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    • Woodman Pollitt, Ronald Francisco (12)
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Mostrando 10 de un total de 33 resultados de la colección: Artículos Científicos. (0.109 segundos)

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      Por | Bioni, M.A.; Fejer, B.; Woodman Pollitt, Ronald Francisco; Meriwether Jr., J. W. (Elsevier, 1988)
      Measurements of the dynamics and coupling of the equatorial thermosphere and the F-region ionosphere in Peru 
      Simultaneous Fabry-Perot Interferometer (FPI) and Incoherent Scatter Radar (ISR) observations from Arequipa and Jicamarca, Peru, respectively, were obtained on 24 and 25 September 1986, during which there was substantial geomagnetic activity. Comparison of the neutral thermosphere's zonal velocity ...
        Palabras claves:
      • Ionosphere
      • Thermosphere
      • Interferometers
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      Por | Malhotra, Akshay; Mathews, John D. (American Geophysical Union, 2009-11-12)
      Low‐altitude meteor trail echoes 
      We present here the first observations of a new type of meteor echo. These Low‐Altitude Trail Echoes (LATE), observed almost exclusively below 90 km altitude using the Jicamarca Research Observatory 50 MHz radar, exhibit very different features and characteristics from the other well studied and ...
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      • Echo sounding
      • Meteor
      • Observatory
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      Por | Kelley, M; Larsen, M; La Hoz, C; McClure, J (American Geophysical Union, 1981-10-01)
      Gravity wave initiation of equatorial Spread F: A case study 
      Jicamarca radar backscatter maps were made during four consecutive nights in March 1979. Two of these maps displayed single towering plumes extending to nearly 1000-km altitude. On a third night, discussed in detail here, six plumes were generated in clear association with a nearly sinusoidal oscillation ...
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      • Gravitational waves
      • Plasma
      • Electric fields
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      Por | Wilson, Mark (American Institute of Physics, 2009-06-01)
      Meteor trails track upper atmospheric winds 
      Meers Oppenheim and his colleagues from Boston University, Peru's Jicamarca Radio Observatory (JRO), and Los Alamos National Laboratory now offer an alternative approach that has its origins in another 50-year-old technique. Free electrons produced in the plasma trails of incoming meteors make an ideal ...
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      • Meteors
      • Ionosphere
      • Radar
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      Por | Pavlov, A. V. (European Geosciences Union (EGU), 2006-10-20)
      The role of the zonal ExB plasma drift in the low-latitude ionosphere at high solar activity near equinox from a new three-dimensional theoretical model 
      A new three-dimensional, time-dependent theoretical model of the Earth's low and middle latitude ionosphere and plasmasphere has been developed, to take into account the effects of the zonal E×B plasma drift on the electron and ion number densities and temperatures, where E and B are the electric and ...
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      • Ionosphere
      • Plasma
      • Electric fields
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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 ...
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      • Equatorial ionosphere
      • Ionosphere
      • Scintillation
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      Por | Chau Chong Shing, Jorge Luis; Woodman Pollitt, Ronald Francisco (American Geophysical Union, 2001)
      Interferometric and dual beam observations of daytime spread-F-like irregularities over Jicamarca 
      We report new observations made on April 11 2000 over Jicamarca of daytime spread-F-like irregularities. These irregularities are extremely rare (this was the fourth observation in the history of Jicamarca) and were first reported by Woodman et al. [1985]. The main features of these new observations, ...
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      • Interferometry
      • F Region
      • Plasma
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      Por | Fejer, J.A.; Ierkic, H.M.; Woodman Pollitt, Ronald Francisco; Röttger, J.; Sulzer, M.; Behnke, R.A.; Veldhuis, A. (American Geophysical Union, 1982)
      Observations of the HF-enhanced plasma line with a 46.8MHz radar and reinterpretation of previous observations with the 430 MHZ radar 
      During 5.1 MHz HF transmissions below the F-region penetration frequency by a nearby ionospheric modification facility, radar echoes coming from F-region heights at a frequency of 46.8 + 5.1 = 51.9 MHz were received while a VHF radar using the 305 m spherical reflector at Arecibo was transmitting ...
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      • Radar
      • Ionosphere
      • Echoes
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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. ...
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      • Ionosphere
      • Electric fields
      • F Region
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      Por | Fejer, B. G.; De Paula, E. R.; Batista, I. S.; Bonelli, E.; Woodman Pollitt, Ronald Francisco (American Geophysical Union, 1989-09-01)
      Equatorial F region vertical plasma drifts during solar maxima 
      Incoherent scatter radar measurements at Jicamarca are used to study the effects of large solar fluxes and magnetic activity on the F region vertical plasma drifts. The average drifts from the two last solar maxima are almost identical except in the late afternoon-early evening sector where their ...
        Palabras claves:
      • F region
      • Plasma
      • Solar activity
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