Geomagnetic storm events have a strong influence on the ionosphere–thermosphere(I-T)coupling system.Analyzing the regional response process of the I-T system and its differences across the northern and southern hemis...Geomagnetic storm events have a strong influence on the ionosphere–thermosphere(I-T)coupling system.Analyzing the regional response process of the I-T system and its differences across the northern and southern hemispheres is an important but challenging task.In this study,we used a combination of multiple observations and a model simulation to examine the north–south hemispheric difference in the I-T coupling system in the American and Asian sectors during the geomagnetic superstorm that occurred in May 2024.Observations of the total electron content(TEC)showed that the Asian sector had negative storms in the northern hemisphere and positive storms in the southern hemisphere,a process that exacerbated the hemispheric differences in the TEC.However,both hemispheres of the American sector showed negative storms.The thermospheric composition changes also differed between the two sectors,and their variation could partially explain the hemispheric differences caused by positive and negative storms.Moreover,the influence of the thermospheric density change was less than that of the thermospheric composition.Finally,the dynamic effect of the thermospheric wind and the plasma transport processes strongly modulated the north–south differences in the TEC at nighttime in the American and Asian sectors,respectively,during this superstorm.展开更多
In this paper is given short description of the magnetogram inversion technique,MIT2,and of methods of calculation of some parameters of space weather.Are given also examples of new results,obtained using the MIT2 and...In this paper is given short description of the magnetogram inversion technique,MIT2,and of methods of calculation of some parameters of space weather.Are given also examples of new results,obtained using the MIT2 and solar wind data.展开更多
在这篇案例展示(showcase)论文中,作者提供了伊恩·麦克哈格(Ian McHarg)久负盛名并且卓有成效的三个社会-生态实践研究典型案例。每个案例都由极富见地的思想所支撑,这些思想都是由麦克哈格在实践中发现并且为阐明实践而形成的,它...在这篇案例展示(showcase)论文中,作者提供了伊恩·麦克哈格(Ian McHarg)久负盛名并且卓有成效的三个社会-生态实践研究典型案例。每个案例都由极富见地的思想所支撑,这些思想都是由麦克哈格在实践中发现并且为阐明实践而形成的,它们分别是"绿色地球(to green the earth)"思想"、不适宜城市化(unsuitability for urbanization)"思想以及构建生态韧性的"自然简朴原则(a profoundly simple concept)"思想。这些案例一起为"麦克哈格是对的(McHarg had it right)"这句话提供了令人信服的证明。展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos. 42030202, 42241115, and 42174204)the China Postdoctoral Science Foundation (Grant No. 2023M743467)+2 种基金the Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No. Y202021)the National Key R&D Program of China (Grant No. 2022YFF0504400)the Opening Funding of the Chinese Academy of Sciences dedicated to the Chinese Meridian Project
文摘Geomagnetic storm events have a strong influence on the ionosphere–thermosphere(I-T)coupling system.Analyzing the regional response process of the I-T system and its differences across the northern and southern hemispheres is an important but challenging task.In this study,we used a combination of multiple observations and a model simulation to examine the north–south hemispheric difference in the I-T coupling system in the American and Asian sectors during the geomagnetic superstorm that occurred in May 2024.Observations of the total electron content(TEC)showed that the Asian sector had negative storms in the northern hemisphere and positive storms in the southern hemisphere,a process that exacerbated the hemispheric differences in the TEC.However,both hemispheres of the American sector showed negative storms.The thermospheric composition changes also differed between the two sectors,and their variation could partially explain the hemispheric differences caused by positive and negative storms.Moreover,the influence of the thermospheric density change was less than that of the thermospheric composition.Finally,the dynamic effect of the thermospheric wind and the plasma transport processes strongly modulated the north–south differences in the TEC at nighttime in the American and Asian sectors,respectively,during this superstorm.
基金Supported by RFBR(No.02-05-64519)RFBR-DFG(No.02-05-04002)+1 种基金INTAS(No.01-0142)the China-Russia Joint Research Center on Space WeatherChinese Academy of Sciences
文摘In this paper is given short description of the magnetogram inversion technique,MIT2,and of methods of calculation of some parameters of space weather.Are given also examples of new results,obtained using the MIT2 and solar wind data.
文摘在这篇案例展示(showcase)论文中,作者提供了伊恩·麦克哈格(Ian McHarg)久负盛名并且卓有成效的三个社会-生态实践研究典型案例。每个案例都由极富见地的思想所支撑,这些思想都是由麦克哈格在实践中发现并且为阐明实践而形成的,它们分别是"绿色地球(to green the earth)"思想"、不适宜城市化(unsuitability for urbanization)"思想以及构建生态韧性的"自然简朴原则(a profoundly simple concept)"思想。这些案例一起为"麦克哈格是对的(McHarg had it right)"这句话提供了令人信服的证明。
