Repositorio Digital del IGP

Listar por título

Ordenar por:Orden:Resultados:

  • Liu, Jing; Liu, Libo; Nakamura, Takuji; Zhao, Biqiang; Ning, Baiqi; Yoshikawa, A. (Journal of Geophysical Research: Space Physics, 2014-08-27)
    "Multiple instrumental observations including GPS total electron content (TEC), foF2 and hmF2 from ionosondes, vertical ion drift measurements from Communication/Navigation Outage Forecasting System, magnetometer data, and ...
  • Woodman, Ronald F.; Kudeki, Erhan (Instituto Geofísico del Perú, 1984-12)
    "Experimental evidence for a causal relationship between lightning and explosive equatorial spread F is presented. It is proposed that explosive spread F is produced by rapidly growing plasma instabilities, which are ...
  • Woodman, R. F.; Kugel, R.P.; Röttger, J. (Instituto Geofísico del Perú, 1980-03)
    "The 53.5-MHz radar of the Max-Planck-Institut für Aeronomie (SOUSY-VHF-Radar) was specifically designed for the study of the dynamics of the troposphere, stratosphere, and mesosphere including turbulence and other small-scale ...
  • Oyekola, O. S.; Ojo, Akin; Akinrimisi, J. (Radio Science, 2008-01-12)
    "Nighttime F region vertical electrodynamic drifts were made at the magnetic equatorial stations in Africa, Ibadan (7.4°N, 3.9°E; 6°S dip), and Ouagadougou (12°N, 1.5°W; 5.9°N dip) using ionosondes hmF2 data during 1957/1958 ...
  • Maekawa, Yasuyuki; Aso, Takehiko; Róttger, Jürgen; Czechowsky, Peter; Rüster, Rüdiger; Schmidt, Gerhard; Hirota, Isamu; Woodman, Ronald F.; Kato, Susumu (1986-04)
    A cooperative synchronous observation of winds in the tropical lower stratosphere and mesosphere was carried out using VHF radars at Jicamarca (11.95°S, 76.87°W) and at Arecibo (18.35°N, 66.75°W) on 19-21 or 23 November ...
  • Woodman, R. (1977-02-03)
    It is well known that the optimum signal to noise ratio in a radar is obtained when the receiver response is matched to the transmitter pulse shape. A matched receiver has an impulse response, g(t), equal to the negative ...
  • Ragaini, Enrico; Woodman, Ronald F. (1995)
    This paper proposes a technique for processing signals in which the relevant feature consists of the shape and position of narrow doppler spectral lines. The proposed technique is the digital version of a quadrature ...
  • Huggel, Christian; Scheel, Marlene; Albrecht, Franziska; Andres, Norina; Calanca, Pierluigi; Jurt, Christine; Khabarov, Nikolay; Mira-Salama, Daniel; Rohrer, Mario; Salzmann, Nadine; Silva, Yamina; Silvestre, Elizabeth; Vicuña, Luis; Zappa, Massimiliano (Instituto Geofísico del Perú, 2014-12)
    "As significant impacts of climate change are increasingly considered unavoidable, adaptation has become a policy priority. It is generally agreed that science is important for the adaptation process but specific guidance ...
  • Woodman, Ronald F. (Instituto Geofísico del Perú, 1991-01)
    "Some basic functional relationships between the statistics of the signals received in a radar and the statistics of the density fluctuations of a scattering medium are derived. They vary in their degree of generality, but ...
  • Sheth, R.; Kudeki, E.; Guo, L.; Lehmacher, G.; Sarango, M.; Woodman, R.; Chau, J.; Reyes, P. (Instituto Geofísico del Perú, 2006-07-03)
    "Correlation studies performed on data from recent mesospheric experiments conducted with the 50-MHz Jicamarca radar in May 2003 and July 2004 are reported. The study is based on signals detected from a combination of ...
  • Valladares, C. E.; Sheehan, R.; Villalobos, J. (Instituto Geofísico del Perú, 2004-02)
    "Abstract: Five GPS receivers have been deployed near the 74°W longitude meridian to measure the variability of total electron content (TEC) latitudinal profiles and to study the relation of this variability with the onset ...
  • Villegas-Lanza, J. C.; Nocquet, J. M.; Rolandone, F.; Vallée, M.; Tavera, H.; Bondoux, F.; Tran, T.; Martin, X.; Chlieh, M. (Instituto Geofísico del Perú, 2016-02)
    "In subduction zones, stress is released by earthquakes and transient aseismic slip. The latter falls into two categories: slow slip and afterslip. Slow-slip events emerge spontaneously during the interseismic phase, and ...
  • Milla, Marco A.; Kudeki, Erhan; Reyes, Pablo M.; Chau, Jorge L. (Instituto Geofísico del Perú, 2013-12)
    "A multi-beam incoherent scatter radar technique has been developed at the Jicamarca Radio Observatory in order to maximize the number of ionospheric parameters that can be estimated simultaneously. The technique interleaves ...
  • Sarango, Martin F.; Woodman, Ronald F.; Ragaini, Enrico; Vásquez, Edilberto H. (Instituto Geofísico del Perú, Radio Observatorio de Jicamarca, 1995)
    This paper describes a signal processing and control system for atmospheric sounding rardars, with improved characteristics with respect to formerly used architectures. We refer especially to wind profiling as an important ...
  • Hysell, D. L.; Milla, M. A.; Vierinen, J. (Instituto Geofísico del Perú, 2016-05-04)
    "A small network of HF beacon transmitters and receivers has been deployed in Peru for specifying the F region ionosphere in the sector. The effort is motivated by ionospheric disturbances associated with equatorial spread ...
  • Woodman, Ronald (1964-01-17)
    The characteristics of a servo phase-lock tracking filter is described herein. The filter tracks a 100 cps carrier with a bandwidth of either 0.3 cps or 0.03 cps. The advantages of this type filter and its use is also discussed.
  • Pham, Viet-Cuong; Juang, Jyh-Ching (Journal of Atmospheric and Solar-Terrestrial Physics, 2015-10-19)
    "Abel inversion techniques have been widely employed to retrieve electron density profiles (EDPs) from radio occultation (RO) measurements, which are available by observing Global Navigation Satellite System (GNSS) satellites ...
  • Kudeki, Ethan; Bhattacharyya, Santanu; Woodman, Ronald F. (Instituto Geofísico del Perú, 1999-12-01)
    "Since 1996 incoherent scatter F region plasma drift measurements at Jicamarca have been implemented using a new signal processing approach replacing the traditional pulse-to-pulse correlation method. The new method, based ...
  • Liu, L.; Luan, X.; Wan, W.; Ning, B.; Lei, J. (Annales Geophysicae, 2003-11-30)
    "A new approach is developed to derive dynamic information near the peak of the ionospheric F-layer from ionosonde measurements. This approach avoids deducing equivalent winds from the displacement of the observed peak ...
  • Lobo Gomes, Aiara; Magalhães, Antônio Mário; Pereyra, Antonio; Vilega Rodrigues, Cláudia (Instituto Geofísico del Perú, 2015-06-10)
    "We present a new optical polarimetric catalog for the Small Magellanic Cloud (SMC). It contains a total of 7207 stars, located in the northeast (NE) and Wing sections of the SMC and part of the Magellanic Bridge. This new ...

Buscar en el Repositorio

Listar

Mi cuenta