Zobrazeno 1 - 10
of 24
pro vyhledávání: '"C. E. Valladares"'
Publikováno v:
Earth and Space Science, Vol 10, Iss 11, Pp n/a-n/a (2023)
Abstract The 14‐panel Advanced Modular Incoherent Scatter Radar (AMISR‐14) system deployed at Jicamarca observed equatorial spread F plumes on two consecutive nights under unfavorable seasonal and solar flux conditions during a period that can be
Externí odkaz:
https://doaj.org/article/da156924d50c4f4bad4a6e12cd2170e4
Autor:
E. R. de Paula, A. R. F. Martinon, A. O. Moraes, C. Carrano, A. C. Neto, P. Doherty, K. Groves, C. E. Valladares, G. Crowley, I. Azeem, A. Reynolds, D. M. Akos, T. Walter, T. L. Beach, J.‐M. Slewaegen
Publikováno v:
Earth and Space Science, Vol 8, Iss 2, Pp n/a-n/a (2021)
Abstract After sunset, in the equatorial regions ionospheric plasma irregularities are generated due to the generalized Rayleigh‐Taylor instability. Under favorable conditions these irregularities develop in the equatorial region while mapping alon
Externí odkaz:
https://doaj.org/article/39a5f79ed45649de82634ac5d0d1b1d4
Publikováno v:
Annales Geophysicae, Vol 33, Pp 1117-1133 (2015)
We present multi-instrumented measurements and multi-technique analysis of polar cap patches observed early during the recovery phase of the major magnetic storm of 20 November 2003 to investigate the origin of the polar cap patches. During this e
Externí odkaz:
https://doaj.org/article/6b39b30670ce48a3a07972760095bb32
Autor:
A. O. Akala, G. K. Seemala, P. H. Doherty, C. E. Valladares, C. S. Carrano, J. Espinoza, S. Oluyo
Publikováno v:
Annales Geophysicae, Vol 31, Pp 2085-2096 (2013)
GPS-TEC data were observed at the same local time at two equatorial stations on both longitudes: Lagos (6.52° N, 3.4° E, 3.04° S magnetic latitude), Nigeria; and Pucallpa (8.38° S, 74.57° W, 4.25° N magnetic latitude), Peru during the minim
Externí odkaz:
https://doaj.org/article/b09533fd997040d7b8d6c09355e140db
Autor:
V. V. Paznukhov, C. S. Carrano, P. H. Doherty, K. M. Groves, R. G. Caton, C. E. Valladares, G. K. Seemala, C. T. Bridgwood, J. Adeniyi, L. L. N. Amaeshi, B. Damtie, F. D'Ujanga Mutonyi, J. O. H. Ndeda, P. Baki, O. K. Obrou, B. Okere, G. M. Tsidu
Publikováno v:
Annales Geophysicae, Vol 30, Pp 675-682 (2012)
We report on the longitudinal, local time and seasonal occurrence of equatorial plasma bubbles (EPBs) and L band (GPS) scintillations over equatorial Africa. The measurements were made in 2010, as a first step toward establishing the climatology o
Externí odkaz:
https://doaj.org/article/531f54d21df449a88fd2526fdbff58c1
Autor:
C. E. Valladares, J. Villalobos, M. A. Hei, R. Sheehan, Su. Basu, E. MacKenzie, P. H. Doherty, V. H. Rios
Publikováno v:
Annales Geophysicae, Vol 27, Pp 1501-1508 (2009)
Measurements of total electron content (TEC) using 263 GPS receivers located in the North and South America continents are presented to demonstrate the simultaneous existence of traveling ionospheric disturbances (TID) at high, mid, and low latitu
Externí odkaz:
https://doaj.org/article/12010b8611004f88b52fb8b0279cedb8
Autor:
R. E. Sheehan, C. E. Valladares
Publikováno v:
Annales Geophysicae, Vol 22, Pp 3177-3193 (2004)
UHF scintillation measurements of zonal ionospheric drifts have been conducted at Ancon, Peru since 1994 using antennas spaced in the magnetic east-west direction to cross-correlate geo-synchronous satellite signals. An empirical model of average
Externí odkaz:
https://doaj.org/article/b4c1014146454a3eb5205b805ead6f60
Publikováno v:
Annales Geophysicae, Vol 22, Pp 3241-3250 (2004)
We describe the effect of the 6 November 2001 magnetic storm on the low latitude thermospheric composition. Daytime red line (OI 630.0nm) emissions from Carmen Alto, Chile showed anomalous 2-3 times larger emissions in the morning (05:30-08:30 Loc
Externí odkaz:
https://doaj.org/article/ef4daf0dcf2247399110163d4cb06c0e
Publikováno v:
Annales Geophysicae, Vol 22, Pp 3155-3175 (2004)
A latitudinal-distributed network of GPS receivers has been operating within Colombia, Peru and Chile with sufficient latitudinal span to measure the absolute total electron content (TEC) at both crests of the equatorial anomaly. The network also
Externí odkaz:
https://doaj.org/article/6dd409533f6e4828ac71fa8457402049
Publikováno v:
Annales Geophysicae, Vol 17, Pp 1020-1039 (1999)
We report important results of the first campaign specially designed to observe the formation and the initial convection of polar cap patches. The principal instrumentation used in the experiments comprised the EISCAT, the Sondrestrom, and the Sup
Externí odkaz:
https://doaj.org/article/7beb640b52cd41edb6458546a9720a53