Interest in better understanding the socioeconomic impacts of space weather is growing with advances in modern technology systems in space and the associated space economy.The socioeconomic impacts of natural hazards,...Interest in better understanding the socioeconomic impacts of space weather is growing with advances in modern technology systems in space and the associated space economy.The socioeconomic impacts of natural hazards,such as hurricanes and earthquakes,have been widely studied scientifically[1].The effects of space weather on human society and the macroeconomy is an emerging area of research,as reported by the UN Committee on the Peaceful Users of Outer Space(UN COPUOS)[2]and the US National Research Council[3].展开更多
The third order accurate upwind compact difference scheme has been applied to the numerical study of the magnetic reconnection process possibly occurring near the interplanetary current sheet, under the framework of t...The third order accurate upwind compact difference scheme has been applied to the numerical study of the magnetic reconnection process possibly occurring near the interplanetary current sheet, under the framework of the two-dimensional compressible magnetohydrodynamics (MHD). Our results here show that the driven reconnection near the current sheet can occur within 10-30 min for the interplanetary high magnetic Reynolds number, RM =2 000-10 000, the stable magnetic reconnection structure can be formed in hour-order of magnitude, and there are some basic properties such as the multiple X-line reconnections, vortical velocity structures, filament current systems, splitting and collapse of the high-density plasma bulk. These results are helpful in understanding and identifying the magnetic reconnection phenomena near the interplanetary current sheets.展开更多
In this paper,we construct a two-dimensional third-order space-time conservation element and solution element(CESE)method and apply it to the magnetohydrodynamics(MHD)equations.This third-order CESE method preserves a...In this paper,we construct a two-dimensional third-order space-time conservation element and solution element(CESE)method and apply it to the magnetohydrodynamics(MHD)equations.This third-order CESE method preserves all the favorable attributes of the original second-order CESEmethod,such as:(i)flux conservation in space and time without using an approximated Riemann solver,(ii)genuine multi-dimensional algorithm without dimensional splitting,(iii)the use of the most compact mesh stencil,involving only the immediate neighboring cells surrounding the cell where the solution at a new time step is sought,and(iv)an explicit,unified space-time integration procedure without using a quadrature integration procedure.In order to verify the accuracy and efficiency of the scheme,several 2D MHD test problems are presented.The result of MHD smooth wave problem shows third-order convergence of the scheme.The results of the other MHD test problems show that the method can enhance the solution quality by comparing with the original second-order CESE scheme.展开更多
Magnetic fields play a fundamental role in the structure and dynamics of the solar corona.As they are driven by their footpoint motions on the solar surface,which transport energy from the interior of the Sun into its...Magnetic fields play a fundamental role in the structure and dynamics of the solar corona.As they are driven by their footpoint motions on the solar surface,which transport energy from the interior of the Sun into its atmosphere,the coronal magnetic fields are stressed continuously with buildup of magnetic nonpotentiality in the form of topology complexity(magnetic helicity)and local electric currents(magnetic free energy).The accumulated nonpotentiality is often released explosively by solar eruptions,manifested as solar flares and coronal mass ejections.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.12173012,12473050)the Guangdong Natural Science Funds for Distinguished Young Scholars(Grant No.2023B1515020049)the Shenzhen Science and Technology Project(Grant No.JCYJ20240813104805008)。
文摘Interest in better understanding the socioeconomic impacts of space weather is growing with advances in modern technology systems in space and the associated space economy.The socioeconomic impacts of natural hazards,such as hurricanes and earthquakes,have been widely studied scientifically[1].The effects of space weather on human society and the macroeconomy is an emerging area of research,as reported by the UN Committee on the Peaceful Users of Outer Space(UN COPUOS)[2]and the US National Research Council[3].
基金the National Natural Foundation of China (Grant Nos. 49674243 and 49874040).
文摘The third order accurate upwind compact difference scheme has been applied to the numerical study of the magnetic reconnection process possibly occurring near the interplanetary current sheet, under the framework of the two-dimensional compressible magnetohydrodynamics (MHD). Our results here show that the driven reconnection near the current sheet can occur within 10-30 min for the interplanetary high magnetic Reynolds number, RM =2 000-10 000, the stable magnetic reconnection structure can be formed in hour-order of magnitude, and there are some basic properties such as the multiple X-line reconnections, vortical velocity structures, filament current systems, splitting and collapse of the high-density plasma bulk. These results are helpful in understanding and identifying the magnetic reconnection phenomena near the interplanetary current sheets.
基金supported by the National Natural Science Foundation of China(Grant Nos.42030204,41874202)Shenzhen Natural Science Fund(the Stable Support Plan Program GXWD20220817152453003)+1 种基金Shenzhen Key Laboratory Launching Project(No.ZDSYS20210702140800001)the Specialized Research Fund for State Key Laboratories.
文摘In this paper,we construct a two-dimensional third-order space-time conservation element and solution element(CESE)method and apply it to the magnetohydrodynamics(MHD)equations.This third-order CESE method preserves all the favorable attributes of the original second-order CESEmethod,such as:(i)flux conservation in space and time without using an approximated Riemann solver,(ii)genuine multi-dimensional algorithm without dimensional splitting,(iii)the use of the most compact mesh stencil,involving only the immediate neighboring cells surrounding the cell where the solution at a new time step is sought,and(iv)an explicit,unified space-time integration procedure without using a quadrature integration procedure.In order to verify the accuracy and efficiency of the scheme,several 2D MHD test problems are presented.The result of MHD smooth wave problem shows third-order convergence of the scheme.The results of the other MHD test problems show that the method can enhance the solution quality by comparing with the original second-order CESE scheme.
基金Thiswork is jointly supported by the National Natural Science Foundation of China(NSFC 42174200,41822404,and 41731067)the Fundamental Research Funds for the Central Universities(HIT.OCEF.2021033)+1 种基金the Shenzhen Science and Technology Program(RCJC20210609104422048 and JCYJ20190806142609035)Y.G.is supported by NSFC(11773016 and 11961131002)and 2020YFC2201201.We thank Dr.Aiying Duan for a careful reading of themanuscript.We are very grateful to the six reviewers for helpful comments and suggestions,which improved our manuscript.
文摘Magnetic fields play a fundamental role in the structure and dynamics of the solar corona.As they are driven by their footpoint motions on the solar surface,which transport energy from the interior of the Sun into its atmosphere,the coronal magnetic fields are stressed continuously with buildup of magnetic nonpotentiality in the form of topology complexity(magnetic helicity)and local electric currents(magnetic free energy).The accumulated nonpotentiality is often released explosively by solar eruptions,manifested as solar flares and coronal mass ejections.
