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ID:40557596
大小:410.97 KB
页数:19页
时间:2019-08-04
《A New Empirical Thermospheric Density Model JB2008 using new solar and geomagnetic indices》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、AIAA2008-6438ANewEmpiricalThermosphericDensityModelJB2008UsingNewSolarandGeomagneticIndices*BruceR.BowmanAirForceSpaceCommandSpaceAnalysis/A9ACbruce.bowman@peterson.af.mil719-556-3710W.KentTobiskaSpaceEnvironmentTechnologiesktobiska@spacenvironment.n
2、et310-573-4185FrankA.Marcos,CherylY.Huang,ChinS.Lin,WilliamJ.BurkeAirForceResearchLaboratoryAFRL/RVBXTAFRL.RVB.PA@hanscom.af.mil781-377-3037Anewempiricalatmosphericdensitymodel,Jacchia-Bowman2008,isdevelopedasanimprovedrevisiontotheJacchia-Bowman2006
3、modelwhichisbasedonJacchia’sdiffusionequations.Drivingsolarindicesarecomputedfromon-orbitsensordataareusedforthesolarirradiancesintheextremethroughfarultraviolet,includingx-rayandLyman-αwavelengths.Newexospherictemperatureequationsaredevelopedtorepre
4、sentthethermosphericEUVandFUVheating.Newsemiannualdensityequationsbasedonmultiple81-dayaveragesolarindicesareusedtorepresentthevariationsinthesemiannualdensitycyclethatresultfromEUVheating.GeomagneticstormeffectsaremodeledusingtheDstindexasthedrivero
5、fglobaldensitychanges.Themodelisvalidatedthroughcomparisonswithaccuratedailydensitydragdatapreviouslycomputedfornumeroussatellitesinthealtituderangeof175to1000km.ModelcomparisonsarecomputedfortheJB2008,JB2006,Jacchia1970,andNRLMSIS2000models.Accelero
6、metermeasurementsfromtheCHAMPandGRACEsatellitesarealsousedtovalidatethenewgeomagneticstormequations.*ThispaperisdeclaredaworkoftheUSGovernmentandisnotsubjecttocopyrightprotectionintheUSDODDistributionA.Approvedforpublicrelease;distributionunlimited.I
7、.Introduction1UntildevelopmentoftheJacchia-Bowman2006(JB2006)modeltypicaldensitymodelerrorsontheorder2of15%-20%onestandarddeviationwererecognizedforallempiricalmodelsdevelopedsincethemid1960s.Theselargedensitystandarddeviationscorrespondtomaximumdens
8、ityerrorsofapproximately40-60%asobservedinsatellitedragdata.Therearetwomainreasonsfortheseconsistentlylargevalues.3,4Oneistheresultofnotmodelingthesemiannualdensityvariationasafunctionofsolaractivity,andtheotherresultsfromnotmodelingthefullthermosphe
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