第76章 对火星轨道变化问题的最后解释(9/12)
icitiesandinclinationsofercuryonatime-scaleofseveral109yr.oever,theeffectoftheossibleinstabilityoftheorbitofercurymaynotfatallyaffecttheglobalstabilityoftheholelaarysystemoingtothesmallmassofercury.eillmentionbrieflythelong-termorbitalevolutionofercurylaterinection4usinglo-assfilteredorbitalelements.>
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heorbitalmotionoftheouterfivelasseemsrigorouslystableandquiteregularoverthistime-san(seealsoection5).>
3.2ime–frequencymas>
lthoughthelaarymotionexhibitsverylong-termstabilitydefinedasthenon-existenceofcloseencounterevents,thechaoticnatureoflaarydynamicscanchangetheoscillatoryeriodandamlitudeoflaaryorbitalmotiongraduallyoversuchlongtime-sans.vensuchslightfluctuationsoforbitalvariationinthefrequencydomain,articularlyinthecaseofarth,canotentiallyhaveasignificanteffectonitssurfaceclimatesystemthroughsolarinsolationvariation(cf.erger1988).>
ogiveanovervieofthelong-termchangeineriodicityinlaaryorbitalmotion,eerformedmanyfastouriertransformations(s)alongthetimeaxis,andsuerosedtheresultingeriodgramstodrato-dimensionaltime–frequencymas.hesecificaroachtodraingthesetime–frequencymasinthisaerisverysimle–muchsimlerthantheaveletanalysisoraskar's(1990,1993)frequencyanalysis.>
ividethelo-assfilteredorbitaldataintomanyfragmentsofthesamelenh.helenhofeachdatasegmentshouldbeamultileof2inordertoalythe.>
achfragmentofthedatahasalargeoverlaingart:forexamle,hentheithdatabeginsfromt=tiandendsatt=ti+,thenextdatasegmentrangesfromti+δ≤ti+δ+,hereδ?.econtinuethisdivisionuntilereachacertainnumberbyhichtn+reachesthetotalinteg
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