Geomagnetic Effects Of Solar Wind And The Impact Of High Energy Electron Intensity Of The Geosynchronous Orbit

The interaction between the solar wind and the magnetosphere not only will lead to the disturbance in the geomagnetic field but also will lead to the variation in the electron environment. The solar wind can only interact with the magnetosphere when it reaches the magnetosphere. This indicates that the geoefffectiveness of solar wind at L1 point has some time delay. The delay time depends on the solar wind speed.Using high time resolution solar wind data and geomagnetic data and considering the delay effect of the geoeffectiveness of solar wind at L1 point, we not only precisely analyze the interplanetary sources for the main phases of several geomagnetic storms but also we find that the product of solar wind and the south component of interplanetary magnetic field are the key factor controlling the development of the main phase of a geomagnetic storm.The interaction between the solar wind and the magnetosphere can also influence the electron flux at geosynchronous orbit. The analysis of the electron integral flux greater than 2 MeV with extreme high level (109 Electrons/cm2-day-sr)and the associated solar wind parameters, geomagnetic storms and substorms'information shows that the solar wind density was the most important parameter in the solar wind various parameters affecting the 2 MeV electron flux at geostationary orbit. Low solar wind density and the strong substorm are the two key parameters leading to the 2 MeV electron flux at geostationary orbit reach very high level during the geomagnetic storm recovery phase. Most extreme high level of electron flux at geostationary orbit occurred during the geomagnetic storm recovery phase with the solar wind proton density lower than 4 cm-3 and strong substorm activity. When solar wind density was low and AE index greater than 200 nT, the 2 MeV electron flux at geostationary orbit will increase sustained. The 2 MeV electron flux at geostationary orbit will cease to increase when AE index decreased to 200 nT or lower value. The extreme high level of 2 MeV electron flux at geostationary orbit occurred during 1996-1998 and 2003-2008 with most of them occurred during the spring and autumn.Using SYM-H index, we studied the time characteristic of all the intense geomagnetic storms occurred in the solar cycle 23 and the properties of 2 MeV electron flux at geosynchronous orbit electron flux under undisturbed state.