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    • Abdu, M. A. (18)
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Mostrando 10 de un total de 18 resultados de la colección: Artículos Científicos. (0.144 segundos)

Mostrando ítems 1-10 de 18

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      Por | Mannucci, A. J.; Tsurutani, B. T.; Abdu, M. A.; Gonzalez, W. D.; Komjathy, A.; Echer, E.; Iijima, B. A.; Crowley, G.; Anderson, D. (American Geophysical Union, 2008-07-09)
      Superposed epoch analysis of the dayside ionospheric response to four intense geomagnetic storms 
      Prompt daytime ionospheric responses are presented for the following four intense geomagnetic storms: 29 October 2003, 30 October 2003, 20 November 2003, and 7 November 2004. We perform a superposed epoch analysis of the storms by defining the start time of the epoch when the Kan‐Lee interplanetary ...
        Palabras claves:
      • Solar wind
      • Magnetosphere‐ionosphere coupling
      • Global ionospheric storms
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      Por | Szuszczewicz, E. P.; Fejer, B. Q.; Roelof, E. C.; Schunk, R. W.; Leitinger, R.; Abdu, M. A.; Reddy, B. M.; Joselyn, J. C.; Wilkinson, P.; Woodman Pollitt, Ronald Francisco; Wolf, R. A. (European Geosciences Union, 1988-01-01)
      Sundial: A world-wide study of interactive ionospheric processes and their roles in the transfer of energy and mass in the sunearth system 
      During the period 5-13 October 1984 a coordinated solar-terrestrial data base was acquired to develop a comprehensive understanding and an associated predictive capability for the cause-effect relationships which control the global-scale ionosphere. The effort, the first in a series of continuing ...
        Palabras claves:
      • Ionosphere
      • Magnetosphere
      • Geomagnetism
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      Por | Santos, A. M.; Abdu, M. A.; Souza, J. R.; Sobral, J. H. A.; Batista, I. S. (American Geophysical Union, 2016-02-11)
      Disturbance zonal and vertical plasma drifts in the Peruvian sector during solar minimum phases 
      In the present work, we investigate the behavior of the equatorial F region zonal plasma drifts over the Peruvian region under magnetically disturbed conditions during two solar minimum epochs, one of them being the recent prolonged solar activity minimum. The study utilizes the vertical and zonal ...
        Palabras claves:
      • Electric field
      • Ionospheric drifts
      • Magnetic storms
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      Por | Fejer, B. G.; Kelley, M. C.; Senior, C.; De la Beaujardiere, O.; Holt, J. A.; Tepley, C. A.; Burnside, R.; Abdu, M. A.; Sobral, J. H. A.; Woodman Pollitt, Ronald Francisco; Kamide, Y.; Lepping, R. (American Geophysical Union, 1990-03)
      Low‐ and mid‐latitude ionospheric electric fields during the January 1984 GISMOS Campaign 
      An alternative approach for estimating E region density profiles using radio occultation total electron content (ROTEC) measurements is presented. In this approach, the F region contribution to the measured ROTEC is removed using the estimated F region from an assimilative model of ionospheric density. ...
        Palabras claves:
      • Ionosphere
      • Electric fields
      • F Region
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      Por | Nogueira, P. A. B.; Souza, J. R.; Abdu, M. A.; Paes, R. R.; Sousasantos, J.; Marques, M. S.; Bailey, G. J.; Denardini, C. M.; Batista, I. S.; Takahashi, H.; Cueva, R. Y. C.; Chen, S. S. (American Geophysical Union, 2015-03-11)
      Modeling the equatorial and low‐latitude ionospheric response to an intense X‐class solar flare 
      We have investigated the ionospheric response close to the subsolar point in South America due to the strong solar flare (X2.8) that occurred on 13 May 2013. The present work discusses the sudden disturbances in the D region in the form of high‐frequency radio wave blackout recorded in ionograms, the ...
        Palabras claves:
      • Ionospheric response to solar flare
      • TEC disturbance
      • Ionospheric modeling
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      Por | Abdu, M. A.; Nogueira, P. A. B.; Souza, J. R.; Batista, I. S.; Dutra, S. L. G.; Sobral, J. H. A. (American Geophysical Union, 2017-01-12)
      Equatorial electrojet responses to intense solar flares under geomagnetic disturbance time electric fields 
      Large enhancement in the equatorial electrojet (EEJ) current can occur due to sudden increase in the E layer density arising from solar flare associated ionizing radiations, as also from background electric fields modified by magnetospheric disturbances when present before or during a solar flare. We ...
        Palabras claves:
      • Solar flare
      • Overshielding electric field
      • Equatorial electrojet
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      Por | Abdu, M. A.; Souza, J. R.; Batista, I. S.; Fejer, B. G.; Sobral, J. H. A. (American Geophysical Union, 2013-04-11)
      Sporadic E layer development and disruption at low latitudes by prompt penetration electric fields during magnetic storms 
      An investigation of low‐latitude sporadic E layers during magnetic storms shows that the formation and disruption of these layers are strongly controlled by the magnetospheric electric fields that penetrate to equatorial ionosphere. It is observed that a prompt penetration electric field (PPEF) of ...
        Palabras claves:
      • Equatorial ionosphere
      • Sporadic E layer
      • Penetration electric fields
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      Por | Rastogi, R. G.; Chandra, H.; Condori, Louis; Abdu, M. A.; Reinisch, B.; Tsunoda, R. T.; Prasad, D. S. V. V. D.; Pant, T. K.; Maruyama, T. (Springer Verlag, 2012-10)
      Abnormally large magnetospheric electric field on 9 November 2004 and its effect on equatorial ionosphere around the world 
      There was a solar event around 1850 UT on 9th November 2004, associated with an abnormally large solar wind flow pressure and large southward interplanetary magnetic field, causing an abnormally large prompt penetration electric field between 1850 and 2100 UT. Abnormally large vertical F-region drifts ...
        Palabras claves:
      • Equatorial ionosphere
      • Space weather
      • Geomagnetic storm
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      Por | Abdu, M. A.; Reddy, B.M.; Walker, G. O.; Hanbaba, R.; Fejer, B.G.; Woodman Pollitt, Ronald Francisco; Schunk, R.W.; Szuszczewicz, E.P. (European Geosciences Union, 1987-04)
      Processes in the quiet and disturbed equatorial-low latitude ionosphere: Sundial campaign, 1984 
      A network of ionospheric diagnostic instruments was operated on a world wide basis during the October 5-13. 1984 SUNDIAL campaign. The network provided a unique opportunity for a truly multiple technique global analysis of the equatorial-low latitude ionospheric behavior during the campaign period. ...
        Palabras claves:
      • Ionosphere
      • Electric fields
      • Winds
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      Por | Santos, A. M.; Abdu, M. A.; Souza, J. R.; Sobral, J. H. A.; Batista, I. S.; Denardini, C. M. (American Geophysical Union, 2016-05-18)
      Storm time equatorial plasma bubble zonal drift reversal due to disturbance Hall electric field over the Brazilian region 
      The dynamics of equatorial ionospheric plasma bubbles over Brazilian sector during two magnetic storm events are investigated in this work. The observations were made at varying phases of magnetic disturbances when the bubble zonal drift velocity was found to reverse westward from its normally eastward ...
        Palabras claves:
      • Equatorial plasma bubble
      • Ionospheric irregularities
      • Particle precipitation
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