RELATIONSHIP BETWEEN THE METEOR SHOWERS AND THE OCCURRENCE OF SPORADIC E OVER WUHAN
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摘要: 利用全天空流星雷达和数字测高仪联合观测数据,初步分析了武汉(30°32′N,114°22′E)上空2002年3次大的流星雨(英仙座、狮子座、双子座)及2003年象限座流星雨爆发期间Es的出现率变化趋势及其与流星观测量的关系.结果表明,在流星雨爆发时,雷达观测到的流星数目会显著增加;流星雨峰值过后,Es出现率也会增大.流星数和Es出现率间的平均互相关函数有两个峰值,第一个峰值平均出现在流星雨爆发后的第2天前后,第二个峰值平均出现在流星雨后第6天前后.我们认为,第一个峰值对应于流星雨期间的大量流星雨电离产生的Es,第二个峰值对应于流星雨后沉积的金属离子在风剪切作用下形成的Es.Abstract: This paper analyzes the relationship between the occurrence of sporadic-E and the meteor numbers during the Perseids, Leonids and Geminids meteor showers in 2002 and Quadrantids meteor shower in 2003 over Wuhan (30°32′N, 114°22′E). The data used here are derived from an all-sky meteor radar and a digital ionosonde at Wuhan. The results show that the meteor number increased during the outburst of meteor showers and that the occurrence frequency of strong Sporadic-E also increases after the outburst of meteor showers. There are two peaks for the mean Cross-correlation function between the meteor number and the occurrence rate of Sporadic-E, one appears around the second day after the outburst of meteor shower and the other appears around the sixth day. It is suggested that the first peak could correspond to the Sporadic-E produced divectely by many meteors ionization during the outburst of meteor shower, the second peak could correspond to the Sporadic-E produced by the subsequent action of wind shear on residual meteor ion concentrations.
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Key words:
- Sporadic E layer /
- Meteor shower
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