scholarly journals Seasonal and solar cycle variations of night-time anomalous enhancements in total electron content

1986 ◽  
Vol 95 (3) ◽  
pp. 409-416
Author(s):  
N. Balan ◽  
P. B. Rao ◽  
K. N. Iyer
Keyword(s):  
Solar Cycle ◽  
Total Electron Content ◽  
Electron Content ◽  
Night Time ◽  
Total Electron

scholarly journals Spatial, Seasonal, and Solar Cycle Variations of the Martian Total Electron Content (TEC): Is the TEC a Good Tracer for Atmospheric Cycles?

2018 ◽  
Vol 123 (7) ◽  
pp. 1746-1759 ◽  
Author(s):  
Beatriz Sánchez-Cano ◽  
Mark Lester ◽  
Olivier Witasse ◽  
Pierre-Louis Blelly ◽  
Mikel Indurain ◽  
...  
Keyword(s):  
Solar Cycle ◽  
Total Electron Content ◽  
Electron Content ◽  
Total Electron ◽  
Good Tracer

Variations of total electron content over high latitude region during the ascending phase of 24th solar cycle

2019 ◽  
Vol 63 (11) ◽  
pp. 3558-3567
Author(s):  
Arun Kumar Singh ◽  
Rupesh M. Das ◽  
Shailendra Saini
Keyword(s):  
Solar Cycle ◽  
Total Electron Content ◽  
High Latitude ◽  
Electron Content ◽  
Total Electron ◽  
High Latitude Region ◽  
Latitude Region

scholarly journals Diurnal, seasonal and solar cycle variation of total electron content and comparison with the IRI-2016 model at Birnin Kebbi

2019 ◽  
Author(s):  
Aghogho Ogwala ◽  
Emmanuel Olufemi Somoye ◽  
Olugbenga Ogunmudimu ◽  
Rasaq Adewemimo Adeniji-Adele ◽  
Eugene Ogheneakpobor Onori ◽  
...  
Keyword(s):  
Solar Cycle ◽  
Diurnal Variation ◽  
Total Electron Content ◽  
Electron Content ◽  
Total Electron ◽  
Equatorial Station ◽  
Solar Cycle Variation ◽  
June Solstice ◽  
December Solstice ◽  
Cycle Dependence

Abstract. Total Electron Content (TEC) is an important ionospheric parameter used to monitor possible space weather impacts on satellite to ground communication and satellite navigation system. TEC is modified in the ionosphere by changing solar Extreme Ultra-Violet (EUV) radiation, geomagnetic storms, and the atmospheric waves that propagate up from the lower atmosphere. Therefore, TEC depends on local time, latitude, longitude, season, geomagnetic conditions, solar cycle activity, and condition of the troposphere. A dual frequency GPS receiver located at an equatorial station, Birnin-Kebbi in Northern Nigeria (geographic location: 12.64° N; 4.22° E), has been used to investigate variation of TEC during the period of 2011 to 2014. We investigate the diurnal, seasonal and solar cycle dependence of observed (OBS) TEC and comparison with latest version of International Reference Ionosphere (IRI-2016) model. On a general note, diurnal variation reveals discrepancies between OBS-TEC and IRI-2016 model for all hours of the day except during the post-midnight hours. Slight post-noon peaks in the daytime maximum and post-sunset decrease and enhancement are observed in the diurnal variation of OBS-TEC of some months. On a seasonal scale, we observed that OBS-TEC values were higher in the equinoxes than the solstices only in 2012. Where as in 2011, September equinox and December solstice recorded higher magnitude followed by March equinox and lowest in June solstice. In 2013, December solstice magnitude was highest, followed by the equinoxes and lowest in June solstice. In 2014, March equinox and December solstice magnitude were higher than September equinox and June solstice magnitude. June solstice consistently recorded the lowest values for all the years. OBS-TEC is found to increase from 2011 to 2014, thus revealing solar cycle dependence.

scholarly journals Storm time changes in total electron content in ionosphere measured by low orbiting topside sounder

2004 ◽  
Vol 22 (8) ◽  
pp. 2741-2746 ◽  
Author(s):  
N. Beloff ◽  
P. F. Denisenko ◽  
I. I. Ivanov ◽  
O. A. Maltseva ◽  
M. P. Gough ◽  
...  
Keyword(s):  
Total Electron Content ◽  
Experimental Technique ◽  
Geomagnetic Latitude ◽  
Wave Structure ◽  
Electron Content ◽  
Night Time ◽  
Total Electron ◽  
Main Ionospheric Trough ◽  
Time Changes

Abstract. A new experimental technique is presented for the determination of the total electron content (TEC) below a low-orbiting satellite. According to this technique TEC can be obtained using the segment of a topside ionogram that only contains the traces of signals reflected from the Earth's surface. Possibilities of this technique were demonstrated using MIR station topside sounding data at the night time for both quiet and disturbed ionospheric conditions, and in particular, during the 14 November 1998 storm. An interesting fact was revealed with the help of this technique: after a series of relatively strong storms the main ionospheric trough on 14 November 1998 was detected at an abnormally low geomagnetic latitude (~43°). During this study some spatial variations of TEC were registered that can be interpreted as a TID-type wave structure.

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