{"title":"强地磁风暴恢复的动力学和太阳风控制","authors":"O. Ahmed, B. Badruddin, M. Derouich","doi":"10.1007/s10509-024-04325-3","DOIUrl":null,"url":null,"abstract":"<div><p>In this work we have studied about the characteristics and dynamical changes during the recovery time of moderate and strong geomagnetic storms of (<span>\\(\\mathrm{Dst}<-50\\text{ nT}\\)</span>). 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 (<span>\\(\\rho ^{\\frac{1}{2}}\\mathrm{Ey}\\)</span>) which best described the decay rate of the ring current. It shows that electric field term (Ey) coupled with a viscus term (<span>\\(\\rho ^{\\frac{1}{2}}\\)</span>) 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 (<span>\\(\\rho ^{\\frac{1}{2}}\\)</span>) and the electric field-related function (<span>\\(\\mathrm{v}^{\\frac{4}{3}}\\mathrm{B}\\)</span>) (<span>\\(\\rho ^{\\frac{1}{2}}\\mathrm{v}^{\\frac{4}{3}}\\mathrm{B}\\)</span>), 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.</p></div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":null,"pages":null},"PeriodicalIF":1.8000,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Dynamics and solar wind control of the recovery of strong geomagnetic storms\",\"authors\":\"O. Ahmed, B. Badruddin, M. Derouich\",\"doi\":\"10.1007/s10509-024-04325-3\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In this work we have studied about the characteristics and dynamical changes during the recovery time of moderate and strong geomagnetic storms of (<span>\\\\(\\\\mathrm{Dst}<-50\\\\text{ nT}\\\\)</span>). 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 (<span>\\\\(\\\\rho ^{\\\\frac{1}{2}}\\\\mathrm{Ey}\\\\)</span>) which best described the decay rate of the ring current. It shows that electric field term (Ey) coupled with a viscus term (<span>\\\\(\\\\rho ^{\\\\frac{1}{2}}\\\\)</span>) 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 (<span>\\\\(\\\\rho ^{\\\\frac{1}{2}}\\\\)</span>) and the electric field-related function (<span>\\\\(\\\\mathrm{v}^{\\\\frac{4}{3}}\\\\mathrm{B}\\\\)</span>) (<span>\\\\(\\\\rho ^{\\\\frac{1}{2}}\\\\mathrm{v}^{\\\\frac{4}{3}}\\\\mathrm{B}\\\\)</span>), 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.</p></div>\",\"PeriodicalId\":8644,\"journal\":{\"name\":\"Astrophysics and Space Science\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.8000,\"publicationDate\":\"2024-07-02\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Astrophysics and Space Science\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s10509-024-04325-3\",\"RegionNum\":4,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ASTRONOMY & ASTROPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Astrophysics and Space Science","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/s10509-024-04325-3","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
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.
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.