Abstract
The brief review of a number of recent publications regarding pre-earthquake anomalies of ionosphere electron density is presented. It is shown that the effects of earthquakes with their epicentres located at different latitudes are observable in the low-latitude ionosphere. The paper analyses the retrospective plasma frequency data obtained by a topside ionosonde onboard the satellite Alouette 1 at the peak height of the ionospheric F region prior to several strong earthquakes. These are the earthquakes of magnitudes M ≥6 that have occurred in the American longitudinal zone with their epicentres located within the ±20° range of magnetic inclination. Bottomside ionograms of nearby ionospheric stations Huancayo, La Paz, Talara and Bogota are also used. Only the data for quiet geomagnetic conditions are considered. The main peculiarities of the F peak electron density modification at low latitudes are summarized. Their possible explanation within the framework of already existing approaches is proposed.
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