Absence of high frequency echoes from ionosondes during the 23â25 April...
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https://data.zh-cn.virginia.gov/dataset/absence-of-high-frequency-echoes-from-ionosondes-during-the-23a25-april-2023-geomagnetic-storm-
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资源简介：
We report an unusual event on absence of high frequency (HF) echoes in ionosonde observations from the ionospheric F2 region during the geomagnetic storm of 23-25 April 2023....
