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Upper ionosphere of Mars is not axially symmetrical

机译:火星上电离层不是轴向对称的

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The measurements carried out by the ASPERA-3 and MARSIS experiments on board the Mars Express (MEX) spacecraft show that the upper Martian ionosphere (h ≥ 400 km) is strongly azimuthally asymmetrical. There are several factors, e.g., the crustal magnetization on Mars and the orientation of the interplanetary magnetic field (IMF) which can give rise to formation of ionospheric swells and valleys. It is shown that expansion of the ionospheric plasma along the magnetic field lines of crustal origin can produce bulges in the plasma density. The absense of a magnetometer on MEX makes the retrieval of an asymmetry caused by the IMF more difficult. However hybrid simulations give a hint that the ionosphere in the hemisphere (E) to which the motional electric field is pointed occurs more inflated than the ionosphere in the opposite (E~+) hemisphere.
机译:在火星快车(MEX)上通过ASPERA-3和MARSIS实验进行的测量表明,火星上电离层(h≥400 km)在方位角上很不对称。有几种因素,例如火星上的地壳磁化强度和行星际磁场(IMF)的方向,这些因素可能导致电离层膨胀和凹陷的形成。结果表明,电离层等离子体沿着地壳起源的磁力线膨胀会在等离子体密度中产生凸起。在MEX上缺少磁力计使得恢复由IMF引起的不对称变得更加困难。然而,混合仿真提示,运动电场所指向的半球(E)中的电离层比相反(E〜+)半球中的电离层更膨胀。

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