Ponderomotive Disturbance of the Solar Wind Velocity before the Fronts of Shock Waves

IF 0.8 4区 物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS
A. V. Guglielmi, A. S. Potapov, F. Z. Feygin
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引用次数: 0

Abstract

The solar wind speed perturbation before the fronts of shock waves is theoretically investigated. It is shown that there is a small, but quite detectable deceleration in front of the Earth’s bow shock in the Earth-bound frame of reference. The perturbation is caused by the ponderomotive Abraham force. The Abraham force results from the excitation of fast magnetosonic waves in the foreshock region. The theoretical estimate of the solar wind deceleration by ~10 km/s agrees with measurements of the directional plasma flow velocity on the spacecraft in the foreshock region of the Earth’s bow shock. The use of the velocity addition theorem for interplanetary foreshocks with a structure similar to Earth’s foreshock allows to predict acceleration rather than deceleration of the solar wind in front of interplanetary shocks in the Earth-bound reference frame. The main conclusion is that the theory of ponderomotive plasma modification is of undoubted interest for the interpretation of in situ measurements in the interplanetary environment.

激波锋面前太阳风速度的重力动力扰动
对激波锋面前的太阳风速度扰动进行了理论研究。结果表明,在地球的参考系中,在地球的弓形激波前面有一个小的,但相当可探测到的减速。扰动是由有源亚伯拉罕力引起的。亚伯拉罕力是由前震区快速磁声波的激发产生的。对太阳风减速约10 km/s的理论估计与地球弓形激波前激波区航天器上定向等离子体流速度的测量结果一致。将速度加法定理用于与地球前震结构相似的行星际前震,可以在地球参考系中预测太阳风在行星际前震前的加速而不是减速。主要结论是,质动力等离子体修饰理论对于解释行星际环境中的原位测量无疑是有意义的。
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来源期刊
Solar System Research
Solar System Research 地学天文-天文与天体物理
CiteScore
1.60
自引率
33.30%
发文量
32
审稿时长
6-12 weeks
期刊介绍: Solar System Research publishes articles concerning the bodies of the Solar System, i.e., planets and their satellites, asteroids, comets, meteoric substances, and cosmic dust. The articles consider physics, dynamics and composition of these bodies, and techniques of their exploration. The journal addresses the problems of comparative planetology, physics of the planetary atmospheres and interiors, cosmochemistry, as well as planetary plasma environment and heliosphere, specifically those related to solar-planetary interactions. Attention is paid to studies of exoplanets and complex problems of the origin and evolution of planetary systems including the solar system, based on the results of astronomical observations, laboratory studies of meteorites, relevant theoretical approaches and mathematical modeling. Alongside with the original results of experimental and theoretical studies, the journal publishes scientific reviews in the field of planetary exploration, and notes on observational results.
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