高纬地区电离层扩展F发生时间研究
Occurrence time of ionospheric spread F observed over high latitude stations
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摘要: 利用高纬地区Zhigansk、Yakutsk两个台站的 DPS4电离层测高仪2006年观测到的扩展F（SpreadF,SF）数据统计分析了两台站不同类型SF出现的地方时分布及其季节变化.结果表明：Zhigansk和Yakutsk两个台站观测到的SF主要类型都是频率扩展（Frequency SpreadF,FSF ）和混合扩展（Mixed SpreadF, MSF）；两台站FSF出现的时间范围具有明显的季节变化，而MSF在各个季节都主要出现在18∶00—06∶00LT.通过分析可以认为这两个高纬度地区FSF的发生主要与电离槽有关，而MSF主要与夜侧磁层粒子沉降有关.Abstract: In this paper， the data from DPS4 digisonde at high latitude stations Zhigansk and Yakutsk in 2006 are used to study the occurrence time and the seasonal variations of four types of ionospheric SF.The results show that the frequency spreadF (FSF) and mixed spreadF (MSF) are the main types over Zhigansk and Yakutsk.The FSF occurrence time has significant seasonal variations over both two stations，while MSF almost occurs during 18∶00-06∶00LT in all seasons.The high latitude ionospheric trough may be the main reason of the FSF occurrence，the precipitation particles and Joule heating in nightside magnetosphere may be the principal cause of MSF.
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