Abstract
VHF scintillations and plasma drifts observed in southern Taiwan during the declining phase of solar cycle 24
Highlights
Scintillation involves ionospheric irregularities interfering with radio signals when radio waves are propagating through the ionosphere
A valuable data set of scintillations and plasma drifts is derived from 5 years of very high frequency (VHF) observations conducted in Pingtung, Taiwan, where is under the northern equatorial ionization anomaly (EIA) region
The results show that strong scintillations (S4 > 0.5) appear frequently at early nighttime in spring and fall during the high solar activity year of 2015, while weak scintillons (S4: 0.2 - 0.5) occur often at early daytime and more frequently at early nighttime in summer without obvious correlation with solar activity levels
Summary
Scintillation involves ionospheric irregularities interfering with radio signals when radio waves are propagating through the ionosphere. The electromagnetic energy of signals is scattered and redistributed when the signals propagate through ionospheric irregularities, especially in the F-region, where ionized gas is most abundant. Scientists observed strong scintillations in the very high frequency (VHF) and L bands in the equatorial ionization anomaly (EIA) region during post-sunset hours (Basu et al 1987; Wiens et al 2006; McNamara et al 2013; Olwendo et al 2013; Liu et al 2016; Chen et al 2017; Seif et al 2017; Bhattacharyya et al 2019). Based on global observations of GPS radio occultation, Liu et al (2016) reported that strong L-band scintillations appear within the low-latitude region of ±30°N, centering around ±20°N magnetic latitude.
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