电离层测高数据对太阳耀斑响应的研究

The Study of Solar Flares Effect on Ionosonde Data

利用子午工程布设在武汉、海南站电离层测高仪2011年1月至2013年8月的电离图图形和SAO数据,分析M5.0级以上太阳耀斑对电离层的影响。结果表明:(1)2011年2月15日X2.2级耀斑爆发后,武汉、海南站电离层测高仪电离图图形均出现电离图描迹消失现象;电离层测高仪起测频率fmin在耀斑爆发期间比平静日同时段高。(2)除了耀斑的X射线最大辐射通量,耀斑持续时间也是影响电子浓度增量大小的一个重要参数,一个X射线最大辐射通量较小但其持续时间较长的耀斑对电离层的影响可能会强烈于X射线最大辐射通量较大但其持续时间较短的耀斑。(3)电子浓度增量的大小与耀斑爆发地方时有直接关系,中午时段比晚间更大。

This paper analyzes the influence of solar flares over M5.0 on ionosphere using ionospher data observed from January,2011 to August,2013 at Wuhan and Hainan station founded by Meridian Space Weather Monitoring Project.The results show that：（1） The ionograms＇ trace of Wuhan and Hainan station disappeared after the erupting of solar flare of class X2.2 on February 15th,2011 ; Morever,there is a minimum frequency gap between a solar flare＇day and a quiet day,with the former higher than the latter.（2）The class and durations of solar flare are all the main factors which have a positive effect on ionospheric electron density.It indicates that a small flare that has a long time maybe has an stronger effect on ionosphere than a big flare that has an short duration.（3） The local time of flare can also affects the increment of ionospheric electron density; the results show that a flare that occurs at noon time has a stronger effect on ionosphere.