Zobrazeno 1 - 10
of 60
pro vyhledávání: '"P. R. Fagundes"'
Autor:
P. A. Fontes, M. T. D. A. H. Muella, L. C. A. Resende, V. F. Andrioli, P. R. Fagundes, V. G. Pillat, P. P. Batista, A. J. Carrasco
Publikováno v:
Annales Geophysicae, Vol 41, Pp 209-224 (2023)
Sporadic E (Es) layers are patches of high ionization observed at around 100–140 km height in the E region. Their formation at low latitudes is primarily associated with the diurnal and semidiurnal components of the tidal winds via the ion converge
Externí odkaz:
https://doaj.org/article/33c53cf8ced84c1bacc2e0eb1c73c16c
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
Publikováno v:
Annales Geophysicae, Vol 31, Pp 127-133 (2013)
This paper analyses the multifractal aspects of the GPS data (measured during a period of low solar activity) obtained from two Brazilian stations: Belém (01.3° S, 48.3° W) and São José dos Campos (SJC) (23.2° S, 45.9° W). The results show
Externí odkaz:
https://doaj.org/article/271ed6ab39de4491b2a6a4dffbe0de19
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
Publikováno v:
Annales Geophysicae, Vol 25, Pp 2371-2392 (2007)
A realistic fully time-dependent computer model, denominated LION (Low-latitude Ionospheric) model, that simulates the dynamic behavior of the low-latitude ionosphere is presented. The time evolution and spatial distribution of the ionospheric par
Externí odkaz:
https://doaj.org/article/460e55a634ab414ebe077ab70e98316c
Autor:
F. Becker-Guedes, Y. Sahai, P. R. Fagundes, E. S. Espinoza, V. G. Pillat, W. L. C. Lima, Su. Basu, Sa. Basu, Y. Otsuka, K. Shiokawa, E. M. MacKenzie, X. Pi, J. A. Bittencourt
Publikováno v:
Annales Geophysicae, Vol 25, Pp 863-873 (2007)
A very intense geomagnetic storm (superstorm) began with storm sudden commencement (SSC) at 08:03 UT on 20 November 2003, as a result of the coronal mass ejection (CME) by sunspot 484 hurled into space on 18 November 2003. The geomagnetic storm at
Externí odkaz:
https://doaj.org/article/3231957637ce46bc84e36b57928e8d3b
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:
M. J. Nicolls, M. C. Kelley, M. N. Vlasov, Y. Sahai, J. L. Chau, D. L. Hysell, P. R. Fagundes, F. Becker-Guedes, W. L. C. Lima
Publikováno v:
Annales Geophysicae, Vol 24, Pp 1317-1331 (2006)
We report here on post-midnight uplifts near the magnetic equator. We present observational evidence from digital ionosondes in Brazil, a digisonde in Peru, and other measurements at the Jicamarca Radio Observatory that show that these uplifts occ
Externí odkaz:
https://doaj.org/article/b4cd5fa113ab4923b0afcd6d39c76a79
Response of the equatorial and low-latitude ionosphere during the space weather events of April 2002
Autor:
W. L. C. Lima, F. Becker-Guedes, Y. Sahai, P. R. Fagundes, J. R. Abalde, G. Crowley, J. A. Bittencourt
Publikováno v:
Annales Geophysicae, Vol 22, Pp 3211-3219 (2004)
A digital ionosonde, of the type known as Canadian Advanced Digital Ionosonde (CADI), has been in routine operation at São José dos Campos (23.2° S, 45.9° W; dip latitude 17.6° S), Brazil, since August 2000. A new CADI was installed at Palmas
Externí odkaz:
https://doaj.org/article/ea1018be16ae46299e3996b52488f639
Autor:
Y. Sahai, P. R. Fagundes, F. Becker-Guedes, J. R. Abalde, G. Crowley, X. Pi, K. Igarashi, G. M. Amarante, A. A. Pimenta, J. A. Bittencourt
Publikováno v:
Annales Geophysicae, Vol 22, Pp 3221-3229 (2004)
A new ionospheric sounding station using a Canadian Advanced Digital Ionosonde (CADI) was established for routine measurements by the "Universidade do Vale do Paraiba (UNIVAP)" at São José dos Campos (23.2° S, 45.9° W), Brazil, in August 2000.
Externí odkaz:
https://doaj.org/article/d83e621deab849cda531adf7739987c5