Medium-scale traveling ionospheric disturbances over Taiwan observed with HF Doppler sounding

被引:0
作者
Jiří Fišer
Jaroslav Chum
Jann-Yenq Liu
机构
[1] Czech Academy of Sciences,Institute of Atmospheric Physics
[2] Charles University in Prague,Faculty of Mathematics and Physics
[3] National Central University,Institute of Space Science
来源
Earth, Planets and Space | / 69卷
关键词
Ionosphere; MSTIDs; HF Doppler sounding;
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摘要
We analyzed horizontal velocities of medium-scale traveling ionospheric disturbances using HF Doppler sounding over Taiwan from January 2014 to January 2016. Meridional components of the observed horizontal velocities are in most cases larger than zonal components. In summer, poleward propagation prevails, whereas in winter, disturbances primarily propagate southward. Zonal components of the analyzed events are mostly eastward. Seasonal behaviors of the observed propagation directions are similar at other locations with HF Doppler sounding at middle and low latitudes. Horizontal velocities of the observed events are in the 50–400-ms−1 range. The upper limit is determined using the spacing between reflection points, making the uncertainty in velocity very large for events with velocities larger than this limit. The mean horizontal velocity is 210 ms−1. The range between the 20th and 80th percentile of horizontal velocities is 144–281 ms−1. Graphical abstract.[graphic not available: see fulltext]
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