&AtmosphericSciencesGeorgiaInstituteofTechnologyOutlineDefinitionEarthcavitydimensions&propertiesTitan(properties)Huygensprobe(observations)cavitydimensions&properties(abitmorecomplex)energysource:???possibilitiesliquidoceanConclus

2、ion:2bigquestionsaboutTitanSchumannwavesResonancewavesoftheatmosphericcavityformedbetweentheEarth’ssurfaceandionosphere,twoconductivesurfaceswithanon-conductiveatmosphereSimoesetal.(2007)EarthDimensions&propertiesSurfaceconductivity(s)=0.01(land)and1(sea)Sm-1Frequencies(obs)=7.8,14,20,26,3

3、3,39,45Hz(+/-0.5Hzdaily)Cavityheight(h)=100kmRadius(Rp)=6378kmSkindepth(d)=0kmEnergysource:lightningSiinghetal.(2006)TitanCavitypropertiesIonosphereat1,200 km,63 kmh(s~10-3Sm-1)=750kmSurfaceconductivity(s)=10-10Sm-1Radius(Rp)=2575kmSkindepth(d)=100kmSimoesetal.(2008)FrequenciesonTitanHuyge

4、ns(Jan14,2005)observed:36HzELFwaveInstrumentationnoisemostlikelyruledoutassourceModelresults:13.43(19.15),28.13(34.32),43.93(49.48)HzBeghinetal(2007)Energysource???Lightningnotobserved,butnotruledoutTitanionosphere&motionofSaturn’smagnetosphereBlancetal(2002)Titan’sliquidoceanTitanisbeliev

5、edtohaveanundergroundliquidwaterlayerModelingofTitancavityshape&sizeofcavitydepthofundergroundliquidwatersurfaceSotin&Tobie(2008)FurtherWork2questionsaboutSchumannresonanceatTitan:Energysource-faintlightningpossible,notobserved-interactionswithSaturn’smagnetosphereneedtobebetterunderstoo

6、dDepthofliquidocean-thecavitypropertiescanberelativelywellconstrainedinamodelThankyou.AnyQuestions?