Observations and Analysis of the Mid-Latitude Atmospheric Electric Field During Geomagnetic Activity

摘要

In this study, the diurnal and seasonal variation curves of atmospheric electric field are obtained, based on the extensive observations at Mohe station (Geographical coordinates: 22.357°E, 53.482°N and geomagnetic coordinates: 195.5°E, 48.8°N) of the Chinese Meridian Project. The results show that the diurnal variation of conforms to the “Carnegie” pattern, and the value of E_z in winter is higher than the summer. The coupling effect of the solar wind–magnetosphere with the atmospheric electric field is established. In total, 15 cases of magnetic storms are selected while Mohe is under fair weather condition throughout the storm period. The analyzed results reveal that E_z exhibits the same characteristics during the 15 storms, that is, E_z decreases sharply and changes simultaneously with the interplanetary magnetic field (IMF) component and solar wind proton number density. When the IMF–B_z shifts to south, E_z presents a large decrease with magnitudes of about 100 V/m–600 V/m.