Geomagnetic Pulsations in the 1–4 mHz Frequency Range (Pc5/Pi3) in the Magnetotail. Internal and Extramagnetospheric Sources

IF 0.6 4区 物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS Cosmic Research Pub Date : 2024-06-17 DOI:10.1134/s0010952524600355
N. V. Yagova, N. S. Evsina
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Abstract

Spectral and spatial parameters of nonstorm Pc5/Pi3 geomagnetic pulsations in the geomagnetic tail are studied based on magnetic measurements on Cluster satellites under different conditions in the interplanetary medium. Both the average values of the magnetic field components in front of the bow shock and fluctuations in the pulsations’ frequency range are considered. Special attention is paid to the conditions of small amplitudes of fluctuations (“zero” perturbation) in order to localize the source of pulsations starting under these conditions. For this purpose, simultaneous data from two satellites located on one or different sides of the magnetopause are used. It is shown that, along with a decrease in the amplitude of fluctuations in front of the bow shock, the amplitude and spatial scale of fluctuations in the magnetosheath change and the coherence between fluctuations on different sides of the magnetopause decreases sharply. This allows us to conclude that the pulsations occurring in the geomagnetic tail under “zero” level fluctuations in front of the bow shock are an intramagnetospheric phenomenon weakly related to the processes beyond the magnetopause.

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磁尾 1-4 mHz 频率范围 (Pc5/Pi3) 内的地磁脉冲。磁层内部和外部来源
摘要 根据星簇卫星在行星际介质中不同条件下的磁测量结果,研究了地磁尾部非风暴 Pc5/Pi3 地磁脉动的光谱和空间参数。既考虑了弓形冲击前磁场分量的平均值,也考虑了脉动频率范围内的波动。特别关注了小振幅波动("零 "扰动)的条件,以便定位在这些条件下开始的脉冲源。为此,使用了位于磁层顶一侧或不同侧的两颗卫星的同步数据。结果表明,随着弓形冲击前波动振幅的减小,磁鞘中波动的振幅和空间尺度也发生了变化,磁极线不同侧波动之间的一致性急剧下降。由此我们可以得出结论,在弓形冲击前的 "零 "级波动下,地磁尾部出现的脉动是一种磁层内现象,与磁极面以外的过程关系不大。
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来源期刊
Cosmic Research
Cosmic Research 地学天文-工程:宇航
CiteScore
1.10
自引率
33.30%
发文量
41
审稿时长
6-12 weeks
期刊介绍: Cosmic Research publishes scientific papers covering all subjects of space science and technology, including the following: ballistics, flight dynamics of the Earth’s artificial satellites and automatic interplanetary stations; problems of transatmospheric descent; design and structure of spacecraft and scientific research instrumentation; life support systems and radiation safety of manned spacecrafts; exploration of the Earth from Space; exploration of near space; exploration of the Sun, planets, secondary planets, and interplanetary medium; exploration of stars, nebulae, interstellar medium, galaxies, and quasars from spacecraft; and various astrophysical problems related to space exploration. A chronicle of scientific events and other notices concerning the main topics of the journal are also presented.
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