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The X-pattern Merging of the Equatorial Ionization Anomaly Crests
2023A unique phenomenon {\textendash} merging of Equatorial Ionization Anomaly (EIA) crests, leading to an X-pattern (EIA-X) around the magnetic equator {\textendash} has been observed in the night-time ionospheric measurements by the Global-scale Observations of the Limb and Disk (GOLD) mission.
Fazlul I Laskar +9 more
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Six‐Day Periodic Variation in Equatorial Ionization Anomaly Region
Journal of Geophysical Research: Space Physics, 2020AbstractUsing the location of equatorial ionization anomaly (EIA) crest derived from GPS observations and CHAllenging Minisatellite Payload (CHAMP) satellite measurement, along with the F2 layer peak height (hmF2), critical frequency (foF2), and the equatorial electrojet (EEJ) in India and China longitudinal sectors, we found the obvious 6‐day ...
X. H. Mo, D. H. Zhang
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Long-Term Trends in the Equatorial Ionization Anomaly 
2022<p>Due to the special geometry of the electric and magnetic fields at the equator, the vertical ExB drift removes plasma from the geomagnetic equator via an equatorial plasma fountain. This process forms the equatorial ionization anomaly (EIA) by creating the crests at/around 20&#176; latitudes on either side of the geomagnetic ...
Sovit Khadka, Andrew Gerrard
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Two‐day oscillation of the equatorial ionization anomaly
Journal of Geophysical Research: Space Physics, 1992The day‐to‐day variability of the equatorial ionization anomaly (EIA), especially the 2‐day oscillation of the EIA, has recently been studied in China. We suggest that the main driving source of the 2‐day oscillation (or the day‐to‐day variation) of the EIA is a planetary wave with a 2‐day period (or the superposition of planetary waves with different ...
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Advances in Space Research, 2018
Abstract We study the relationship of equatorial ionization anomaly (EIA) to the occurrence of nighttime equatorial spread F (ESF) using data from ground-based GPS stations and a horizontal meridional neutral wind model for the East African sector. Anomaly strength, symmetry of anomaly crests, horizontal meridional wind magnitude and direction, and ...
Ephrem Beshir Seba +2 more
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Abstract We study the relationship of equatorial ionization anomaly (EIA) to the occurrence of nighttime equatorial spread F (ESF) using data from ground-based GPS stations and a horizontal meridional neutral wind model for the East African sector. Anomaly strength, symmetry of anomaly crests, horizontal meridional wind magnitude and direction, and ...
Ephrem Beshir Seba +2 more
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An additional plasma density peak at poleward of the equatorial ionization anomaly crests
2023The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)
Xiong, C., Huang, Y.
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Magnetospheric disturbance effects on the Equatorial Ionization Anomaly (EIA) : an overview
Journal of Atmospheric and Terrestrial Physics, 1991Abstract The Equatorial lonization Anomaly (EIA) development can undergo drastic modification in the form of an anomalous occurrence at local times outside that of its quiet time development and/or inhibition/enhancement at local times of its normal occurrences.
M.A. Abdu +3 more
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Advances in Space Research, 2021
Abstract In this study, the association of Equatorial Ionization Anomaly (EIA) with various post sunset ionospheric irregularity manifestations are brought out empirically using Global Positioning System derived Total Electron Content (GPS - TEC) data from five stations centered around 77° E longitude as well as ionosonde data at a dip equatorial ...
R.P Aswathy, G. Manju
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Abstract In this study, the association of Equatorial Ionization Anomaly (EIA) with various post sunset ionospheric irregularity manifestations are brought out empirically using Global Positioning System derived Total Electron Content (GPS - TEC) data from five stations centered around 77° E longitude as well as ionosonde data at a dip equatorial ...
R.P Aswathy, G. Manju
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Equatorial Ionization Anomaly Crest Parameters Modeling
 Knowing the locations of the north and south Equatorial Ionization Anomaly (EIA) crests and their corresponding widths is essential for characterizing the spatiotemporal and solar activity variations of the low latitude ionosphere. The crest region is characterized by strong electron density gradients that significantly affect GNSS ...Melessew Nigussie +2 more
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Journal of Geophysical Research: Space Physics, 2018
AbstractThe time delay with which the magnitude and location of the total electron content (TEC) at the equatorial ionization anomaly (EIA) crest responds to the mean height of the F layer (hmF2) is examined seasonally using the ionosonde data at Trivandrum and the Global Positioning System data at different stations in the EIA region for low and high ...
R. P. Aswathy, G. Manju, Surendra Sunda
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AbstractThe time delay with which the magnitude and location of the total electron content (TEC) at the equatorial ionization anomaly (EIA) crest responds to the mean height of the F layer (hmF2) is examined seasonally using the ionosonde data at Trivandrum and the Global Positioning System data at different stations in the EIA region for low and high ...
R. P. Aswathy, G. Manju, Surendra Sunda
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