Trans-Fast MHD Winds in a Pulsar Magnetosphere

Publications of the Astronomical Society of Japan

Shibata, Shinpei¹  Takahashi, Masaaki² 

[1] Department of Physics, Yamagata University, Yamagata, Yamagata 990;Department of Physics and Astronomy, Aichi University of Education, Kariya, Aichi 448 E-mail (MT):

关键词: "magnetohydrodynamics (MHD)";    "Nebulae: individual (Crab nebula)";    Pulsars;    "Stars: winds";   

DOI  :  10.1093/pasj/50.2.271

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Weconsidertheproblemofhowapulsarwinddominatedbyelectro-magneticenergyconvertsitselfintoakineticenergy-dominatedwind,thatisrequiredbymagnetohydrodynamical(MHD)modelsofinteractionbetweenthepulsarandthenebula.Itisknownthatstationary,ideal-MHDwindmodelsbasedonradialconfigurationsareincapableofexplainingtheenergyconversionfromtheelectro-magneticenergytotheplasma'skineticenergy.Fornon-radialfieldgeometries,weconsideradetailedanalysisofthecriticalconditionsoftrans-fastMHDwindsanddiscusstheeffectsofthemagneticfieldonthewindacceleration.Althoughtheflowpropertiesassociatewiththemagneticfluxtubedivergence,wesurveytheacceptablerangesofthewindparametersasapulsarwind.Further,wedemonstratetheCrabpulsarwindwithamagneticfluxtubedivergingas∝x−0.4.WeseethattherapidaccelerationiscausedbyanearbyAlfvénpoint;thevelocityisalmostterminatedwithinseveralthouthandtimesofthefastmagnetosonicpoint;thus,thekineticenergy-dominatedwindisrealized.

【 授权许可】

Unknown