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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Observations of the nightside ionosphere of Mars by the Mars Express Radio Science Experiment (MaRS)
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Observations of the nightside ionosphere of Mars by the Mars Express Radio Science Experiment (MaRS)

机译：火星快车无线电科学实验（MaRS）对火星夜空电离层的观测

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[1] The vertical structure of the nightside ionosphere of Mars and its dependence on solar zenith angle are currently poorly determined, as is the importance of two key sources of nightside plasma, electron precipitation and transport of dayside plasma. We examined 37 electron density profiles of the ionosphere of Mars at solar zenith angles of 101°–123°obtained by the Mars Express Radio Science Experiment (MaRS) between 18 August and 1 October 2005. In general, solar activity was low during this period, although several solar energetic particle events did occur. The results show that (1) trends in peak electron density and altitude with solar zenith angle are consistent with transport of dayside plasma as an important plasma source up to 115o, but not higher; (2) peak altitudes of around 150 km observed at larger (>115o) solar zenith angles are consistent with simulated plasma production by electron precipitation; and (3) peak altitudes observed during solar energetic particle events are at 90 km, consistent with accepted models. Solar energetic particle events can be the main source of nightside plasma. These results challenge current models of the nightside ionosphere, including their implications for plasma sources. The total electron content is correlated with peak electron density, requiring explanation. Due to the geographical distribution of this data set (latitudes poleward of 38oN), we do not explore the influence of crustal field strength and direction on the nightside ionosphere.
机译：[1]目前尚无法确定火星夜间电离层的垂直结构及其对太阳天顶角的依赖性，以及夜间等离子体的两个关键来源，电子沉淀和日间等离子体传输的重要性。我们通过2005年8月18日至10月1日的火星快速无线电科学实验（MaRS）获得了在101-123°的太阳天顶角上火星电离层的37个电子密度分布图。总体而言，在此期间太阳活动低，尽管确实发生了几次太阳高能粒子事件。结果表明：（1）峰值电子密度和高度随太阳天顶角的变化趋势与作为重要等离子体源的日间等离子体的输运相一致，但不超过11​​5o; （2）在更大的太阳天顶角（> 115o）处观察到的约150 km的峰值高度与通过电子沉淀产生的模拟等离子体一致; （3）太阳高能粒子事件期间观测到的峰值高度在90 km，与公认的模型一致。太阳高能粒子事件可能是夜间等离子体的主要来源。这些结果挑战了夜间电离层的当前模型，包括它们对等离子体源的影响。总电子含量与峰值电子密度相关，需要说明。由于该数据集的地理分布（纬度向南偏向38oN），因此我们没有探讨地壳场强和方向对夜间电离层的影响。

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