太阳耀斑对电离层总电子含量的影响

本文分析了1978—1979年1级以上的太阳耀斑对电离层总电子含量的影响. 给出了不同持续时间、不同亮度、不同季节、发生在日面不同位置上的太阳耀斑对电离层总电子含量的影响.分析结果表明,持续时间大于等于1.5小时的耀斑对电子含量有明显的扰动,耀斑出现后电子含量随之增加,在第4—5天增加到最大值,扰动持续数日;持续时间小于1.5小时的耀斑对电子含量影响甚微;非亮耀斑对电子含量的扰动小于亮耀斑;夏季出现的耀斑对电子含量无明显扰动,只有冬季出现的亮耀斑对电子含量有明显的扰动;太阳耀斑扰动电子含量有明显的日面位置东西不对称性,只有出现在日面东边、特别是E₃区的太阳耀斑对电子含量才有明显的扰动. 

The Influences of Solar Flares on Ionospheric Electron Content

This paper provides a statistical study of the disturbance of ionospheric electron content initiated by solar flares over importance one for 1978-1979. It shows the different effects of solar flares grouped by their importance, duration, season and the distance from the solar central meridian. The results show that ionospheric electron content is obviously disturbed by the bright solar flares with duration longer than 1.5 hours. The electron content starts to increase after the occurrence of solar flares and reached its maximum on the fourth-fifth day. The electron content disturbances caused by non-bright flares is smaller than by bright filares. Solar flares with duration <1.5 hours do not disturb the electron content. The flares occurred in the summer seems not to disturb the electron content. Only the flares occurred in the winter obviously disturb the electron content. There is an east-west asymmetry in distribution of flare’s position in causing the electron conten distinct disturbances. Flares occurred on the east 61-90E from the solar central meridian and in winter seasons induce the largest disturbances for the electron content.