Zobrazeno 1 - 10
of 70
pro vyhledávání: '"A. J. de Abreu"'
Low-latitude equinoctial spread-F occurrence at different longitude sectors under low solar activity
Autor:
M. Pezzopane, E. Zuccheretti, P. Abadi, A. J. de Abreu, R. de Jesus, P. R. Fagundes, P. Supnithi, S. Rungraengwajiake, T. Nagatsuma, T. Tsugawa, M. A. Cabrera, R. G. Ezquer
Publikováno v:
Annales Geophysicae, Vol 31, Pp 153-162 (2013)
We present the results of a comparative study of spread-F signatures over five low-latitude sites: Chiangmai (CGM; 18.8° N, 98.9° E, mag. Lat. 8.8° N), Thailand; Tanjungsari (TNJ; 6.9° S, 107.6° E, mag. Lat. 16.9° S), Indonesia; Palmas (PAL;
Externí odkaz:
https://doaj.org/article/cbaafc7c30504da68a2f682bab903fc3
Autor:
Y. Sahai, P. R. Fagundes, R. de Jesus, A. J. de Abreu, G. Crowley, T. Kikuchi, C.-S. Huang, V. G. Pillat, F. L. Guarnieri, J. R. Abalde, J. A. Bittencourt
Publikováno v:
Annales Geophysicae, Vol 29, Pp 919-929 (2011)
In the present investigation, we have studied the response of the ionospheric F-region in the Latin American sector during the intense geomagnetic storm of 21–22 January 2005. This geomagnetic storm has been considered "anomalous" (minimum Dst r
Externí odkaz:
https://doaj.org/article/058937468705456cbb46202b8ac1cfec
Autor:
Y. Sahai, F. Becker-Guedes, P. R. Fagundes, W. L. C. Lima, A. J. de Abreu, F. L. Guarnieri, C. M. N. Candido, V. G. Pillat
Publikováno v:
Annales Geophysicae, Vol 25, Pp 2497-2502 (2007)
The 28 October 2003 solar flare (X-ray Class X17.2) was one of the most intense solar flares observed in the recent past. In the present investigation we show the unusual ionospheric effects observed in the Brazilian sector during this solar flare
Externí odkaz:
https://doaj.org/article/7f03b4eb89384f6cbe8c9a44cca8ae01
Autor:
Alessio Pignalberi, Francisco Vieira, G. K. Seemala, Paulo Roberto Fagundes, M. O. Arcanjo, A. J. de Abreu, Brunno Augusto Ribeiro, Valdir Gil Pillat, Jean-Pierre Raulin, Michael Pezzopane, A. Tardelli, Maurício Araújo Dias, K. Venkatesh, Clezio Marcos Denardini, Maurício José Alves Bolzan, John Bosco Habarulema
Publikováno v:
Advances in Space Research. 66:1775-1791
On September 6, 2017, the solar active region AR 2673 emitted two solar flares: the first at 08:57 UT (X2.2) and the second at 11:53 UT (X9.3); both were powerful enough to black-out high and low frequency radio waves (where UT is universal time). Th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d34daa00ff6c87676c8c3cc62137d9c3
https://doi.org/10.1016/j.asr.2020.06.032
https://doi.org/10.1016/j.asr.2020.06.032
Autor:
Paulo Roberto Fagundes, R. de Jesus, Mauricio Gende, K. Venkatesh, Inácio M. Martin, J.R. Abalde, M. Roberto, Mauro A. Alves, A. J. de Abreu, P. A. B. Nogueira
Publikováno v:
Advances in Space Research. 63:3586-3605
In this investigation, we present and discuss the effects of 6 X2-class solar flare events in the ionospheric F region over Brazilian sector that occurred during 2013 to 2015. For this investigation, we present the vertical total electron content (VT
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::09f42469e2a3316f3009f9417d65094b
https://doi.org/10.1016/j.asr.2019.02.020
https://doi.org/10.1016/j.asr.2019.02.020
Autor:
H. Takahashi, C. A. O. B. Figueiredo, D. Barros, K. Venkatesh, A. J. de Abreu, Paulo Roberto Fagundes, E. R. de Paula, O. F. Jonah, I. S. Batista, R. de Jesus
Publikováno v:
Journal of Geophysical Research: Space Physics. 125
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::37988e16db36554134a2d3670c2b1eac
https://doi.org/10.1029/2019ja027441
https://doi.org/10.1029/2019ja027441
Autor:
Clezio Marcos Denardini, R. de Jesus, K. Venkatesh, Paulo Roberto Fagundes, A. J. de Abreu, I. S. Batista
Publikováno v:
Journal of Atmospheric and Solar-Terrestrial Physics. :78-89
In this paper, the effects of a minor sudden stratospheric warming (SSW) event of 2012 in the ionosphere over South American and African sectors have been studied using C/NOFS satellite data and GPS observations. Also, the magnetometer measurements o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e242136c458f8337fa74e155fd9b1755
https://doi.org/10.1016/j.jastp.2017.04.003
https://doi.org/10.1016/j.jastp.2017.04.003
Publikováno v:
Journal of Atmospheric and Solar-Terrestrial Physics. 154:92-103
The main purpose of this paper is to study the response of the ionospheric F-region using GPS-TEC measurements at equatorial and low latitude regions over the Brazilian sector during an sudden stratospheric warming (SSW) event in the year 2006. In th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6c22544f685204436f6c88243a2c48dd
https://doi.org/10.1016/j.jastp.2016.12.005
https://doi.org/10.1016/j.jastp.2016.12.005
Publikováno v:
Journal of Atmospheric and Solar-Terrestrial Physics. 147:126-137
The present case study reports the unusual noon-time electron density bite-out events during 12th–18th April 2004 around the anomaly crest locations which are not observed over the geomagnetic equator. These bite-out events at the crest locations o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bcb8a184f8adb5b8db5359af0ab428b2
https://doi.org/10.1016/j.jastp.2016.07.016
https://doi.org/10.1016/j.jastp.2016.07.016
Publikováno v:
Transportation Letters. 8:13-25
This work addresses the behavior and cognitive problems associated with stated preference surveys, more specifically respondents' disengagement. The paper provides an extensive introduction and literature review, and the analysis of the extent of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a2dea987e975382f10e83531bebe9844
https://doi.org/10.1179/1942787515y.0000000003
https://doi.org/10.1179/1942787515y.0000000003