《Numerical simulation of the Hall effect in magnetized accretion disks with the Pluto code》.pdf
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《Numerical simulation of the Hall effect in magnetized accretion disks with the Pluto code》.pdf
RAA 2014Vo1.14No.1.93—103 doi:10.1088/1674__4527/14/I/008
Researchin
http.//www.raa-journal,org http://www.iop.org/journals/raa Astronomyand
Asrtophysics
NumericalsimulationoftheHalleffectinmagnetizedaccretion
diskswiththePlutocode
MohammadNakhaei1,vGhasem Safaei1andShahram Abbassi2,3
.
SchoolofPhysics,DamghanUniversity,P.O.Box36715-364,Damghan,Iran
0DepartmentofPhysics,SchoolofSciences,FerdowsiUniversiytofMashhad,Mashhad,
91775—1436,Iran
3SchoolofAsffonomy,InstituteforResearchinFundamentalSciences,RO.Box19395.5531,
Tehran,Iran;abbassi@ipm.ir
Received2013April4;accepted2013August21
AbstractWeinvestigatetheHalleffectinastandradmagnetizedaccretiondiskwhich
isaccompaniedbydissipationduetoviscosiytandmagneticresistiviyt.Byconsider-
ingna initialmagneticfield,usingthePLUTO code,weperofrrnanumericalmagne—
tohvdrodynamicsimulationinordertosutdythee岱ectOfHalldiffusiononhtephysi—
calstrucutreofthedisk.Currentdensiytandtemperatureofthediskaresignificantly
modifiedbvHal1diflusion,buthteglobalstructureofthediskisnotsubstantially
affected.Thechna gesinhtecurrentdensitiesandtemperatureofhtediskleadtoa
modificationinthediskluminosiytandradiation.
Keywords:Halleffect--·-——accretiondisks
1 INTRoDUCT10N
Theaccretionprocessisoneofhtemostimportantpartsofstarformationtheory.Accretiondisks
arethebirthplacesofstarsna dplna ets.Themechanism bywhichangulramomenutm islostbythe
materialinaccretiondisksisaclassicproblem inastrophysics.Amajordifficulytariseswhenwe
haveamagneticfield,astheofrmationandevolutionofthediskaregreatlyaffectedbysuchfields.
Magnetictensionappearstobeoneofhtemain sourcesoftorquerequiredtotrna sportangular
momenutm from themateria1inhtedisktothe
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