由上游质子回旋波驱动的火星电离层中的磁子波:MAVEN 和火星快车的两点观测

IF 2.5 2区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
K. Imada , Y. Harada , C.M. Fowler , G. Collinson , J.S. Halekas , S. Ruhunusiri , G.A. DiBraccio , N. Romanelli
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引用次数: 0

摘要

火星大气与挥发物演变(MAVEN)和火星快车(MEX)航天器最近的观测表明,源自上游质子回旋波(PCW)的压力脉冲可以以相同的频率 "环绕 "火星磁层顶,并驱动火星上电离层的磁声波,从而将太阳风的能量输送到电离层。然而,由于单个航天器测量的限制,无法同时观测火星磁层 "环形 "过程的驱动和响应。在这里,我们利用来自 MAVEN 和 MEX 的两点测量来描述上游 PCW 驱动电离层磁场压缩波动的振铃概率。我们开发了一种算法,从两点磁场数据中识别火星上电离层中由 PCW 驱动的磁声波。得出的振铃概率在日侧、强地壳磁场外和高太阳风密度条件下更高。我们还表明,与没有上游 PCW 时的中值功率相比,存在上游 PCW 时相应频率的日侧电离层磁场波动中值功率增强了 ∼ 2 倍。这些结果表明,在 PCW 驱动的磁层环流作用下,太阳风的能量沉积普遍进入了火星日侧电离层。今后的研究,可能通过新的多点观测,应解决波在系统中传播和能量传输的详细过程,以及这一系列过程对电离层中行星离子加热和火星大气损耗的长期影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Magnetosonic waves in the Martian ionosphere driven by upstream proton cyclotron waves: Two-point observations by MAVEN and Mars Express

Recent observations from the Mars Atmosphere and Volatile EvolutioN (MAVEN) and Mars Express (MEX) spacecraft have suggested that pressure pulses originating from upstream proton cyclotron waves (PCWs) can “ring” the Martian magnetopause at the same frequency and drive magnetosonic waves in the upper ionosphere of Mars, thereby transporting energy from the solar wind into the ionosphere. However, the limitation of single-spacecraft measurements prevents simultaneous observations of the driver and response of this “ringing” process of the Martian magnetosphere. Here we utilize two-point measurements from MAVEN and MEX to characterize the ringing probability at which upstream PCWs drive compressional fluctuations in the ionospheric magnetic field. We develop an algorithm to identify PCW-driven magnetosonic waves in the upper ionosphere of Mars from the two-point magnetic field data. The derived ringing probability is higher on the dayside, outside strong crustal magnetic fields, and under high solar wind density conditions. We also show that the median power of dayside ionospheric magnetic field fluctuations is enhanced by a factor of 2 at corresponding frequencies in the presence of upstream PCWs compared to the median power in the absence of upstream PCWs. These results demonstrate the prevalence of energy deposits into the dayside Martian ionosphere from the solar wind mediated by the PCW-driven ringing of the magnetosphere. Future studies, possibly with new multi-point observations, should address the detailed processes of wave propagation and energy transport through the system and the long-term impact of this chain of processes on the planetary ion heating in the ionosphere and atmospheric loss from Mars.

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来源期刊
Icarus
Icarus 地学天文-天文与天体物理
CiteScore
6.30
自引率
18.80%
发文量
356
审稿时长
2-4 weeks
期刊介绍: Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.
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