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Found 18 entries in the Bibliography.
Showing entries from 1 through 18
2022 |
The influence of sudden stratospheric warming (SSW) on the ionosphere and ionospheric irregularities has been studied extensively over the years. However, majority of these Agyei-Yeboah, Ebenezer; Fagundes, Paulo; Tardelli, Alexandre; Pillat, Valdir; Vieira, Francisco; Arcanjo, Mateus; Published by: Advances in Space Research Published on: YEAR: 2022   DOI: 10.1016/j.asr.2022.08.065 |
2016 |
We studied the response of the ionosphere (F region) in the Brazilian sector during extreme space weather event of 17 March 2015 using a large network of 102 GPS- total electron content (TEC) stations. It is observed that the vertical total electron content (VTEC) was severely disturbed during the storm main and recovery phases. A wavelike oscillation with three peaks was observed in the TEC diurnal variation from equator to low latitudes during the storm main phase on 17\textendash18 March 2015. The latitudinal ... Fagundes, P.; Cardoso, F.; Fejer, B.; Venkatesh, K.; Ribeiro, B.; Pillat, V.; Published by: Journal of Geophysical Research: Space Physics Published on: 05/2016 YEAR: 2016   DOI: 10.1002/2015JA022214 |
2012 |
The main objective of the present investigation has been to compare the ionospheric parameters (NmF2 and hmF2) observed by two ground-based ionospheric sounders (one at PALMAS- located near the magnetic equator and the other at Sao Jose dos Campos-located in the low-latitude region) in the Brazilian sector with that by the satellite FORMOSAT-3/COSMIC radio occultation (RO) measurements during two geomagnetic storms which occurred in December 2006 and July 2009. It should be pointed out that in spite of increasing the lati ... Sahai, Y.; de Jesus, R.; Fagundes, P.R.; Selhorst, C.L.; de Abreu, A.J.; Ram, Tulasi; Aragon-Angel, A.; Pillat, V.G.; Abalde, J.R.; Lima, W.L.C.; Bittencourt, J.A.; Published by: Advances in Space Research Published on: 11/2012 YEAR: 2012   DOI: 10.1016/j.asr.2012.07.006 COSMIC satellite; F-region; geomagnetic storm; Ionosphere; Low solar activity |
This paper presents a study of thermospheric and ionospheric response to the 2008 minor sudden stratospheric warming (SSW) event. This period was characterized by low solar and geomagnetic activity. The study was performed using the Global Self-consistent Model of Thermosphere, Ionosphere, and Protonosphere (GSM TIP). Model results were compared with ionosonde data from Irkutsk, Kaliningrad, Sao Jose dos Campos, and Jicamarca. The SSW event was modeled by specifying the temperature and density perturbations at the lower b ... Korenkov, Y.; Klimenko, V.; Klimenko, M.; Bessarab, F.; Korenkova, N.; Ratovsky, K.; Chernigovskaya, M.; Shcherbakov, A.; Sahai, Y.; Fagundes, P.; de Jesus, R.; de Abreu, A.; Condor, P.; Published by: Journal of Geophysical Research Published on: 10/2012 YEAR: 2012   DOI: 10.1029/2012JA018018 Electric field; Ionosphere; sudden stratospheric warming; thermosphere |
2011 |
Sahai, Y.; Fagundes, P.; de Jesus, R.; de Abreu, A.; Crowley, G.; Kikuchi, T.; Huang, C.-S.; Pillat, V.; Guarnieri, F.; Abalde, J.; Bittencourt, J.; Published by: Annales Geophysicae Published on: Jan-01-2011 YEAR: 2011   DOI: 10.5194/angeo-29-919-2011 |
Sahai, Y; De Abreu, AJ; Fagundes, PR; De Jesus, R; Crowley, G; Klimenko, MV; Klimenko, VV; Brunini, C; Gende, M; Pillat, VG; , others; Published by: Asian Journal of Physics Published on: |
This study presents the Global Self-Consistent Model of the Thermosphere, Ionosphere and Protonosphere (GSM TIP) numerical simulations of the 9–14 September 2005 geomagnetic Klimenko, MV; Klimenko, VV; Ratovsky, KG; Goncharenko, LP; Sahai, Y; Fagundes, PR; De Jesus, R; De Abreu, AJ; Vesnin, AM; Published by: Radio Science Published on: |
2010 |
Sahai, Yogeshwar; de Jesus, Rodolfo; Fagundes, Paulo; de Abreu, Alessandro; Crowley, Geoff; Pillat, Valdir; Guede, Jose; Bittencourt, Jose; Published by: 38th COSPAR Scientific Assembly Published on: |
2009 |
Sahai, Y; Fagundes, PR; De Jesus, R; De Abreu, AJ; Crowley, G; Pillat, VG; Guarnieri, FL; , Abalde; Bittencourt, JA; Published by: Published on: |
Sahai, Y; Becker-Guedes, F; Fagundes, PR; De Jesus, R; De Abreu, AJ; Paxton, LJ; Goncharenko, LP; Brunini, C; Gende, M; Ferreira, AS; , others; Published by: Journal of Geophysical Research: Space Physics Published on: |
2008 |
Sahai, Y.; Becker-Guedes, F.; Fagundes, P.R.; Lima, W.L.C.; de Abreu, A.J.; Guarnieri, F.L.; Candido, C.M.N.; Pillat, V.G.; Published by: Published on: |
2007 |
Brazilian ionosphere behavior during an intense solar flare The 28 October 2003 solar flare was one of the most intense solar flares observed in the recent past. In the present investigation we show the ionospheric effects observed in the Becker-Guedes, F; Sahai, Y; Fagundes, PR; Abreu, A; Pillat, VG; Lima, WLC; Published by: Published on: YEAR: 2007   DOI: https://doi.org/10.3997/2214-4609-pdb.172.SBGF0393_07 |
Sahai, Y; Becker-Guedes, F; Fagundes, PR; Lima, WLC; De Abreu, AJ; Guarnieri, FL; Candido, CMN; Pillat, VG; Published by: Published on: |
Becker-Guedes, F; Sahai, Y; Fagundes, PR; Espinoza, ES; Pillat, VG; Lima, WLC; Basu, Su; Basu, Sa; Otsuka, Y; Shiokawa, K; MacKenzie, E.; Bittencourt, J.; Published by: Published on: |
2006 |
Becker-Guedes, F; Sahai, Y; Fagundes, P; Crowley, G; Lima, W; Published by: Published on: |
2005 |
Sahai, Y; Fagundes, PR; Becker-Guedes, F; Bolzan, MJA; , Abalde; Pillat, VG; De Jesus, R; Lima, WLC; Crowley, G; Shiokawa, K; , others; Published by: Journal of Geophysical Research: Space Physics Published on: |
2004 |
Response of the equatorial and low-latitude ionosphere during the space weather events of April 2002
Lima, WLC; Becker-Guedes, F; Sahai, Y; Fagundes, PR; , Abalde; Crowley, G; Bittencourt, JA; Published by: Published on: |
Sahai, Y; Fagundes, PR; Becker-Guedes, F; , Abalde; Crowley, G; Pi, X; Igarashi, K; Amarante, GM; Pimenta, AA; Bittencourt, JA; Published by: Published on: |
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