A three-dimensional adaptive magnetohydrodynamic(MHD)model is used to investigate the energy flow from the solar wind to the magnetosphere as response to sudden turnings of the interplanetary magnetic field(IMF)during...
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A three-dimensional adaptive magnetohydrodynamic(MHD)model is used to investigate the energy flow from the solar wind to the magnetosphere as response to sudden turnings of the interplanetary magnetic field(IMF)during a substorm event on 5 June *** this unsettling period,the energy input was strongly *** size of magnetospheric cavity is very relevant to solar wind dynamic *** to the positive magnetic dip,the distribution of energy transfer on the two hemispheres of magnetopause is asymmetrical,most energy is transferred from north hemisphere sunward of XGSE>0 *** electromagnetic and mechanical energy inputs increase rapidly with the shock foot arriving,while the electromagnetic energy rises inch by inch with a sudden southward turning IMF after magnetopause bathed in a northward IMF for *** a nearly invariable By component of IMF,under southward IMF the most electromagnetic energy is transferred from the plane(anti-)parallel to IMF clock angle and it transferred from the plane perpendicular to IMF clock angle for northward IMF,while the significant mechanical energy input mainly occurs on the polar cusp for northward IMF and near equatorial plane of dayside magnetopause for southward *** identifies distinguishable locations of the transferred Poynting flux distributions in X-axis which are caused by low-latitude reconnection and high-latitude reconnection,therefore it is inferred that the two kinds of reconnection could coexist on the magnetopause during northward IMF but with a large By *** is also shown that the traditional energy transfer parameters from solar wind conditions do not contain any of residual or history effects,thus sometimes can't reflect the right response to the solar wind variations.
Session:空间天气与人类活动-业务应用Type of presentation:口头报告Key word:针对我国航天领域发展规划,选取热层大气密度模式这一影响载人航天工程轨道确定与预报精度的关键因素,分析载人航天工程中MSISE、DTM、Jacchia等三类热层大...
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Session:空间天气与人类活动-业务应用Type of presentation:口头报告Key word:针对我国航天领域发展规划,选取热层大气密度模式这一影响载人航天工程轨道确定与预报精度的关键因素,分析载人航天工程中MSISE、DTM、Jacchia等三类热层大气密度模式的应用现状,研究模式在航天应用中的难点及修正方法,并在交会对接任务中试验验证。本文首先统计分析磁暴事件对应的密度变化,对比不同太阳和地磁活动水平下模式误差对轨道预报精度的影响,发现中强及以下磁暴期(-250≤Dst<-50)载人航天轨道大气密度平均增幅为105%,而扰动日(Ap=20)的轨道预报误差显著大于平静日(Ap=5),径向和迹向的误差均在4倍左右。进而以400km为载人航天代表高度
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