Could a Low-Frequency Perturbation in the Earth's Magnetotail Be Generated by the Lunar Wake?

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Geophysical Research Letters Pub Date : 2024-11-25 DOI:10.1029/2024GL110129

K. Nykyri, S. Di Matteo, M. O. Archer, X. Ma, M. D. Hartinger, M. Sarantos, E. Zesta, W. R. Paterson

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Abstract

Both ground based magnetometers and ionospheric radars at Earth have frequently detected Ultra Low Frequency (ULF) fluctuations at discrete frequencies extending below one mHz-range. Many dayside solar wind drivers have been convincingly demonstrated as driver mechanisms. In this paper we investigate and propose an additional, nightside generation mechanism of a low frequency magnetic field fluctuation. We propose that the Moon may excite a magnetic field perturbation of the order of 1 nT at discrete frequencies when it travels through the Earth's magnetotail $\approx$ 4–5 days every month. Our theoretical prediction is supported by a case study of ARTEMIS magnetic field measurements at the lunar orbit in the Earth's magnetotail. ARTEMIS detects statistically significant peaks in magnetic field fluctuation power at frequencies of 0.37–0.47 mHz that are not present in the solar wind.

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地球磁尾的低频扰动可能是由月球唤醒产生的吗？

地球上的地基磁强计和电离层雷达都经常探测到频率低于 1 mHz 范围的超低频波动。许多日侧太阳风驱动因素已被证明是令人信服的驱动机制。在本文中，我们研究并提出了另外一种低频磁场波动的夜间产生机制。我们提出，月球每月穿过地球磁尾 ≈${approx} $4-5 天时，可能会以离散频率激发 1 nT 量级的磁场扰动。我们的理论预测得到了 ARTEMIS 在地球磁尾的月球轨道磁场测量案例研究的支持。ARTEMIS探测到频率为0.37-0.47 mHz的磁场波动功率峰值，这在统计学上是显著的，而在太阳风中是不存在的。

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.