强地磁风暴恢复的动力学和太阳风控制

IF 1.8 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
O. Ahmed, B. Badruddin, M. Derouich
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引用次数: 0

摘要

在这项工作中,我们研究了(\(\mathrm{Dst}<-50\text{ nT}\))中度和强地磁风暴恢复期间的特征和动力学变化。在对 57 个由 CMEs/CIRs 引发的风暴的研究中,我们主要关注太阳风对其衰减阶段的影响。我们根据所选风暴的恢复特征将其分为不同的组别。利用叠加历元分析和最佳拟合方法,我们仔细研究了若干行星际太阳风等离子体和场参数及其各种函数。分析包括各种单一、双重和多重行星际等离子体和场参数/函数。我们通过仔细拟合指数曲线,确定了风暴恢复曲线最具代表性的特征时间。通过对Dst和太阳风参数/函数之间的相关性分析,我们分离出了一个耦合函数(\(\rho ^{\frac{1}{2}}\mathrm{Ey}\)),它能最好地描述环流的衰减率。这表明电场项(Ey)与粘性项(\(\rho ^{/frac{1}{2}}\))在决定地磁暴恢复率方面起着关键作用。此外,我们用二阶多项式模拟了Dst恢复与太阳风参数和函数的复杂关系。值得注意的是,在恢复阶段,Dst 与太阳风参数/函数之间存在动态相关性。三参数太阳风-磁层电动力学耦合函数、它结合了粘性项(\(\rho ^{\frac{1}{2}}\)和电场相关函数(\(\mathrm{v}^{\frac{4}{3}}\mathrm{B}})(\(\rho ^{\frac{1}{2}}\mathrm{v}^{\frac{4}{3}}\mathrm{B}})、对地磁扰动的恢复阶段有重大影响。我们的研究扩展到了主要阶段和恢复阶段持续时间之间的关系,为了解太阳风对地磁扰动衰减的复杂控制提供了宝贵的见解。这些发现极大地促进了我们对太阳风动力学与地磁扰动演变之间复杂关系的理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Dynamics and solar wind control of the recovery of strong geomagnetic storms

Dynamics and solar wind control of the recovery of strong geomagnetic storms

In this work we have studied about the characteristics and dynamical changes during the recovery time of moderate and strong geomagnetic storms of (\(\mathrm{Dst}<-50\text{ nT}\)). In our investigation of 57 storms triggered by CMEs/CIRs, we concentrated on the solar wind’s influence on their decay phases. Selected storms were classified into distinct groups based on their recovery characteristics. Employing the superposed epoch analysis and best fit methods, we scrutinized several interplanetary solar wind plasma and field parameters and their various functions. The analysis encompassed various single, dual, and multiple interplanetary plasma and field parameters/functions. We determined the most representative characteristic time for the storm’s recovery profile by carefully fitting an exponential curve. A correlation analysis between Dst and solar wind parameters/functions led us to isolate a coupling function (\(\rho ^{\frac{1}{2}}\mathrm{Ey}\)) which best described the decay rate of the ring current. It shows that electric field term (Ey) coupled with a viscus term (\(\rho ^{\frac{1}{2}}\)) plays pivotal role in determining the recovery rate of a geomagnetic storms. Additionally, we modeled the complex patterns of Dst recovery in relation to solar wind parameters and functions using a second-order polynomial. Remarkably, during the recovery phase, a dynamic correlation between Dst and solar wind parameters/functions was revealed. The three-parameter solar wind-magnetosphere electrodynamical coupling functions, which combines the viscus term (\(\rho ^{\frac{1}{2}}\)) and the electric field-related function (\(\mathrm{v}^{\frac{4}{3}}\mathrm{B}\)) (\(\rho ^{\frac{1}{2}}\mathrm{v}^{\frac{4}{3}}\mathrm{B}\)), significantly impacts the recovery phase of geomagnetic disturbances. Our investigation extended to the relationship between main and recovery phase durations, providing valuable insights into the solar wind’s intricate control over the decay of the geomagnetic disturbances. These findings contribute significantly to advancing our comprehension of the complex relationship between solar wind dynamics and the evolution of geomagnetic disturbances.

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来源期刊
Astrophysics and Space Science
Astrophysics and Space Science 地学天文-天文与天体物理
CiteScore
3.40
自引率
5.30%
发文量
106
审稿时长
2-4 weeks
期刊介绍: Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered. The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing. Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.
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