木星磁尾重联产生的磁通量管向内运动的数值模拟
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摘要
本文通过利用包含离心力的自洽、轴对称稳态木星磁层模型,以及等离子体细丝运动理论对磁尾重联产生的磁通量管向内输运进行研究.基于细丝运动理论模型,通过MHD数值模拟我们可以得到磁通量管随时间变化的许多特性.模拟结果表明,重联产生的磁通量管向内运动可到达10RJ以内,磁通量管赤道部分的速度可以达到350km·s-1左右,表现出很强的向行星方向的流动.初始磁通量管中的等离子体密度和压强均小于周围介质,随着它迅速向木星方向运动,它的等离子体密度由于体积压缩逐渐上升,等离子体压强则逐渐上升到与周围介质相当.磁通量管在电离层上足点向赤道方向的运动滞后于它在赤道面上向行星方向的运动.
In this paper,through utilizing the self-consistent axisymmetric stationary model of the Jovian magnetosphere including the effect of centrifugal force,the inward motion of the flux tube generated by reconnection was studied via applying the"theory of thin filament motion".Based on the thin filament model,some properties of time development of magnetic flux tube can be obtained from the magnetohydrodynamic(MHD)numerical simulation.The results show that the flux tube generated by reconnection can reach within 10 RJ,the velocity of the portion of the flux tube near the equator can reach 350 km·s-1,and the motion of the flux tube displays a strong planetward flow.Though the density and plasma pressure in the flux tube initially is lower than its neighbors,its density increases gradually owing to compression of volume and plasma pressure rises to values comparable to its neighbors as it moves quickly towards Jupiter.The equatorward motion of the ionospheric end of the flux tube is delayed relative to its motion toward Jupiter in the equatorial plane.
In this paper,through utilizing the self-consistent axisymmetric stationary model of the Jovian magnetosphere including the effect of centrifugal force,the inward motion of the flux tube generated by reconnection was studied via applying the"theory of thin filament motion".Based on the thin filament model,some properties of time development of magnetic flux tube can be obtained from the magnetohydrodynamic(MHD)numerical simulation.The results show that the flux tube generated by reconnection can reach within 10 RJ,the velocity of the portion of the flux tube near the equator can reach 350 km·s-1,and the motion of the flux tube displays a strong planetward flow.Though the density and plasma pressure in the flux tube initially is lower than its neighbors,its density increases gradually owing to compression of volume and plasma pressure rises to values comparable to its neighbors as it moves quickly towards Jupiter.The equatorward motion of the ionospheric end of the flux tube is delayed relative to its motion toward Jupiter in the equatorial plane.
引文
Bagenal F,McNutt R L,Richardson J D.1986.From the Io Torus to the Plasma and Sheet:Plasma Processes Revealed by Voyager.Iowa City:Univ.of Iowa,paper presented at 2nd Neil Brice Symposium on the Magnetospheres of the Outer Planets.
Bagenal F.1994.Empirical model of the Io plasma torus:Voyager measurements.Journal of Geophysical Research:Space Physics,99(A6):11043-11062,doi:10.1029/93JA02908.
Caudal G.1986.A self-consistent model of Jupiter′s magnetodisc including the effects of centrifugal force and pressure.Journal of Geophysical Research:Space Physics,91(A4):4201-4221,doi:10.1029/JA091iA04p04201.
Chen C X,Wolf R A.1999.Theory of thin-filament motion in Earth′s magnetotail and its application to bursty bulk flows.Journal of Geophysical Research:Space Physics,104(A7):14613-14626,doi:10.1029/1999JA900005.
Chen C X.2003.Numerical simulation of the Io-torus-driven radial plasma transport.Journal of Geophysical Research:Space Physics,108(A10):1376,doi:10.1029/2002JA009460.
Dessler A J.1983.Physics of the Jovian Magnetosphere.New York.Cambridge University Press,353-394.
Cowley S W H,Bunce E J.2001.Origin of the main auroral oval in Jupiter′s coupled magnetosphere-ionosphere system.Planetary and Space Science,49(10):1067-1088,doi:10.1016/S0032-0633(00)00167-7.
Dumont M,Grodent D,Radioti A,et al.2014.Jupiter′s equatorward auroral features:Possible signatures of magnetospheric injections.Journal of Geophysical Research:Space Physics,119(12):10068-10077,doi:10.1002/2014JA020527.
Ge Y S,Russell C T,Khurana K K.2010.Reconnection sites in Jupiter′s magnetotail and relation to Jovian auroras.Planetary and Space Science,58(11):1455-1469,doi:10.1016/j.pss.2010.06.013.
Guo R L,Yao Z H,Wei Y,et al.2018.Rotationally driven magnetic reconnection in Saturn′s dayside.Nature Astronomy,2(8):640-645,doi:10.1038/s41550-018-0461-9.
Hill T W.1979.Inertial limit on corotation.Journal of Geophysical Research:Space Physics,84(A11):6554-6558,doi:10.1029/JA084iA11p06554.
Kittel C.1969.Thermal Physics.Hoboken N J:,John Wiley.
Kivelson M G,Khurana K K,Russell C T,et al.1997.Galileo at Jupiter:Changing states of the magnetosphere and first looks at Io and Ganymede.Advances in Space Research,20(2):193-204.
Lackner K.1970.Deformation of a magnetic dipole field by trapped particles.Journal of Geophysical Research,75(16):3180-3192,doi:10.1029/JA075i016p03180.
Liu Z X.1982.Modified disc model of Jupiter′s magnetosphere.Journal of Geophysical Research:Space Physics,87(A3):1691-1695,doi:10.1029/JA087iA03p01691.
Mauk B H,Gary S A,Kane M,et al.1996.Hot plasma parameters of Jupiter′s inner magnetosphere.Journal of Geophysical Research:Space Physics,101(A4):7685-7695,doi:10.1029/96JA00006.
Pontius D H Jr,Wolf R A.1990.Transient flux tubes in the terrestrial magnetosphere.Geophysical Research Letters,17(1):49-52,doi:10.1029/GL017i001p00049.
Russell C T.2001.The dynamics of planetary magnetospheres.Planetary and Space Science,49(10-11):1005-1030,doi:10.1016/S0032-0633(01)00017-4.
Siscoe G L,Summers D.1981.Centrifugally driven diffusion of Iogenic plasma.Journal of Geophysical Research:Space Physics,86(A10):8471-8479,doi:10.1029/JA086iA10p08471.
Wang Y,Chen C X.2008.Numerical simulation of radial plasma transport in the Saturn′s magnetosphere.Chinese Journal of Geophysics(in Chinese),51(3):635-642.
Wang Y X,Guo X C,Tang B B,et al.2018.Modeling the Jovian magnetosphere under an antiparallel interplanetary magnetic field from a global MHD simulation.Earth and Planetary Physics,2(4):303-309,doi:10.26464/epp2018028.
Woch J,Krupp N,Kivelson M G,et al.1999.Plasma sheet dynamics in the Jovian magnetotail:Signatures for substormlike processes?.Geophysical Research Letters,26(14):2137-2140,doi:10.1029/1999GL900493.
Yang Y F,Chen C X.2009.Motion of magnetic flux tube produced by reconnection in Earth′s magnetotail.Chinese Journal of Geophysics(in Chinese),52(5):1131-1137.
Yang Y S,Wolf R A,Spiro R W,et al.1994.Numerical simulation of torus-driven plasma transport in the Jovian magnetosphere.Journal of Geophysical Research:Space Physics,99(A5):8755-8770,doi:10.1029/94JA00142.
Zimbardo G.1993.Observable implications of tearing-mode instability in Jupiter′s nightside magnetosphere.Planetary and Space Science,41(5):357-361,doi:10.1016/0032-0633(93)90069-E.
王翼,陈出新.2008.土星磁层等离子体径向输运的数值模拟.地球物理学报,51(3):635-642.
杨亚芬,陈出新.2009.地球磁尾中重联产生的磁流通管的运动.地球物理学报,52(5):1131-1137.
Bagenal F.1994.Empirical model of the Io plasma torus:Voyager measurements.Journal of Geophysical Research:Space Physics,99(A6):11043-11062,doi:10.1029/93JA02908.
Caudal G.1986.A self-consistent model of Jupiter′s magnetodisc including the effects of centrifugal force and pressure.Journal of Geophysical Research:Space Physics,91(A4):4201-4221,doi:10.1029/JA091iA04p04201.
Chen C X,Wolf R A.1999.Theory of thin-filament motion in Earth′s magnetotail and its application to bursty bulk flows.Journal of Geophysical Research:Space Physics,104(A7):14613-14626,doi:10.1029/1999JA900005.
Chen C X.2003.Numerical simulation of the Io-torus-driven radial plasma transport.Journal of Geophysical Research:Space Physics,108(A10):1376,doi:10.1029/2002JA009460.
Dessler A J.1983.Physics of the Jovian Magnetosphere.New York.Cambridge University Press,353-394.
Cowley S W H,Bunce E J.2001.Origin of the main auroral oval in Jupiter′s coupled magnetosphere-ionosphere system.Planetary and Space Science,49(10):1067-1088,doi:10.1016/S0032-0633(00)00167-7.
Dumont M,Grodent D,Radioti A,et al.2014.Jupiter′s equatorward auroral features:Possible signatures of magnetospheric injections.Journal of Geophysical Research:Space Physics,119(12):10068-10077,doi:10.1002/2014JA020527.
Ge Y S,Russell C T,Khurana K K.2010.Reconnection sites in Jupiter′s magnetotail and relation to Jovian auroras.Planetary and Space Science,58(11):1455-1469,doi:10.1016/j.pss.2010.06.013.
Guo R L,Yao Z H,Wei Y,et al.2018.Rotationally driven magnetic reconnection in Saturn′s dayside.Nature Astronomy,2(8):640-645,doi:10.1038/s41550-018-0461-9.
Hill T W.1979.Inertial limit on corotation.Journal of Geophysical Research:Space Physics,84(A11):6554-6558,doi:10.1029/JA084iA11p06554.
Kittel C.1969.Thermal Physics.Hoboken N J:,John Wiley.
Kivelson M G,Khurana K K,Russell C T,et al.1997.Galileo at Jupiter:Changing states of the magnetosphere and first looks at Io and Ganymede.Advances in Space Research,20(2):193-204.
Lackner K.1970.Deformation of a magnetic dipole field by trapped particles.Journal of Geophysical Research,75(16):3180-3192,doi:10.1029/JA075i016p03180.
Liu Z X.1982.Modified disc model of Jupiter′s magnetosphere.Journal of Geophysical Research:Space Physics,87(A3):1691-1695,doi:10.1029/JA087iA03p01691.
Mauk B H,Gary S A,Kane M,et al.1996.Hot plasma parameters of Jupiter′s inner magnetosphere.Journal of Geophysical Research:Space Physics,101(A4):7685-7695,doi:10.1029/96JA00006.
Pontius D H Jr,Wolf R A.1990.Transient flux tubes in the terrestrial magnetosphere.Geophysical Research Letters,17(1):49-52,doi:10.1029/GL017i001p00049.
Russell C T.2001.The dynamics of planetary magnetospheres.Planetary and Space Science,49(10-11):1005-1030,doi:10.1016/S0032-0633(01)00017-4.
Siscoe G L,Summers D.1981.Centrifugally driven diffusion of Iogenic plasma.Journal of Geophysical Research:Space Physics,86(A10):8471-8479,doi:10.1029/JA086iA10p08471.
Wang Y,Chen C X.2008.Numerical simulation of radial plasma transport in the Saturn′s magnetosphere.Chinese Journal of Geophysics(in Chinese),51(3):635-642.
Wang Y X,Guo X C,Tang B B,et al.2018.Modeling the Jovian magnetosphere under an antiparallel interplanetary magnetic field from a global MHD simulation.Earth and Planetary Physics,2(4):303-309,doi:10.26464/epp2018028.
Woch J,Krupp N,Kivelson M G,et al.1999.Plasma sheet dynamics in the Jovian magnetotail:Signatures for substormlike processes?.Geophysical Research Letters,26(14):2137-2140,doi:10.1029/1999GL900493.
Yang Y F,Chen C X.2009.Motion of magnetic flux tube produced by reconnection in Earth′s magnetotail.Chinese Journal of Geophysics(in Chinese),52(5):1131-1137.
Yang Y S,Wolf R A,Spiro R W,et al.1994.Numerical simulation of torus-driven plasma transport in the Jovian magnetosphere.Journal of Geophysical Research:Space Physics,99(A5):8755-8770,doi:10.1029/94JA00142.
Zimbardo G.1993.Observable implications of tearing-mode instability in Jupiter′s nightside magnetosphere.Planetary and Space Science,41(5):357-361,doi:10.1016/0032-0633(93)90069-E.
王翼,陈出新.2008.土星磁层等离子体径向输运的数值模拟.地球物理学报,51(3):635-642.
杨亚芬,陈出新.2009.地球磁尾中重联产生的磁流通管的运动.地球物理学报,52(5):1131-1137.