scholarly journals Global Variations of Ionospheric Total Electron Content (TEC) Derived from GPS Global Ionospheric Maps

2017 ◽  
Vol 9 (2) ◽  
pp. 141
Author(s):  
Hintsa Gebreselasse ◽  
Gebregiorgis Abraha
Keyword(s):  
Total Electron Content ◽  
Electron Content ◽  
Total Electron ◽  
Ionospheric Total Electron Content ◽  
Global Ionospheric Maps

scholarly journals Measurement of Ionospheric Total Electron Content Using Single-Frequency Geostationary Satellite Observations

Radio Science ◽  
2019 ◽  
Vol 54 (1) ◽  
pp. 10-19 ◽  
Author(s):  
C. Cooper ◽  
C. N. Mitchell ◽  
C. J. Wright ◽  
D. R. Jackson ◽  
B. A. Witvliet
Keyword(s):  
Total Electron Content ◽  
Geostationary Satellite ◽  
Satellite Observations ◽  
Single Frequency ◽  
Electron Content ◽  
Total Electron ◽  
Ionospheric Total Electron Content

scholarly journals Case study on total electron content enhancements at low latitudes during low geomagnetic activities before the storms

2008 ◽  
Vol 26 (4) ◽  
pp. 893-903 ◽  
Author(s):  
◽  
◽  
◽  
Keyword(s):  
Total Electron Content ◽  
Geomagnetic Activity ◽  
Electron Content ◽  
Low Latitude ◽  
Total Electron ◽  
Defense Meteorological Satellite Program ◽  
Low Latitudes ◽  
Global Ionospheric Maps ◽  
Geomagnetic Activities

Abstract. Sometimes the ionospheric total electron content (TEC) is significantly enhanced during low geomagnetic activities before storms. In this article, we investigate the characteristics of those interesting TEC enhancements using regional and global TEC data. We analyzed the low-latitude TEC enhancement events that occurred around longitude 120° E on 10 February 2004, 21 January 2004, and 4 March 2001, respectively. The TEC data are derived from regional Global Positioning System (GPS) observations in the Asia/Australia sector as well as global ionospheric maps (GIMs) produced by Jet Propulsion Laboratory (JPL). Strong enhancements under low geomagnetic activity before the storms are simultaneously presented at low latitudes in the Asia/Australia sector in regional TEC and JPL GIMs. These TEC enhancements are shown to be regional events with longitudinal and latitudinal extent. The regions of TEC enhancements during these events are confined at narrow longitude ranges around longitude 120° E. The latitudinal belts of maxima of enhancements locate around the northern and southern equatorial ionization anomaly (EIA) crests, which are consistent with those low-latitude events presented by Liu et al. (2008). During the 4 March 2001 event, the total plasma density Ni observed by the Defense Meteorological Satellite Program (DMSP) spacecraft F13 at 840 km altitude are of considerably higher values on 4 March than on the previous day in the TEC enhanced regions. Some TEC enhancement events are possibly due to contributions from auroral/magnetospheric origins; while there are also quasi-periodic enhancement events not related to geomagnetic activity and associated probably with planetary wave type oscillations (e.g. the 6 January 1998 event). Further investigation is warrented to identify/separate contributions from possible sources.

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