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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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