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Browsing Artículos Científicos by Subject "Aeronomy"
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Item Restricted Jicamarca incoherent and coherent scatter radar capabilities for equatorial aeronomy(European Geosciences Union, 2005) Chau Chong Shing, Jorge Luis; Hysell, D.L."The International Symposium on Equatorial Aeronomy is held approximately every three to four years and is typically a major gathering of scientists from around the world interested in the low-latitude atmosphere and ionosphere, as well as coupling with other latitudinal and altitudinal regions. Each ISEA represents an opportunity for researchers to share their most recent results as well as discuss possibilities for future campaigns and experiments. Over 130 scientists attended ISEA-11 from 15 countries, participating in eight different scientific sessions. The sessions were: (1) K. C. Yeh memorial session: F-region irregularities and scintillations, radio occultation and tomographic imaging; (2) Upper atmospheric responses to seismic and volcanic activities; (3) Equatorial and low-latitude studies: ionospheric and thermospheric dynamics; (4) Numerical simulation, modeling and data assimilation; (5) Magnetic storm effects and space weather features at low latitudes; (6) E-region plasma irregularities and instabilities; (7) Equatorial and low-latitude studies: middle atmosphere dynamics and coupling processes; (8) Experimental techniques and recent low-latitude campaigns."Item Restricted The August 2011 URSI World Day campaign: Initial results(Elsevier, 2015-11) Immel, Thomas J.; Liu, Guiping; England, Scott L.; Goncharenko, Larisa P.; Erickson, Phillip J.; Lyashenko, Mykhaylo V.; Milla, Marco; Chau Chong Shing, Jorge Luis; Frey, Harald U.; Mende, Stephen B.; Zhou, Qihou; Stromme, Anja; Paxton, Larry J.During a 10-day URSI World Day observational campaign beginning on August 1, 2011, an isolated, major geomagnetic storm occurred. On August 5, Kp reached values of 8− and Dst dropped to −113 nT. The occurrence of this isolated storm in the middle of a 10-day URSI World Day campaign provides and unprecedented opportunity to observe the coupling of solar wind energy into the magnetosphere and to evaluate the varied effects that occur in the coupled magnetosphere–ionosphere–thermosphere system. Dramatic changes in the ionosphere are seen at every one of the active radar stations, extending from Greenland down to equatorial Peru in the American sector and at middle latitudes in Ukraine. Data from TIMED and THEMIS are shown to support initial interpretations of the observations, where we focus on processes in the middle latitude afternoon sector during main phase, and the formation of a dense equatorial ionosphere during storm recovery. The combined measurements strongly suggest that the changes in ionospheric conditions observed after the main storm phase can be attributed in large part to changes in the stormtime thermosphere. This is through the generation of disturbance dynamo winds and also global neutral composition changes that either reduce or enhance plasma densities in a manner that depends mainly upon latitude. Unlike larger storms with possibly more sustained forcing, this storm exhibits minimal effects of persistent meridional stormtime wind drag, and little penetration of solar wind electric potentials to low latitudes. It is, therefore, an outstanding example of an impulsive event that exhibits longer-term effects through modification of the background atmosphere.Item Open Access The ST radar under construction at Piura, Peru (6°S, 81°W)(Instituto Geofísico del Perú, 1989) Balsley, B.B.; Ecklund, W.L.; Carter, D.A.; Gage, K.S.; Mugica, R.; Mabres, A.; Rodriguez, R.; Avery, S.K.; Violette, J.; Woodman Pollitt, Ronald FranciscoThe Piura ST radar currently under construction at the Universite de Piura in Piura, Peru will be a 50 MHz VHF system. This radar will form the easternmost facility in the proposed trans-Pacific network of ST radars that will eventually span the equatorial Pacific. Support for the construction of the Piura radar is being furnished by the U.S. National Science Foundation. The ST radar at Piura is part of a cooperative research program involving NOAA's Aeronomy Laboratory and the University of Colorado in the United States and the Universite de Piura and the Instituto Geofísica del Peru in Peru. The radar is being constructed on the campus of the Universite de Piura. A container filled with antenna cables and radar hardware was shipped from Alaska during the past few months. Site preparations are now underway and the antenna construction will begin about the first of the year. A building will be constructed next to the antenna site to house the radar equipment. A diesel generator has been purchased to provide a continuous source of power to the radar. The first phase of construction will be completed by mid-1989 and the radar will be operated for the first year in a vertical-only mode. During 1990 the radar will be modified so that horizontal as well as vertical velocities can be measured.