海南电离层F区不规则体的气辉观测

本文利用子午工程海南富克站(19.5°N,109.2°E)全天空气辉成像仪630nm波段的气辉图像,通过对气辉原始观测资料进行图像增强、方位校正和图像投影等预处理,得到可清晰识别电离层等离子体泡的图像产品,获得了我国海南地区首次电离层等离子体泡的光学观测结果.在此基础上,分析了等离子体泡的形状、结构、变化、空间尺度和运动速度这些基本特征.研究显示:典型的等离子体泡形状为南北分布的条状,常出现分叉现象,大部分情况整体向西倾斜;东西方向的尺寸为几十到几百公里;典型漂移速度为50~150 m·s~(-1).统计了2013年9月至2014年5月等离子体泡观测数据,发现其出现的典型季节为9—10月和2—4月、典型时间为日落后1~2个小时并持续1~4个小时左右.

Night airglow observations to irregularities in the ionospheric F region over Hainan

In this paper, airglow images of 630 nm emission are taken by an all sky imager in the Meridian Project Hainan Fuke Station(19.5°N, 109.2°E). The data processing including image enhancement, azimuth correction and image projection is performed to identify ionospheric plasma bubbles and to get clear image products. The optical observation of ionospheric plasma bubbles is the first of its kind in Hainan.With the optical measurements from September 2013 to May 2014, the spatial structure and its evolution, and the zonal drifts of plasma bubbles are analyzed. According to these observations, the plasma bubbles usually appear 1~2 hours after the sunset and last for 1~4 hours. September and October and February to April are the typical periods when the plasma bubbles appear. The shape of the plasma bubbles is just like stripes, which spread from north to south. Gradually the plasma bubbles maybe develop some bifurcations that look like plumage, and usually lean to the west. The size of the plasma bubbles in the east-west direction ranges from dozens to hundreds of kilometers. It is related to the seasonal variation. The west wall of the plasma bubbles is more steady than the east wall in the process of drifting. The typical velocity of east-west motion is in the range of 50~150 m·s^-1. The analysis reveals the main optical observing characteristics of ionospheric plasma bubbles in Hainan.