Articles | Volume 36, issue 2
Ann. Geophys., 36, 459–471, 2018
https://doi.org/10.5194/angeo-36-459-2018

Special issue: Space weather connections to near-Earth space and the...

Ann. Geophys., 36, 459–471, 2018
https://doi.org/10.5194/angeo-36-459-2018

Regular paper 21 Mar 2018

Regular paper | 21 Mar 2018

Wavenumber-4 structures observed in the low-latitude ionosphere during low and high solar activity periods using FORMOSAT/COSMIC observations

Amelia Naomi Onohara et al.

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Short summary
Global coverage measurements made by satellites have provided observational studies which have shown the presence of four peaks in global longitudinal structures from global local time observations of equatorial ionization anomalies. The structures seen in the ionosphere are related to the diurnal non-migrating wave that comes from the troposphere and can be noticed in periods of low and high solar activity in the low-latitude ionosphere regions, mainly at altitudes from ~ 250 km up to ~ 800 km.