Results 41 to 50 of about 5,760 (194)

Transition of Interhemispheric Asymmetry of Equatorial Ionization Anomaly During Solstices [PDF]

Journal of Geophysical Research: Space Physics, 2018
AbstractThe magnitudes of the two crests of equatorial ionization anomaly (EIA) vary with local time. During the solstices, EIA crest in the winter hemisphere is larger than that in the summer hemisphere before noon/early afternoon. Whereafter, the crest in the summer hemisphere becomes intensified, and the stronger EIA crest transits to the summer ...
He Huang, Xian Lu, Libo Liu, Wenbin Wang, Qiaoling Li   +4 more
openaire   +1 more source

An investigation of solar flare effects on equatorial ionosphere and thermosphere using co-ordinated measurements

Earth, Planets and Space, 2019
The response of equatorial ionosphere–thermosphere system to the X3.8 solar flare of January 17, 2005 has been studied using the coordinated measurements of GPS-derived Total Electron Content (TEC), OI 630.0 nm dayglow and magnetic field measurements ...
S. G. Sumod, Tarun Kumar Pant
doaj   +1 more source

Assessment of the Performance of Ionospheric Models with NavIC Observations during Geomagnetic Storms

, 2020
The paper presents an assessment of the performances of the global empirical models: International Reference Ionosphere (IRI)-2016 and the NeQuick2 model derived ionospheric Total Electron Content (TEC) with respect to the Navigation with Indian ...
balan, hochegger, jakowski, mruthyunjaya, radicella   +4 more
core   +1 more source

A study on the variability of ionospheric total electron content over the East African low-latitude region and storm time ionospheric variations [PDF]

, 2016
The variation of total electron content (TEC) derived from the International Global Navigation Satellite Systems Service receiver (formerly IGS) over the East African low-latitude region from up to 12 observation stations for the period 2012 was analyzed.
Baki, P., Cilliers, P. J., Doherty, P., Olwendo, O. J., Yamazaki, Yosuke   +4 more
core   +1 more source

Morphological Characteristics of Equatorial Ionization Anomaly Crest Over Nanning Region [PDF]

Radio Science, 2018
AbstractUsing the ionospheric total electron content (TEC) and the location of the equatorial ionization anomaly (EIA) crest derived from GPS data observed at Nanning (22.84°N, 108.33°E, dip latitude ~ 12.14°N), China, a GPS station situated near the daytime EIA crest region, the local time, seasonal, and solar cycle variations of EIA crests from 2006 ...
X. H. Mo, D. H. Zhang, J. Liu, Y. Q. Hao, J. F. Ye, J. S. Qin, W. X. Wei, Z. Xiao   +7 more
openaire   +1 more source

Prediction of the thermospheric and ionospheric responses to the 21 June 2020 annular solar eclipse

Earth and Planetary Physics, 2020
On 21 June 2020, an annular solar eclipse will traverse the low latitudes from Africa to Southeast Asia. The highest latitude of the maximum eclipse obscuration is approximately 30°.
Tong Dang, JiuHou Lei, WenBin Wang, MaoDong Yan, DeXin Ren, FuQing Huang   +5 more
doaj   +1 more source

Atmospheric temperature responses to solar irradiance and geomagnetic activity [PDF]

, 2005
The relative effects of solar irradiance and geomagnetic activity on the atmospheric temperature anomalies (Ta) are examined from the monthly to interdecadal timescales. Geomagnetic Ap (Ap) signals are found primarily in the stratosphere, while the solar
Hua Lu, Martin J. Jarvis, Hans-F. Graf, Peter C. Young, Richard B. Horne, Arnold, Baldwin, Baldwin, Boberg, Bochnicek, Brasseur, Bucha, Callis, Callis, Clilverd, Crooks, Davis, Ebisuzaki, Egorova, Garrett, Gleisner, Gray, Gray, Haigh, Haigh, Haigh, Haigh, Haigh, Hinteregger, Holton, Hood, Hoyt, Jackman, Keckhut, Kodera, Kodera, Kodera, Kuroda, Labitzke, Labitzke, Labitzke, Labitzke, Labitzke, Labitzke, Labitzke, Labitzke, Lean, Lean, Matthes, Mayaud, Naito, Naujokat, Orsolini, Pascoe, Randall, Randall, Randel, Renard, Rinsland, Rottman, Rozanov, Salby, Scaife, Seidel, Sheeley, Shindell, Shindell, Siskind, Solomon, Thejll, Thiebaux, Thorne, Thorne, van Loon, Vennerstrom, Young, Young   +76 more
core   +2 more sources

The combined effects of electrojet strength and the geomagnetic activity (K_p-index) on the post sunset height rise of the F-layer and its role in the generation of ESF during high and low solar activity periods [PDF]

Annales Geophysicae, 2007
Several investigations have been carried out to identify the factors that are responsible for the day-to-day variability in the occurrence of equatorial spread-F (ESF). But the precise forecasting of ESF on a day-to-day basis is still far from reality.
S. Tulasi Ram, P. V. S. Rama Rao, D. S. V. V. D. Prasad, K. Niranjan, A. Raja Babu, R. Sridharan, C. V. Devasia, Sudha Ravindran   +7 more
doaj   +1 more source

Theoretical simulation of O⁺ and H⁺ densities in the Indian low latitude F-region and comparison with observations [PDF]

Annales Geophysicae, 2002
The O+ and H+ ion density distributions in the Indian low latitude F-region, within ± 15° magnetic latitudes, are simulated using a time dependent model developed on the basis of solution of the plasma continuity equation.
P. K. Bhuyan, P. K. Bhuyan, P. K. Kakoty, P. K. Kakoty, S. B. Singh   +4 more
doaj   +1 more source

Characterization and Climatological Modeling of Equatorial Ionization Anomaly (EIA) Crest Position

Journal of Geophysical Research: Space Physics, 2022
AbstractThe Equatorial Ionization Anomaly (EIA) is characterized by strong ionospheric gradients that complicate ionospheric modeling and mitigation of ionospheric impact on Global Navigation Satellite System applications. In this study, the variation of EIA crest locations as a function of longitude and solar radio flux index F10.7 has been derived ...
Nigussie, Melessew, Jakowski, Norbert, Hoque, Mohammed Mainul   +2 more
openaire   +2 more sources