Analysis Of Energy Coupling Effect Between Solar Wind And Geomagnetic Field In Local Area

The interplanetary space in which the solar wind is the main material is the main space factors that controlling and affecting the external shape and internal physical processes of the Earth's magnetosphere.At present,we have preliminarily known some characteristics of the solar wind by satellite observation.And find out the the dynamics of the interaction between the solar wind and the earth's magnetosphere by calculate the spatial equivalent current and observe the Earth's magnetic field.In order to estimate the energy input the magnetosphere by the solar wind more effectively,various types of solar wind and magnetosphere energy coupling function have been developed to provide a quantitative for space weather prediction.This paper focuses on function Ein,one of the existing energy coupling mode which calculate energy input magnetosphere about solar wind,the main content and result of this paper is:1.Analyse the coupling relations of inject energy with solar wind and components of the geomagnetic field and different geomagnetic indices during storm by satellite and ground-based magnetometer.2.Because the observed data of magnetic are non-stationary and non-linear,and there has a time delay between the solar wind data measured by satellite and the magnetic data measured by ground-based magnetometer,this paper considers use Ensemble Empirical Mode Decomposition(EEMD)and Time-Delay Mutual Information(TDMI)to process and analyze related data.EEMD improves the correlation coefficients between geomagnetic data and energy inject by solar wind around different regions,especially in low latitudes regions,but the effect of EEMD in the mid-high latitudes is weak;The correlation coefficients improved greatly after reconstructing time series by TDMI.3.Analysis the energy coupling effects of local solar wind-geomagnetic filed by different types of strom event,different regions and different geomagnetic components.The following results are obtained:In total,the coupling efficiency of solar wind and geomagnetic energy in coronal mass ejection(CME)type magnetic storm events is higher than that in corotating interaction region(CIR)type events.EEMD and TDMI have the same effect in two different type of storms caused by CME and CIR.The coupling coefficients of geomagnetic horizontal component H and energy inject by solar wind shows a tendency of the auroral zone and the low latitude area near the equator to be high and the mid-latitude zone to be low.The coupling coefficients of geomagnetic eastward component D and energy inject by solar wind increases with the increase of latitude,and the space distribution in the low latitude region is uneven,but in the high latitude area it's around 0.5.The coupling coefficients of geomagnetic vertical component Z and energy inject by solar wind is characterized by low in low latitude region and auroral zone,but high in mid-high latitude.It is also found in this paper,be compared with local geomagnetic field components,the coupling between energy inject by solar wind with AE,ASY,SYM and other geomagnetic indices is better,and TDMI is also effectivity in geomagnetic indices.And no matter in CME type or CIR type storm,the coupling between solar wind plasma parameters,interplanetary magnetic fields with geomagnetic indices,the most significant coupling is the interplanetary magnetic field north-south component Bz and the electric field Ec which calculated from the magnetic field and the solar wind velocity Vf.The research contents and results in this paper are based on the strong magnetic storm events for the solar cycle 24.Analysis the the energy coupling effect of the local solar wind-geomagnetic from the local observation parameters of the solar wind,the energy input function of the solar wind,the geomagnetic component of different regions and the global integrated geomagnetic index.The objective law reflected by the analysis results can play a reference role in the establishment spatial weather forecasting model.