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

被引：1

作者：

Nykyri, K. ^{[1
]}

Di Matteo, S. ^{[1
,2
]}

Archer, M. O. ^{[3
]}

Ma, X. ^{[4
]}

Hartinger, M. D. ^{[5
,6
]}

Sarantos, M. ^{[1
]}

Zesta, E. ^{[1
]}

Paterson, W. R. ^{[1
]}

机构：

[1] NASA Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[2] Catholic Univ Amer, Washington, DC USA

[3] Imperial Coll London, Dept Phys, London, England

[4] Embry Riddle Aeronaut Univ, Ctr Space & Atmospher Res, Daytona Beach, FL USA

[5] Space Sci Inst, Boulder, CO USA

[6] Univ Calif Los Angeles, Los Angeles, CA USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2024年 / 51卷 / 22期

基金：

美国国家航空航天局; 英国工程与自然科学研究理事会;

关键词：

ULF waves; lunar wake; plasma sheet; field line resonances; Moon; magnetotail; FIELD LINE RESONANCES; PLASMA INSTRUMENT; MODES; EXCITATION; WAVES;

D O I：

10.1029/2024GL110129

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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 approximate to ${\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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