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    • Valladares, C. E. (28)
    • Sheehan, R. (8)
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    • Groves, K. M. (6)
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Mostrando 10 de un total de 28 resultados de la colección: Artículos Científicos. (0.134 segundos)

Mostrando ítems 1-10 de 28

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      Por | Valladares, C. E.; Pedersen, T.; Sheehan, R. (European Geosciences Union, 2015-09-14)
      Polar cap patches observed during the magnetic storm of November 2003: observations and modeling 
      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 event, the Qaanaaq imager observed elongated polar cap ...
        Palabras claves:
      • Ionosphere
      • Polar regions
      • Magnetic storms
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      Por | Basu, B.; Retterer, J. M.; De La Beaujardiére, O.; Valladares, C. E.; Kudeki, E. (American Geophysical Union, 2004-02-11)
      Theoretical relationship between maximum value of the post-sunset drift velocity and peak-to-valley ratio of anomaly TEC 
      Theoretical study of electron density distribution in the nighttime equatorial ionosphere shows that linear relationships with statistically significant correlation coefficients exist between the maximum value of the post‐sunset plasma drift velocity and the peak‐to‐valley ratio of anomaly TEC. The ...
        Palabras claves:
      • Nighttime equatorial anomaly
      • TEC
      • Post‐sunset drift velocity
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      Por | Valladares, C. E.; Basu, S.; Groves, K.; Hagan, M. P.; Hysell, D.; Mazella Jr., A. J.; Sheehan, R. E. (American Geophysical Union, 2001-12)
      Measurements of the latitudinal distributions of total electron content during equatorial spread F events 
      We have constructed latitudinal profiles of the total electron content (TEC) using measurements from six GPS receivers conducted during 1998. The TEC profiles have been divided into two groups: One corresponds to days when plumes or equatorial spread F (ESF) develops, and the second group portrays ...
        Palabras claves:
      • Ionosphere
      • Electrons
      • F Region
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      Por | Basu, S.; Basu, Su.; MacKenzie, E.; Bridgwood, C.; Valladares, C. E.; Groves, K. M.; Carrano, C. (American Geophysical Union, 2010-10-05)
      Specification of the occurrence of equatorial ionospheric scintillations during the main phase of large magnetic storms within solar cycle 23 
      Satellite communication and navigation systems operating at low latitudes suffer outages due to ionospheric scintillations during large magnetic storms that are not currently specified by any model. This paper describes and demonstrates how in the framework of an eastward electric field penetration ...
        Palabras claves:
      • Equatorial ionosphere
      • Ionosphere
      • Scintillation
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      Por | Valladares, C. E.; Meriwether, J. W.; Sheehan, R.; Biondi, M. A. (American Geophysical Union, 2002-07-18)
      Correlative study of neutral winds and scintillation drifts measured near the magnetic equator 
      Measurements of the thermospheric neutral wind at Arequipa, Peru, and observations of the drift of the irregularities at Ancon, Peru, are used to study the coupling that exists between ions and neutrals at equatorial latitudes and the variability of this coupling as a function of the occurrence of ...
        Palabras claves:
      • Scintillations
      • Thermospheric wind
      • Irregularity drift
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      Por | Akala, A. O.; Doherty, P. H.; Carrano, C. S.; Valladares, C. E.; Groves, K. M. (American Geophysical Union, 2012-07-25)
      Impacts of ionospheric scintillations on GPS receivers intended for equatorial aviation applications 
      This study examines the impacts of ionospheric scintillations on GPS receivers that are intended for equatorial or transequatorial aviation applications. We analyzed GPS data that were acquired at Ascension Island during the Air Force Research Laboratory (AFRL) campaign of the solar maximum year of ...
        Palabras claves:
      • Aviation
      • Ionospheric scintillations
      • GPS
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      Por | McNamara, L. F.; Cooke, D. L.; Valladares, C. E.; Reinisch, B. W. (American Geophysical Union, 2007-03-13)
      Comparison of CHAMP and Digisonde plasma frequencies at Jicamarca, Peru 
      Ionospheric plasma frequencies at the altitude of the CHAMP satellite have been deduced from ionosonde true‐height profiles for Jicamarca, Peru, and have been compared with the in situ measurements made by CHAMP. The differences between the plasma frequencies have been found to be well within the ...
        Palabras claves:
      • Plasma frequency
      • CHAMP satellite
      • Digisonde
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      Por | Laskar, F. I.; Eastes, R. W.; Martinis, C. R.; Daniell, R. E.; Pedatella, N. M.; Burns, A. G.; McClintock, W.; Goncharenko, L. P.; Coster, A.; Milla, Marco; Wang, W.; Valladares, C. E.; Codrescu, M. V. (American Geophysical Union, 2020-07)
      Early morning equatorial ionization anomaly from GOLD observations 
      During geomagnetically quiet and solar minimum conditions, spatial variations of the early morning thermosphere‐ionosphere (TI) system are expected to be mainly governed by wave dynamics. To study the postmidnight dynamical coupling, we investigated the early morning equatorial ionization anomaly (EIA) ...
        Palabras claves:
      • Airglow
      • Total electron content
      • Thermosphere‐ionosphere dynamics
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      Por | Shume, E. B.; Mannucci, A. J.; Butala, M. D.; Pi, X.; Valladares, C. E. (American Geophysical Union, 2013-04-23)
      Flux tube analysis of L‐band ionospheric scintillation 
      This manuscript presents magnetic flux tube analysis of L‐band signal scintillation in the nighttime equatorial and low‐latitude ionosphere. Residues of the scintillation index urn:x wiley:jgra:media:jgra50285:jgra50285-math-0001 estimated from the L‐band signals received from Geostationary Earth Orbit ...
        Palabras claves:
      • Equatorial and low latitude ionosphere
      • Ionospheric irregularities
      • Scintillation
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      Por | Yizengaw, E.; Moldwin, M. B.; Mebrahtu, A.; Damtie, B.; Zesta, E.; Valladares, C. E.; Doherty, P. (Elsevier, 2010-08-12)
      Comparison of storm time equatorial ionospheric electrodynamics in the African and American sectors 
      The characteristics of storm time (corotating interaction regions (CIR)-driven storm that happened on 9 August 2008) equatorial electrojet (EEJ) phenomena and their effect on the ionospheric density structure at two different longitudinal sectors are presented. Equatorial magnetometer data, occultation ...
        Palabras claves:
      • Equatorial Electrojet
      • Equatorial ionosphere
      • Electric fields
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