Ionospheric electron content and equivalent slab thickness in the equatorial region

1975 ◽  
Vol 80 (4) ◽  
pp. 699-701 ◽  
Author(s):  
A. Das Gupta ◽  
S. Basu ◽  
J. N. Bhar ◽  
J. C. Bhattacharyya
Keyword(s):  
Equatorial Region ◽  
Slab Thickness ◽  
Electron Content ◽  
Ionospheric Electron Content

Ionospheric electron content depletions associated with amplitude scintillations in the equatorial region

1982 ◽  
Vol 9 (2) ◽  
pp. 147-150 ◽  
Author(s):  
A. DasGupta ◽  
J. Aarons ◽  
J. A. Klobuchar ◽  
Santimay Basu ◽  
A. Bushby
Keyword(s):  
Equatorial Region ◽  
Electron Content ◽  
Ionospheric Electron Content

scholarly journals Statistical Study of Ionospheric Equivalent Slab Thickness at Guam Magnetic Equatorial Location

2021 ◽  
Vol 13 (24) ◽  
pp. 5175
Author(s):  
Yuqiang Zhang ◽  
Zhensen Wu ◽  
Jian Feng ◽  
Tong Xu ◽  
Zhongxin Deng ◽  
...  
Keyword(s):  
Geomagnetic Storm ◽  
Magnetic Activity ◽  
Equatorial Region ◽  
Topside Ionosphere ◽  
Slab Thickness ◽  
Electron Content ◽  
Total Electron ◽  
F Region ◽  
Time Period ◽  
Storm Effect

The ionospheric equivalent slab thickness (τ) is defined as the ratio of the total electron content (TEC) to the F2-layer peak electron density (NmF2), and it is a significant parameter representative of the ionosphere. In this paper, a comprehensive statistical analysis of the diurnal, seasonal, solar, and magnetic activity variations in the τ at Guam (144.86°E, 13.62°N, 5.54°N dip lat), which is located near the magnetic equator, is presented using the GPS-TEC and ionosonde NmF2 data during the years 2012–2017. It is found that, for geomagnetically quiet days, the τ reaches its maximum value in the noontime, and the peak value in winter and at the equinox are larger than that in summer. Moreover, there is a post-sunset peak observed in the winter and equinox, and the τ during the post-midnight period is smallest in equinox. The mainly diurnal and seasonal variation of τ can be explained within the framework of relative variation of TEC and NmF2 during different seasonal local time. The dependence of τ on the solar activity shows positive correlation during the daytime, and the opposite situation applies for the nighttime. Specifically, the disturbance index (DI), which can visually assess the relationship between instantaneous τ values and the median, is introduced in the paper to quantitatively describe the overall pattern of the geomagnetic storm effect on the τ variation. The results show that the geomagnetic storm seems to have positive effect on the τ during most of the storm-time period at Guam. An example, on the 1 June 2013, is also presented to analyze the physical mechanism. During the positive storms, the penetration electric field, along with storm time equator-ward neutral wind, tends to increase upward drift and uplift F region, causing the large increase in TEC, accompanied by a relatively small increase in NmF2. On the other hand, an enhanced equatorward wind tends to push more plasma, at low latitudes, into the topside ionosphere in the equatorial region, resulting in the TEC not undergoing severe depletion, as with NmF2, during the negative storms. The results would complement the analysis of τ behavior during quiet and disturbed conditions at equatorial latitudes in East Asia.

scholarly journals Ionospheric Electron Content During Solar Cycle 23

2018 ◽  
Vol 123 (6) ◽  
pp. 5223-5231 ◽  
Author(s):  
Stanley C. Solomon ◽  
Liying Qian ◽  
Anthony J. Mannucci
Keyword(s):  
Solar Cycle ◽  
Electron Content ◽  
Solar Cycle 23 ◽  
Ionospheric Electron Content

scholarly journals Ionospheric electron content: the European perspective

1998 ◽  
Vol 41 (5-6) ◽  
Author(s):  
R. Leitinger
Keyword(s):  
Working Party ◽  
Artificial Satellites ◽  
Electron Content ◽  
European Perspective ◽  
Radio Science ◽  
Geophysical Interpretation ◽  
Propagation Effects ◽  
Ionospheric Electron Content ◽  
Radio Signals ◽  
The University

The electron content of the ionosphere is an important quantity which indicates overall ionization. It is measured by means of propagation effects on radio signals which penetrate the ionosphere. In Europe relevant investigations started after the launch of the first artificial satellites. Soon the necessity arose to organize international cooperation: the regional as well as the global geographical distribution of ionization parameters is important knowledge for any meaningful geophysical interpretation of ionization parameters. Despite the fact that international scientific Unions and Committees existed and had proven their usefulness and potential, private initiatives were taken to organize cooperation in the field of research based on transionospheric propagation effects. Only in 1971 three international groups joined together to form the "Beacon Satellite Group"as a "Working Party" of COSPAR. The "Beacon Satellite Group" still exists but is now a Working Group of URSI, the International Union for Radio Science. This contribution tries to summarize the European perspective with special emphasis on the long standing cooperation between the Istituto di Ricerca sulle Onde Elettromagnetiche (IROE) at Firenze and the Institut für Meteorologie und Geophysik of the University of Graz. Examples are given of important results.

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