有關(guān)太陽(yáng)磁場(chǎng)的無(wú)力場(chǎng)模型及計(jì)算方法研究.pdf

1、西安電子科技大學(xué)博士論文有關(guān)太陽(yáng)磁場(chǎng)的無(wú)力場(chǎng)模型及計(jì)算方法研究作者：李柱恒導(dǎo)師：宋國(guó)鄉(xiāng)，顏毅華學(xué)科：應(yīng)用數(shù)學(xué)學(xué)位：理學(xué)博士二OO五年10月中國(guó)兩安y82315lAbstractWbhavedonetheinveStigationaboutsolarmagneticfieldinthefollowingrespects：1Wehaveintroducedindetailmainmethodsofsolvingsolarlinearforo

2、e—freefieldmodels，discussedtheiradvantagesanddisadvantagesandunderstoodfullytherelationsofthemethodsWealsomadecommentsonsomeworksaboutlinearforcefreefield2Aboundaryintegralformulationdescribingconstant—aforce—freefieldwi

3、thfiniteenergycontentinthesemi—infinitespaceabovethesunWaSproposed(Yan，1995)，thisformulmioncontainsboundaryfieldanditsnormaIgradientunderintegralsignWepresentanewdirectboundaryintegralforillulationbasedontheformulationof

4、YahintermoftheboundaryfieldonlyComparedwithYan’sformulation，tocalculatefieldusingthisnewformulationhasadvantagesofspeedinessandnicetyTwoexamplesaregivenforindicatingnonnecessityoftheasymptoticconditionofthemodel(Yan1995)

5、3Aboundaryintegralequationrepresentationforthenonconstant盤foroefreefieldinspaceoutsidetheSunwasinvestigatedbyYall＆SakuraiwhointroducedalocaJparameter五insteadoftheforcefreefactorawhichshouldsatisfyaproposedconditionThenth

6、efieldatanypointinspacecanberepresentedbytheboundaryintegralequationInchapter5，itisjustifiedthat，foraclosedformnonconstantfoice—freefieldproblemwithfiniteenergycontentinfreespacearoundtheSunasinLow&LousuchrealAsolutionsd

7、oexist4Thepropertyofboundaryintegralequation(Yan&Sakurai20001hasbeendiscussed(Lieta12004)，whereakindofimportantsingularitysurfaceintegrationcanbefoundInordertocalculatethiskindofintegration，webuildthesamedistributionprin

8、cipletiemannintegralandgivesomeimportantapplicationsofit5Adirectboundaryintegralformulationforforce—freemagneticfieldwithfiniteenergycontentinthesemispaceabovetheSunispresentedThenonlinearforeefreefieldmodelistranslatedi

9、ntoanonlinearprogrammingproblemWehaveproposedanoptimalmethodtonumericallysolvethenonlinearprogrammingproblemsothatnonlinearforoefreefieldsolutioncanbeobtainedAtestcasestudyhasbeencarriedouttodemonstratetheconvergence，acc

10、uracyandefficiencyofthenumericalproceduresTheagreementbetweennumericalandexactresultsvalidatethecorrectnessandmeritsofthenewformulationandcomputationalprocedureproposed6Theboundaryintegralequation(Yan&Sakurai，2000)contai

11、nsboundarymagneticfieldanditsnormalgradientunderrightintegralsignWepresentanewdirectboundaryintegralequationintermoftheboundarymagneticfieldonlyWhilecalculatingmagneticfieldvaluesatspacepointswiththeequationofYan&Sakurai

12、，wemustfirstcalculatenormalgradientofmagneticfieldattheboundarybyusingboundaryelementmethod，anditmusttakesmuchtimetocalculatemagneticnormalgradient；butwhilecalculatingmagneticfieldwithnewdirectequation，weneednotcalculate

13、magneticnormalgradientComparedwithYan‘sequation，tocalculatefieldusingthisnewequationhasadvantageofspeedinessKeywords：solarmagneticfieldforcefreefieldboundaryintegralequationboundaryelementmethodsamedistributionprinciples