A total of 10 radars from the Super Dual Auroral Radar Network (SuperDARN) in Antarctica were used to estimate the spatial area over which energetic electron precipitation (EEP) impacts the D-region ionosphere during pulsating aurora (PsA) events. We use an all-sky camera (ASC) located at Syowa Station to confirm the presence of optical PsAs, and then we use the SuperDARN radars to detect high frequency (HF) radio attenuation caused by enhanced ionisation in the D-region ionosphere. The HF radio attenuation was identified visually by examining quick-look plots of the background HF radio noise and backscatter power from each radar. The EEP impact area was determined for 74 PsA events. Approximately one-third of these events have an EEP impact area that covers at least 12^∘ of magnetic latitude, and three-quarters cover at least 4^∘ of magnetic latitude. At the equatorward edge of the auroral oval, 44 % of events have a magnetic local time extent of at least 7 h, but this reduces to 17 % at the poleward edge. We use these results to estimate the average size of the EEP impact area during PsAs, which could be used as a model input for determining the impact of PsA-related EEP on the atmospheric chemistry.

中文翻译：

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脉动极光期间高能电子沉淀的D区影响区域

来自南极洲的超级双极光雷达网络（SuperDARN）的总共10台雷达被用于估算在脉动极光（PsA）事件期间高能电子降水（EEP）影响D区电离层的空间区域。我们使用位于Syowa站的全天候摄像机（ASC）确认光学PsAs的存在，然后使用SuperDARN雷达检测D区电离层电离层增强引起的高频（HF）无线电衰减。通过检查背景HF无线电噪声和每个雷达的反向散射功率的快速查看图，可以从视觉上识别HF无线电衰减。确定了74个PsA事件的EEP影响范围。这些事件中约有三分之一的EEP影响范围至少覆盖了^12∘磁纬度，四分之三覆盖至少^4∘磁纬度。在极光椭圆的赤道边缘，有44％的事件的磁局部时间范围至少为7 h，但在极向边缘的事件减少至17％。我们使用这些结果来估计PsA期间EEP影响区域的平均大小，可以将其用作确定PsA相关EEP对大气化学影响的模型输入。