Comparative study of ionospheric sporadic E occurrence rates using SNRnstd and S4 derived from GPS radio occultation

Tang, Long; Li, Jiaxing; Zhang, Fenkai; Zou, Fang

doi:10.1007/s10291-023-01464-y

Cited by 1 publication

(1 citation statement)

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“…Traditional observational methods for MSTIDs research primarily involve the use of airglow imagers, ionosondes, high‐frequency (HF) radars, coherent and incoherent scatter radars, and other observational instruments (Kelley, 2009; Li et al., 2021; Ren et al., 2022; Tang et al., 2023). Since the late 20th century, with the establishment of Global Navigation Satellite System (GNSS) monitoring networks and the construction of densely distributed continuously operating tracking stations in various regions, Total Electron Content (TEC) obtained by utilizing GNSS dual‐frequency observations has become one of the most widely applied methods for observing ionospheric perturbations (Ho et al., 1996; Saito et al., 1998; Tang & Chen, 2022).…”

Section: Introductionmentioning

confidence: 99%

Occurrence and Characteristics of Medium‐Scale Traveling Ionospheric Disturbances Observed by BeiDou GEO Satellites Over Hong Kong

Le,

Ren,

Mei

et al. 2024

JGR Space Physics

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Medium‐scale traveling ionospheric disturbances (MSTIDs) can significantly alter a region's ionosphere features, severely impacting the performance and stability of services such as shortwave communication and navigation positioning. By utilizing the total electron content (TEC) data from BeiDou geostationary satellites for 2022–2023, this study investigated the characteristics of MSTIDs over Hong Kong concerning local time and seasons. A total of 622 MSTID events were observed, classified into three types: daytime (10:00–17:00 LT), twilight (17:00–22:00 LT), and nighttime (22:00–02:00 LT). The occurrence rates and excitation mechanisms of the three types of MSTIDs were analyzed. Daytime and twilight MSTIDs had higher occurrence rates during winter, while nighttime MSTIDs had higher occurrence rates in summer and were even absent during winter. Overall, daytime MSTIDs were the most common, followed by twilight MSTIDs, while nighttime MSTIDs were less frequent. The propagation directions of MSTIDs exhibited anisotropy but showed some clustering patterns. Daytime MSTIDs exhibited high directional diversity during summer, but more concentrated in winter. Nighttime MSTIDs, on the other hand, were more focused during summer. It is worth noting that twilight MSTIDs exhibit similar climatological characteristics to daytime MSTIDs, which have not been observed in previous studies. It is suggested that daytime MSTIDs in the Hong Kong region are likely primarily generated by atmospheric gravity waves (AGWs) from low‐latitude regions, while nighttime MSTIDs are likely caused by Perkins instability. Twilight MSTIDs may originate from AGWs at the solar terminator, as well as daytime MSTIDs propagated from mid‐latitude areas.

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