scholarly journals Anomalous enhancement of ionosphericF2layer critical frequency and total electron content over low latitudes before three recent major earthquakes in China

2010 ◽  
Vol 115 (A11) ◽  
pp. n/a-n/a ◽  
Author(s):  
Kavita Sharma ◽  
R. S. Dabas ◽  
S. K. Sarkar ◽  
R. M. Das ◽  
Sudha Ravindran ◽  
...  
Keyword(s):  
Total Electron Content ◽  
Critical Frequency ◽  
Electron Content ◽  
Total Electron ◽  
Low Latitudes ◽  
Earthquakes In China

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.

scholarly journals Response of the total electron content at Brazilian low latitudes to corotating interaction region and high-speed streams during solar minimum 2008

2018 ◽  
Vol 70 (1) ◽  
Author(s):  
Claudia M. N. Candido ◽  
Inez S. Batista ◽  
Virginia Klausner ◽  
Patricia M. de Siqueira Negreti ◽  
Fabio Becker-Guedes ◽  
...  
Keyword(s):  
Total Electron Content ◽  
Solar Minimum ◽  
High Speed ◽  
Interaction Region ◽  
Electron Content ◽  
Corotating Interaction Region ◽  
Total Electron ◽  
Low Latitudes

Total electron content at low latitudes and its comparison with the IRI90

1994 ◽  
Vol 14 (12) ◽  
pp. 87-90 ◽  
Author(s):  
I.S. Batista ◽  
J.R. de Souza ◽  
M.A. Abdu ◽  
E.R. de Paula
Keyword(s):  
Total Electron Content ◽  
Electron Content ◽  
Total Electron ◽  
Low Latitudes

Anomaly effects of 6–10 September 2017 solar flares on ionospheric total electron content over Saudi Arabian low latitudes

2020 ◽  
Vol 177 ◽  
pp. 332-340
Author(s):  
Kanaka Durga Reddybattula ◽  
Sampad Kumar Panda ◽  
Sunil Kumar Sharma ◽  
Arun Kumar Singh ◽  
Kasmira Kurnala ◽  
...  
Keyword(s):  
Total Electron Content ◽  
Solar Flares ◽  
Saudi Arabian ◽  
Electron Content ◽  
Total Electron ◽  
Ionospheric Total Electron Content ◽  
Low Latitudes

Modulation of total electron content by global Pc5 waves at low latitudes

2016 ◽  
Vol 57 (1) ◽  
pp. 309-319 ◽  
Author(s):  
E. Vorontsova ◽  
V. Pilipenko ◽  
E. Fedorov ◽  
A.K. Sinha ◽  
G. Vichare
Keyword(s):  
Total Electron Content ◽  
Electron Content ◽  
Total Electron ◽  
Low Latitudes

Total electron content at low latitudes

1978 ◽  
Vol 87 (1) ◽  
pp. 47-55
Author(s):  
Malkiat Singh ◽  
H S Gurm ◽  
M R Deshpande ◽  
R G Rastogi ◽  
G Sethia ◽  
...  
Keyword(s):  
Total Electron Content ◽  
Electron Content ◽  
Total Electron ◽  
Low Latitudes

scholarly journals Annual and semiannual variations of vertical total electron content during high solar activity based on GPS observations

2011 ◽  
Vol 29 (5) ◽  
pp. 865-873 ◽  
Author(s):  
M. P. Natali ◽  
A. Meza
Keyword(s):  
Solar Activity ◽  
Total Electron Content ◽  
Principal Component ◽  
High Solar Activity ◽  
Electron Content ◽  
Vertical Total Electron Content ◽  
Total Electron ◽  
Ionospheric Variability ◽  
Low Latitudes ◽  
Sudden Decrease

Abstract. Annual, semiannual and seasonal variations of the Vertical Total Electron Content (VTEC) have been investigated during high solar activity in 2000. In this work we use Global IGS VTEC maps and Principal Component Analysis to study spatial and temporal ionospheric variability. The behavior of VTEC variations at two-hour periods, at noon and at night is analyzed. Particular characteristics associated with each period and the geomagnetic regions are highlighted. The variations at night are smaller than those obtained at noon. At noon it is possible to see patterns of the seasonal variation at high latitude, and patterns of the semiannual anomaly at low latitudes with a slow decrease towards mid latitudes. At night there is no evidence of seasonal or annual anomaly for any region, but it was possible to see the semiannual anomaly at low latitudes with a sudden decrease towards mid latitudes. In general, the semiannual behavior shows March–April equinox at least 40 % higher than September one. Similarities and differences are analyzed also with regard to the same analysis done for a period of low solar activity.

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