The Ionopause at Mars and Its Correlation With Magnetic Topology and Plasma Pressure

IF 2.6 2区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS
Katerina Stergiopoulou, Beatriz Sánchez-Cano, Mark Lester, Christopher M. Fowler, David J. Andrews, Shaosui Xu, Niklas J. T. Edberg, Simon Joyce, Mats Holmström, Jasper S. Halekas, Dikshita Meggi, Anna K. Turner, Jacob R. Gruesbeck
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Abstract

We utilize Mars Atmosphere and Volatile Evolution (MAVEN) observations to investigate the ionopause boundary at Mars, the formation process of which is not yet well described. We focus on the eighth deep dip campaign (DD8), which consists of 50 consecutive orbits, and we develop an automated routine to identify ionopause boundaries in electron density and temperature data. We find ionopause boundaries in 54 out of 100 ionospheric crossings and an average ionopause altitude of 368 km. Having detected the ionopause boundaries, we then examine in detail all the DD8 orbits using complementary observations from several MAVEN instruments. We show examples of two orbits, illustrating how the shapes of the topside ionosphere and ionopause can differ among ionospheric crossings and how the ionopause formation is correlated with changes in magnetic topology and the plasma pressure balance between the ionosphere and the magnetic pile-up region (MPR). We find that 70% of the detected ionopauses are formed where there are changes in magnetic topology, particularly from closed to either open or draped magnetic field lines, and 80% of the boundaries are also formed where the ionospheric plasma pressure becomes equal to the plasma pressure of the MPR. Finally, we confirm that the ionopause boundary is more likely to be formed under high solar wind dynamic pressure conditions.

Abstract Image

火星电离层顶及其与磁拓扑和等离子体压力的关系
我们利用火星大气和挥发演化(MAVEN)观测资料来研究火星电离层边界,其形成过程尚未得到很好的描述。我们专注于第八次深浸运动(DD8),它由50个连续的轨道组成,我们开发了一个自动化的程序来识别电子密度和温度数据中的电离层边界。我们在100个电离层交叉点中发现54个电离层顶边界,电离层顶平均高度为368公里。在探测到电离层边界之后,我们将利用几个MAVEN仪器的互补观测,详细检查所有DD8的轨道。我们展示了两个轨道的例子,说明电离层顶部和电离层顶的形状如何在电离层交叉中不同,以及电离层顶的形成如何与磁拓扑结构的变化以及电离层和磁堆积区(MPR)之间的等离子体压力平衡相关。我们发现70%的检测到的电离层是在磁拓扑变化的地方形成的,特别是从闭合到开放或覆盖的磁力线,80%的边界也形成在电离层等离子体压力等于MPR的等离子体压力的地方。最后,我们证实了在高太阳风动压条件下电离层顶边界更有可能形成。
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来源期刊
Journal of Geophysical Research: Space Physics
Journal of Geophysical Research: Space Physics Earth and Planetary Sciences-Geophysics
CiteScore
5.30
自引率
35.70%
发文量
570
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