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    • Woodman Pollitt, Ronald Francisco (78)
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Mostrando 10 de un total de 226 resultados de la colección: Artículos Científicos. (0.117 segundos)

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      Por | Yizengaw, E.; Moldwin, M. B.; Zesta, E.; Biouele, C. M.; Damtie, B.; Mebrahtu, A.; Rabiu, B.; Valladares, C. F.; Stoneback, R. (European Geosciences Union (EGU), 2014-03-13)
      The longitudinal variability of equatorial electrojet and vertical drift velocity in the African and American sectors 
      While the formation of equatorial electrojet (EEJ) and its temporal variation is believed to be fairly well understood, the longitudinal variability at all local times is still unknown. This paper presents a case and statistical study of the longitudinal variability of dayside EEJ for all local times ...
        Palabras claves:
      • Ionosphere
      • Equatorial ionosphere
      • Ionospheric irregularities
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      Por | Rodrigues, F. S.; De Paula, E. R.; Chau Chong Shing, Jorge Luis (European Geosciences Union (EGU), 2011-10-28)
      On the characteristics of 150-km echoes observed in the Brazilian longitude sector by the 30 MHz São Luís radar 
      We present long-overdue details about the intensity and spectral characteristics of 150-km echoes observed by the Sao Lu ıs radar in Brazil. The Sao Lu ıs observations show that the echoes usually come from multiple scattering layers that descend in altitude before local noon, and ascend during afternoon ...
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      • Ionosphere
      • Equatorial ionosphere
      • Radar
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      Por | Kudeki, Erhan; Woodman Pollitt, Ronald Francisco; Feng, Zhaomei (American Geophysical Union, 2003)
      Incoherent scatter radar plasma density measurements at Jicamarca using a transverse-mode differential-phase method 
      The 50 MHz Jicamarca incoherent scatter radar can be used to make very high precision F-region plasma drift measurements with less than a m/s uncertainty and 5 min/ 15 km time/height resolutions. In such measurements the transmitting antenna beam is pointed perpendicular to the geomagnetic field ~ B ...
        Palabras claves:
      • Incoherent scattering radar
      • Plasma density
      • Measurement
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      Por | Bhattacharyya, Archana; Chau Chong Shing, Jorge Luis; Denardini, Clezio M.; Hysell, David L.; Makela, Jonathan J.; Shiokawa, Kazuo; Kudeki, Erhan (Elsevier, 2013-10)
      Recent advances in equatorial, low- and mid-latitude aeronomy 
      This special issue of the Journal of Atmospheric and Solar–Terrestrial Physics on “Recent Advances in Equatorial, Low- and Mid-latitude Aeronomy” contains selected papers presented at the 13th International Symposium on Equatorial Aeronomy (ISEA13). This symposium is the latest in a long series of ...
        Palabras claves:
      • Ionosphere
      • Equatorial electrojet
      • Upper atmosphere
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      Por | Woodman Pollitt, Ronald Francisco (European Geosciences Union (EGU), 2009-05-04)
      Spread F - an old equatorial aeronomy problem finally resolved? 
      One of the oldest scientific topics in Equatorial Aeronomy is related to Spread-F. It includes all our efforts to understand the physical mechanisms responsible for the existence of ionospheric F-region irregularities, the spread of the traces in a night-time equatorial ionogram – hence its name – and ...
        Palabras claves:
      • F Region
      • Ionosphere
      • Propagation of ionospheric radio waves
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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 ...
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      • Ionosphere
      • Polar regions
      • Magnetic storms
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      Por | Pedatella, N. M.; Fang, T.-W.; Jin, H.; Sassi, F.; Schmidt, H.; Chau Chong Shing, Jorge Luis; Siddiqui, T. A.; Goncharenko, L. (American Geophysical Union, 2016-07-18)
      Multimodel comparison of the ionosphere variability during the 2009 sudden stratosphere warming 
      A comparison of different model simulations of the ionosphere variability during the 2009 sudden stratosphere warming (SSW) is presented. The focus is on the equatorial and low‐latitude ionosphere simulated by the Ground‐to‐topside model of the Atmosphere and Ionosphere for Aeronomy (GAIA), Whole ...
        Palabras claves:
      • Ionosphere
      • Sudden stratosphere warming
      • Radar
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      Por | Hysell, D. L.; Baumgarten, Y.; Milla, Marco; Valdez, A.; Kuyeng, K. (American Geophysical Union, 2018-08-14)
      Ionospheric Specification and Space Weather Forecasting With an HF Beacon Network in the Peruvian Sector 
      A network of high‐frequency (HF) transmitters and receivers used for ionospheric specification is being installed in Peru. The HF transmitters employ multiple frequencies and binary phase coding with pseudorandom noise, and the observables provided by the receivers include group delay, Doppler shift, ...
        Palabras claves:
      • Radio
      • Beacon
      • Ionosphere
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      Por | Balsley, B. B; Carter, D. A.; Woodman Pollitt, Ronald Francisco (American Geophysical Union, 1976-03-01)
      Vertical ionization drifts in the lower equatorial ionosphere and the meridional current systems 
      Recent radar observations near the magnetic equator show that the electron vertical drift velocity below 200 km is upward during the day and downward at night, in agreement with measurements made at higher heights. The electron vertical drifts are consistent with meridional current theories. According ...
        Palabras claves:
      • Radar
      • Ionosphere
      • Electrons
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      Por | Nicolls, M. J.; Kelley, M. C.; Vlasov, M. N.; Sahai, Y.; Chau Chong Shing, Jorge Luis; Hysell, D. L.; Fagundes, P. R.; Becker-Guedes, F.; Lima, W. L. C. (European Geosciences Union (EGU), 2006-07-03)
      Observations and modeling of post-midnight uplifts near the magnetic equator 
      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 occur fairly regularly in the post-midnight period, raising ...
        Palabras claves:
      • Ionosphere
      • Equatorial ionosphere
      • Modeling and forecasting
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