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F-lacuna是高纬极区电离层测高仪频高图上经常出现的一种F层回波描迹部分或全部消失的现象,直接影响电离层参数的标定,其表征的电离层物理过程尚未定论.利用南极中山站测高仪频高图数据,本文统计分析了Flacuna在不同太阳风速度水平下的发生频率,主要对2012年2月15日一次F2-lacuna观测实例的粒子沉降及电离层特性进行了分析.观测特征表明,F2-lacuna发生期间,电离层电子总含量TEC明显减小,昭和站SuperDARN高频雷达观测到的中山站上空电离层Bragg后向散射增强,但对应来自磁层的电子和离子沉降并不明显.这可能是由磁层亚暴引起的极区电离层电流体系扰动,触发电离层F-B不稳定性,产生沿场向排列的小尺度不规则体,其热效应导致F2层密度减小,F2-lacuna出现.
F-lacuna is a kind of phenomenon that the F-layer echographic trace disappears partially or completely, which often appears on the frequency-height graph of the ionosphere altimeter in the high latitude region. It directly affects the calibration of the ionospheric parameters. The characterization of the ionospheric physical processes The frequency of the Flacuna at different solar wind speed levels is statistically analyzed by using the data of the altimeter of the altimeter in Zhongshan Station, Antarctica. The frequency of the occurrence of the Flacuna at different solar wind speed levels is mainly analyzed on the particle settlement and ionosphere of an F2-lacuna observation case on February 15, 2012 Characteristics of the ionosphere were analyzed.The observational characteristics show that the TEC of the ionospheric electrons decreased significantly during the F2-lacuna generation, and the Bragg backscattering of the ionosphere over the Zhongshan station was observed by the SuperDARN HF radar in Showa Denko Station, Of the electron and ion deposition is not obvious.This may be caused by sub-stratospheric ionospheric ionospheric current system disturbance, trigger ionospheric FB instability, resulting in the field along the small scale irregularity, the thermal effect of F2 layer density decreases, F2-lacuna appears.