Qin JunFeng, Curry Shannon, Mitchell Dave, Xu Shaosui, Lillis Robert, Andersson Laila
Space Sciences Laboratory University of California Berkeley CA USA.
Laboratory for Atmospheric and Space Physics University of Colorado Boulder CO USA.
Geophys Res Lett. 2024 Nov 28;51(22):e2024GL110838. doi: 10.1029/2024GL110838. Epub 2024 Nov 22.
We investigate how the Martian dayside ionospheric structure is modified by crustal magnetic field (CMF) strength and upstream solar wind pressure by analyzing electron density data from the Langmuir Probe and Waves instrument onboard the MAVEN (Mars Atmosphere and Volatile EvolutioN) spacecraft. We find that the electron density above the exobase is anticorrelated with the ratio of solar wind's normal dynamic pressure ( ) to CMF magnetic pressure ( ). We also analyze the electron density behavior across different magnetic topologies as a function of . The extremely low electron density in the draped topology relates to ionopause-like structures. The lower electron density in the closed and open topology under higher may be attributed to a downward force, potentially the × force in the case of closed topology. This study highlights the complex interplay between solar wind and CMF in influencing the Martian dayside upper ionosphere.
我们通过分析火星大气与挥发物演化探测器（MAVEN）上的朗缪尔探针和波动仪器获取的电子密度数据，研究了地壳磁场（CMF）强度和上游太阳风压力如何改变火星白昼侧电离层结构。我们发现，外逸层上方的电子密度与太阳风法向动压（ ）与CMF磁压（ ）之比呈反相关。我们还分析了不同磁拓扑结构中电子密度随 的变化行为。悬垂拓扑结构中极低的电子密度与类电离层顶结构有关。在较高的 条件下，封闭和开放拓扑结构中较低的电子密度可能归因于向下的力，在封闭拓扑结构的情况下可能是 × 力。这项研究突出了太阳风与CMF在影响火星白昼侧上层电离层方面的复杂相互作用。
