2007 年火星全球尘暴对诱导磁层边界位置的影响

IF 3.8 Q2 ASTRONOMY & ASTROPHYSICS The Planetary Science Journal Pub Date : 2024-06-04 DOI:10.3847/psj/ad4116
Catherine E. Regan, Andrew J. Coates, Mark Lester, Anne Wellbrock, Geraint H. Jones, Beatriz Sánchez-Cano, Philippe Garnier, Richard P. Haythornthwaite, Dikshita Meggi, Rudy A. Frahm and Mats Holmström
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引用次数: 0

摘要

火星磁层是一个敏感的系统,受太阳风条件和地壳磁场等内外因素的影响而变化。这种影响的特征可以从两个边界的位置看出:弓形冲击和诱导磁层边界(IMB)。在太阳活动频繁时,弓形冲击会靠近火星,而在南半球地壳磁场的作用下,弓形冲击和诱导磁层边界都会远离火星。本研究通过调查 2007 年的风暴,研究火星的大规模大气事件是否在这两个磁场边界上有任何特征。2007 年的全球风暴持续了几个月,大气温度升高,大气中水蒸气和二氧化碳的密度增加,导致大气逃逸增加。我们利用火星快车确定了风暴发生前、发生期间和发生后的边界位置,并将这些位置与火星上的模拟边界位置和地形位置进行了比较。我们发现,虽然目前还不清楚弓形冲击位置是否受到风暴的影响,但尽管火星快车引入了轨道偏差,IMB 的位置确实发生了显著变化。IMB的终结者距离在经度0°-40°和310°-360°处达到峰值,在经度180°附近留下一个凹陷,由于地壳磁场的影响,边界通常延伸到更高的高度。我们认为这可能是由于电离层等离子体在地壳磁场上受到限制,无法与尘埃混合,从而在此处造成电离层压力下降。
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Effects of the 2007 Martian Global Dust Storm on Boundary Positions in the Induced Magnetosphere
Mars's magnetosphere is a sensitive system, varying due to external and internal factors, such as solar wind conditions and crustal magnetic fields. A signature of this influence can be seen in the position of two boundaries; the bow shock and the induced magnetospheric boundary (IMB). The bow shock moves closer to Mars during times of high solar activity, and both the bow shock and IMB bulge away from Mars over crustal magnetic fields in the southern hemisphere. This study investigates whether large-scale atmospheric events at Mars have any signature in these two magnetic boundaries, by investigating the 2007 storm. The 2007 global storm lasted for several months and increased atmospheric temperatures and densities of both water vapor and carbon dioxide in the atmosphere, leading to an increase in atmospheric escape. Using Mars Express, we identified boundary locations before, during, and after the event, and compared these to modeled boundary locations and areographical locations on Mars. We find that, while it is unclear whether the bow shock position is impacted by the storm, the IMB location does change significantly, despite the orbital bias introduced by Mars Express. The terminator distance for the IMB peaks at longitudes 0°–40° and 310°–360°, leaving a depression around 180° longitude, where the boundary usually extends to higher altitudes due to the crustal magnetic fields. We suggest this may be due to the confinement of ionospheric plasma over crustal fields preventing mixing with the dust, creating a dip in ionospheric pressure here.
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来源期刊
The Planetary Science Journal
The Planetary Science Journal Earth and Planetary Sciences-Geophysics
CiteScore
5.20
自引率
0.00%
发文量
249
审稿时长
15 weeks
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