磁暴期间中纬度电离层剖面结构变化的数值模拟

利用电离层理论模型模拟了磁暴期间热层大气温度、成分、中性风和电场扰动对电离层电子密度剖面结构，特别是峰值密度和峰值高度变化的影响，结果表明，热层大气温度变化所引起光化反应系数的改变对电离层剖面结构影响不大；热层大气成分特别是Ｎ２／Ｏ的变化能有效地引起密度剖面变化，Ｎ２增加足以使峰值密度产生所观测到的负相暴；由中性风和电场引起等离子体漂移是峰值高度ｈｍＦ２变化的主要原因，但对电子密度的影响不足以抵消

MODEL STUDY OF MID-LATITUDE IONOSPHERIC DENSITY PROFILE VARIATION DURING GEOMAGNETIC STORMS

A theoretical ionospheric model is developed in order to study the variation of ionospheric density profile during geomagnetic storms, considering the disturbances of thermospheric temperature, composition, wind and electric field. The results show that the increase of N2/O is the most efficient way to decrease the electron density as well as the peak density NmF2, but the up and down movement of peak height (hmF2) is mainly caused by neutral wind or electric field disturbance. The temperature change has little effect on the profile variation. It is possible to distinguish these different physical processes using f0F2 and hmF2 parameters in practical measurement.