Daytime Periodic Wave‐like Structures in the Ionosphere Observed at Low Latitudes over the Asian‐Australian Sector Using Total Electron Content from Beidou Geostationary Satellites

Abstract

Daytime periodic wave-like structures are statistically analyzed for the first time in the low-latitude ionosphere over the Asian-Australian sector using total electron content from Beidou geostationary satellites during 2016-2017. These structures have periods of about 18-28 min, which frequently occur during 11:00-17:00 local time in the winter at latitudes ranging between 17 and 25°N (10-18°N magnetic latitude [MLAT]) in the Northern Hemisphere, where they have a maximum occurrence rate of 80% at~21°N (14°N MLAT). In the Southern Hemisphere, daytime periodic wave-like structures are also observed during 11:00-15:00 local time in the winter within latitudes ranging between 6.0 and 11.1°S (15.4-21.6°S MLAT), although the peak occurrence rate is only approximately 40%. Compared with stratospheric gravity waves (GWs), the seasonal and latitudinal variations of daytime periodic wave-like structures are generally consistent with those of stratospheric GWs. This gives a possible argument that daytime periodic wave-like structures in the low-latitude ionosphere could be generated in the low-latitude ionosphere and triggered by GWs from the lower atmosphere.

Persistence of the Long‐Duration Daytime TEC Enhancements at Different Longitudinal Sectors During the August 2018 Geomagnetic Storm

“…To study the ionospheric responses to the August 2018 geomagnetic storm, multiple ionospheric data sets are collected including: (1) the Beidou GEO TECs with 30‐s time resolution from 15 receivers at the Asian‐Australian sector (near 110°E) (Huang et al, 2019); (2) the Global Navigation Satellite System (GNSS) TECs provided by the MIT Haystack Observatory at a 5 min and 1° × 1° (latitude × longitude) resolution over the American (70°W) and the African (40°E) longitudinal sectors (Rideout & Coster, 2006); (3) the electron density ( Ne ) profiles from ionosondes at Wuhan (24.4°N magnetic latitude), Shaoyang (21.0°N magnetic latitude), Sanya (11.6°N magnetic latitude), Jicamarca (0.1°N magnetic latitude), and Cachoeira Paulista (18.8°S magnetic latitude). The location information about the stations of Beidou GEO TEC and ionosondes is listed in Table 1, and their distributions are shown in the map of Figure 2.…”

IONISE: An Ionospheric Observational Network for Irregularity and Scintillation in East and Southeast Asia

“…These different features of TIDs were related to different mechanisms. More recently, Huang et al (2019) reported a peak occurrence of daytime TID at ~21°N over the low‐latitude region of Asian‐Australian sector. The potential sources and generation mechanisms still remain unclear.…”

Ionospheric Responses at Low Latitudes to the Annular Solar Eclipse on 21 June 2020

“…In this study, Beidou GEO TEC data with a time resolution of 30 s from 15 GNSS receiver stations were used. The Beidou GEO TEC can provide ionospheric observations along fixed paths since ionospheric pierce points (IPPs) almost do not move (Huang et al, 2017(Huang et al, , 2018(Huang et al, , 2019. Thus, it gives a high-fidelity observation to detect the ionospheric variations, for instance, the changes induced by the eclipse.…”