Linear and Nonlinear Evolution of the Parker Instability of Magnetic-Flux Sheets in Co-Rotating Coordinates

Chou Wenchien; Tajima Toshiki; Matsumoto Ryoji; Shibata Kazunari

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Linear and Nonlinear Evolution of the Parker Instability of Magnetic-Flux Sheets in Co-Rotating Coordinates

机译：在同向旋转坐标下磁通片的帕克不稳定性的线性和非线性演化

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Wepresentastudyofthemagneticbuoyancyinstability(orParkerinstability)ofstellaratmospheres,inparticularthatoftheeffectoftheCoriolisforce,viaalinearstabilityanalysisandnonlinear3-DMHDsimulations.Wefindthatfastrotationstabilizesthismodeforatoroidalfluxsheetlocatedneartotheequator:magneticfluxsheetsinlow-latituderegionsarelocallystable,whilethegrowthrateofthefluxsheetneartothepolarzoneisnotmuchreducedbytheCorioliseffect.Thismayexplaintheobservationalresultthatstellarspotsoffastrotatingstarsappeartowardthepolarregion.AnothereffectoftheCoriolisforceisthatthereisacut-offrotationalangularvelocityabovewhichthelong-wavelengthtransverseperturbationsaremoreunstablethantheshortwavelengthones.Thismayexplainwhylargestellarpatchesareobservedinfastrotatingstars.3-Dsimulationsofmagneticfluxsheetsunderbuoyancyinstabilityhavealsobeencarriedoutinco-rotatingCartesiancoordinates.ThesimulationresultsshowthatthecombinationofthebuoyancyinstabilityandtheCorioliseffectgivesrisetoamechanismtotwistthemagnetic-fluxsheetembeddedinthesolar(orstellar)atmosphereofaslowlyrotatingstar(suchastheSun),emergingtothesurfacewithahelicalstructure.WesuggestthatthiscanbeamodeltoexplaintheS-shapedactiveregionsinthelowlatitudesoftheSunshowninthesoftX-raypicturetakenbytheYohkohsatellite.

机译：Wepresentastudyofthemagneticbuoyancyinstability（orParkerinstability）ofstellaratmospheres，inparticularthatoftheeffectoftheCoriolisforce，viaalinearstabilityanalysisandnonlinear3-DMHDsimulations.Wefindthatfastrotationstabilizesthismodeforatoroidalfluxsheetlocatedneartotheequator：magneticfluxsheetsinlow-latituderegionsarelocallystable，whilethegrowthrateofthefluxsheetneartothepolarzoneisnotmuchreducedbytheCorioliseffect.Thismayexplaintheobservationalresultthatstellarspotsoffastrotatingstarsappeartowardthepolarregion.AnothereffectoftheCoriolisforceisthatthereisacut-offrotationalangularvelocityabovewhichthelong-wavelengthtransverseperturbationsaremoreunstablethantheshortwavelengthones.Thismayexplainwhylargestellarpatchesareobservedinfastrotatingstars.3-Dsimulationsofmagneticfluxsheetsunderbuoyancyinstabilityhavealsobeencarriedoutinco-rotatingCartesiancoordinates.ThesimulationresultsshowthatthecombinationofthebuoyancyinstabilityandtheCorioliseffectgivesrisetoamechanismtotwistthemagnetic-fluxsh在低速旋转的恒星（例如太阳）的太阳（主星）大气层中，它们以螺旋状结构出现在表面。我们建议可以用这种模型在低纬度的软X射线太阳系X射线照片上解释S形活动区域。

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《PASJ: Publications of the Astronomical Society of Japan》 |1997年第3期|共页
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Chou Wenchien; Tajima Toshiki; Matsumoto Ryoji; Shibata Kazunari;
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7. Linear and Nonlinear Evolution of the Parker Instability of Magnetic-Flux Sheets in Co-Rotating Coordinates [O] . Wenchien Chou, Toshiki Tajima, Ryoji Matsumoto, 1997

机译：共旋转坐标中磁通薄片的派克不稳定性的线性和非线性演变

Linear and Nonlinear Evolution of the Parker Instability of Magnetic-Flux Sheets in Co-Rotating Coordinates

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