Spectra of Fluctuations of Solar Wind Plasma Parameters near a Shock Wave

IF 0.6 4区物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS Cosmic Research Pub Date : 2024-03-08 DOI:10.1134/s0010952523700843

O. V. Sapunova, N. L. Borodkova, Yu. I. Yermolaev, G. N. Zastenker

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Abstract

The paper investigates the characteristics of the power spectra of fluctuations in the density of protons and α particles near the front of the interplanetary (IP) and Earth’s bow shock (BS). The frequencies of the power spectra break of fluctuations in the density of protons and α particles were calculated before and behind the ramp of the Earth’s bow shock and interplanetary shock. For the disturbed solar wind beyond the IP ramp, the frequency of the spectrum break of proton fluctuations turned out to be noticeably higher (on average 1.3 Hz) than in the undisturbed region (∼0.8–1.0 Hz), which is explained by an increase in both the velocity and the density of particles. In the case of α particles, the frequency of the spectrum break of fluctuations behind the IP front also increased by almost two times (from 0.7 to 0.12 Hz). It is shown that the average value of the frequency of the proton spectra break behind the ramps is less (0.6 Hz) than in the solar wind (1.0 Hz), due to lower velocity. For α particles, this effect was not statistically detected due to an increase in the density (0.11 Hz for both regions) in the case of BS.

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冲击波附近太阳风等离子体参数的波动光谱

摘要本文研究了行星际（IP）和地球弓形冲击（BS）前沿附近质子和α粒子密度波动的功率谱特征。计算了地球弓形冲击和行星际冲击斜坡前后质子和α粒子密度波动功率谱的频率。对于行星际冲击斜坡后的受扰动太阳风，质子波动的频谱断裂频率（平均 1.3 Hz）明显高于未受扰动区域（∼0.8-1.0 Hz），这可以用粒子速度和密度的增加来解释。在 α 粒子的情况下，IP 前沿后方波动的频谱断裂频率也增加了近两倍（从 0.7 Hz 到 0.12 Hz）。结果表明，由于速度较低，斜面后方质子频谱断裂的平均频率值（0.6 Hz）比太阳风中的（1.0 Hz）要低。对于 α 粒子，由于 BS 的密度增加（两个区域均为 0.11 Hz），在统计上没有发现这种影响。

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来源期刊

Cosmic Research 地学天文-工程：宇航

CiteScore

1.10

自引率

33.30%

发文量

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.