基于GPS观测分析青岛地区电离层板厚变化特性

Variation of ionospheric slab thickness analysis using GPS observations at Qingdao

基于青岛站2000年8月至2006年4月间半个太阳活动周的GPS和测高仪的同步观测,提取期间的电离层TEC和f_oF_2的小时观测数据,联合分析该地区电离层板厚的日变化、季节变化和随太阳活动变化,研究表明青岛地区电离层板厚在日出前时段出现明显的增强峰,并随季节和太阳活动呈现出较复杂的变化关系.利用板厚的相对偏差,探讨了电离层板厚扰动变化分布特征.

The slab thickness is an important ionospheric parameter and is defined as the ratio of the total electron content(TEC)to the F2-layer peak electron density(NmF2).The variation of ionospheric slab thickness is analyzed by using GPS and ionosonde observations from August 2000 to April 2006 at Qingdao(120.3 °E,36.0 °N).An enhanced peak of slab thickness occurs around 04-06 LT in different season and solar activity.The slab thickness changes mainly between 200 and 500 kilometers.The slab thickness is greater for day-time in summer and for night-time in winter.The slab thickness of day-time reduces with the degradation of solar activity at same season,but the one of night-time changes less between high and low solar activities.Moreover,analyzes the distribution of the relative deviation of slab thickness and finds the perturbation of slab thickness happens easier in night-time than daytime.