朱正平，高紫枫，罗伟华

(中南民族大学 电子信息工程学院，武汉 430074)



中国低纬地区行星波扰动观测及其对SF的影响

朱正平，高紫枫，罗伟华

(中南民族大学 电子信息工程学院，武汉 430074)

摘要为研究在日落后反转增强(PRE)期间行进式行星波电离层扰动(TPWIDs)对F层的调制机制以及对扩展F(SF)形成和发展的作用，利用三亚地区DPS-4D数字测高仪2012年探测的34080张数字频高图数据，获取了电离层特性参数-真高，以真高的逐日变化表征行进式行星波扰动，分析了中国低纬地区SF高发季节中行星波扰动特性，并研究了行星波扰动时的不同相位对SF产生和发展的影响.结果表明：地磁平静时期，在PRE期间，TPWID行星波扰动调制着PRE时期的电场强度，根据其相位的不同能导致F层的高度上抬或下降；日落后F层高度的变化控制着SF的发生，在三亚地区真高阈值大约为250 km，即当PRE导致F层高度上抬到大于250 km时，有利于SF产生；并且在分点季节(3月，4月，9月和10月)，TPWID行星波相位也调制着SF的开始时间，即TPWID相位越大，SF发生的越早，TPWID相位越小，SF发生的越晚甚至不发生.

关键词数字频高图；行进式行星波电离层扰动；日落后反转增强；扩展F；开始时间

Observation of Planetary Wave Disturbances and Their Influence on Spread F in Low Latitude Region of China

ZhuZhengping,GaoZifeng,LuoWeihua

(College of Electronics and Information Engineering, South-Central University for Nationalities, Wuhan 430074, China)

AbstractTo study the modulation mechanism of traveling planetary wave ionospheric disturbances (TPWIDs) on F layer during pre-reversal enhancement (PRE) and its effect on the formation and development of spread F (SF), in this paper, the characteristics of planetary wave disturbance is analyzed during the high SF season in china′s low latitude region, and the influence of TPWIDs phase on the formation and development of SF is investigated by the method that TPWIDs are used to refer to oscillation of the true height, which is the day-to-day variability and one of the ionosphere characteristic parameters obtained from ionogram observed by Digital Portable Sounder 4d(DPS-4D) ionosonde at sanya in 2012. The results show that TPWIDs-type oscillations controlling the strength of the electric field during PRE, therefore, slowly push the F layer height up and down according to the TPWIDs phase in the geomagnetic quiet period. the occurrence of SF is strongly controlled by the change of post-sunset F layer height and the altitude of 250 km may be a threshold at sanya, so when the the electric PRE causes the F layer bottom side to reach heights above 250 km, it is conducive to generate SF. Also during equinox (March, April, September and October) the onset time of SF is modulated by the TPWIDs phase in such way that, when the phase greater, SF occurs earlier and when the phase smaller, SF occurs later or no SF.

Keywordsionogram; TPWIDs; PRE; spread F; the onset time

1938年，Booker和Wells[1]首次利用电离层测高仪观测夜间磁赤道地区的电离层，发现并将电离图上F层回波描迹出现弥散状的现象定义为SF，已有研究表明，当SF现象出现时，无线电信号会受到这种电离层不规则体的严重影响，其相位和振幅会出现大的波动，即闪烁现象[2].SF发生涉及多种电离层过程……