Anomalous TEC Disturbances of the South American Ionosphere before and after the Main Shocks of Some Powerful Chilean Earthquakes
Abstract
The analysis results of the large-scale space-time disturbances of the total electron content (TEC) of the South American ionosphere before and after the powerful Chilean earthquakes on February 27, 2010 (M=8.8), April 1, 2014 (M=8.2) and after the main shock of the Chilean earthquake on September 16, 2015 (M=8.3), according to GPS network station data, are presented.
It is studied the development in the quiet geomagnetic conditions of the anomalous in the daily courses of TEC values during the periods 18-27.02.2010 and 28.02-09.03.2010; 25.03 01.04.2014 and 02.04-09.04.2014; 17-26.09.2015, characterized by foreshock and high aftershock activities, with respect to the median levels during these periods (values of δTEC, %, the time interval is 2 hours) in the longitudes 45 105 W ( λ=15 ) and in the latitudes 0 60 S ( φ=5 ). Estimates of the characteristics of TEC disturbances (δTEC, %, spatial dimensions of ionosphere regions with anomalous TEC disturbances, duration of the disturbances in daily TEC courses) for the periods considered are presented. It is shown that the anomalous disturbances of TEC (|δTEC| ≥ 30%) in the extended regions of the ionosphere took place both before the main shocks of these Chilean earthquakes and after them independently.- Publication:
-
Eleventh Workshop on Solar Influences on the Magnetosphere, Ionosphere and Atmosphere
- Pub Date:
- September 2019
- DOI:
- 10.31401/WS.2019.proc
- Bibcode:
- 2019simi.conf..101I