%0 Journal Article
%T Electrodynamiccouplinginthesolarwind-magnetosphere-ionospheresystem
%A Hu
%A Youqiu
%A Wang
%A Chi
%J 空间科学学报
%P 321-332
%D 2010
%X ThispaperpresentsabriefsummaryofourrecentworkbasedonglobalMHDsimulationsoftheSolarwind-Magnetosphere-Ionosphere(SMI)systemwithemphasisontheelectrodynamiccouplinginthesystem.Themainconclusionsobtainedaresummarizedasfollows.(1)AsamaindynamooftheSMIsystem,thebowshockcontributestobothregion1Field-AlignedCurrent(FAC)andcross-tailcurrent.UnderstronginterplanetarydrivingconditionsandmoderateAlfvenMachnumbers,thebowshock'scontributionmayexceedmorethanfiftypercentofthetotalofeitherregion1orcross-tailcurrents.(2)Intermsofmorethan100simulationrunswithduesouthwardInterplanetaryMagneticField(IMF),wehavefoundacombinedparameterf=EswPswMA-1/2(Esw,Psw,andMAarethesolarwindelectricfield,rampressure,andAlfvenMachnumber,respectively):boththeionospherictranspolarpotentialandthemagnetopausereconnectionvoltagevarylinearlywithfforsmallf,butsaturateforlargef.(3)Thereconnectionvoltageisapproximatelyfittedbysin3/2θIMF/2,whereθIMFistheIMFclockangle.Theionospherictranspolarpotential,thevoltagealongthepolarcapboundary,andtheelectricfieldsalongthemerginglinehoweverdefinedtheymaybe,responddifferentlytoθIMF,soitisnotjustifiedtotakethemassubstitutesforthereconnectionvoltage.
%K Earth'smagnetosphere
%K Ionosphere
%K Electrodynamiccoupling
%K Numericalsimulation
%U http://www.cjss.ac.cn/CN/abstract/abstract1479.shtml