2007/11/01 by Takuya Tsugawa, Yuichi Otsuka, A. J. Coster +1 · 1 citation
Physics and Astronomy · Earth and Planetary Sciences · Engineering · #Ionosphere and magnetosphere dynamics #Earthquake Detection and Analysis #GNSS positioning and interference
paper · pdf · doi:10.1029/2007gl031663
openalex publication_date 2007/11/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/25
Nighttime and daytime medium‐scale traveling ionospheric disturbances (MSTIDs) are detected with dense and wide detrended total electron content (TEC) maps over North America using multiple GPS receiver networks. The TEC maps cover a wide region of 60–130°W and 24–54°N (30–65°N in geomagnetic latitude), and have a spatial resolution of 1.05° × 1.05° in latitude and longitude (0.15° × 0.15° with 7 × 7 pixel smoothing) and a temporal resolution of 30 seconds. The TEC maps reveal, for the first time, that the nighttime MSTIDs propagate southwestward with 200–500 km wavelengths over North America and have wavefronts longer than ∼2,000 km. We also observe that daytime MSTIDs with 300–1,000 km wavelengths propagate southeastward until mid‐afternoon and southwestward in the late afternoon. In the mid‐to‐late afternoon, these MSTIDs propagating in the different directions are superimposed. The TEC maps can be a new powerful tool to investigate the MSTIDs.