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dc.contributor.author Yizengaw, E.
dc.contributor.author Zesta, E.
dc.contributor.author Moldwin, M. B.
dc.contributor.author Damtie, B.
dc.contributor.author Mebrahtu, A.
dc.contributor.author Valladares, C. E.
dc.contributor.author Pfaff, R. F.
dc.date.accessioned 2018-11-09T11:04:02Z
dc.date.available 2018-11-09T11:04:02Z
dc.date.issued 2012-07-19
dc.identifier.citation Yizengaw, E., Zesta, E., Moldwin, M. B., Damtie, B., Mebrahtu, A., Valladares, C. E., & Pfaff, R. F. (2012). Longitudinal differences of ionospheric vertical density distribution and equatorial electrodynamics.==$Journal of Geophysical Research: Space Physics, 117$==(A7), A07312. https://doi.org/10.1029/2011JA017454 es_ES
dc.identifier.uri http://hdl.handle.net/20.500.12816/3485
dc.description.abstract Accurate estimation of global vertical distribution of ionospheric and plasmaspheric density as a function of local time, season, and magnetic activity is required to improve the operation of space‐based navigation and communication systems. The vertical density distribution, especially at low and equatorial latitudes, is governed by the equatorial electrodynamics that produces a vertical driving force. The vertical structure of the equatorial density distribution can be observed by using tomographic reconstruction techniques on ground‐based global positioning system (GPS) total electron content (TEC). Similarly, the vertical drift, which is one of the driving mechanisms that govern equatorial electrodynamics and strongly affect the structure and dynamics of the ionosphere in the low/midlatitude region, can be estimated using ground magnetometer observations. We present tomographically reconstructed density distribution and the corresponding vertical drifts at two different longitudes: the East African and west South American sectors. Chains of GPS stations in the east African and west South American longitudinal sectors, covering the equatorial anomaly region of meridian ∼37°E and 290°E, respectively, are used to reconstruct the vertical density distribution. Similarly, magnetometer sites of African Meridian B‐field Education and Research (AMBER) and INTERMAGNET for the east African sector and South American Meridional B‐field Array (SAMBA) and Low Latitude Ionospheric Sensor Network (LISN) are used to estimate the vertical drift velocity at two distinct longitudes. The comparison between the reconstructed and Jicamarca Incoherent Scatter Radar (ISR) measured density profiles shows excellent agreement, demonstrating the usefulness of tomographic reconstruction technique in providing the vertical density distribution at different longitudes. Similarly, the comparison between magnetometer estimated vertical drift and other independent drift observation, such as from VEFI onboard Communication/Navigation Outage Forecasting System (C/NOFS) satellite and JULIA radar, is equally promising. The observations at different longitudes suggest that the vertical drift velocities and the vertical density distribution have significant longitudinal differences; especially the equatorial anomaly peaks expand to higher latitudes more in American sector than the African sector, indicating that the vertical drift in the American sector is stronger than the African sector. es_ES
dc.format application/pdf es_ES
dc.language.iso eng es_ES
dc.publisher American Geophysical Union es_ES
dc.relation.ispartof urn:issn:2169-9380
dc.rights info:eu-repo/semantics/restrictedAccess es_ES
dc.subject Tomography es_ES
dc.subject Vertical drift es_ES
dc.subject Ionosphere es_ES
dc.subject Radar es_ES
dc.title Longitudinal differences of ionospheric vertical density distribution and equatorial electrodynamics es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.subject.ocde http://purl.org/pe-repo/ocde/ford#1.05.01 es_ES
dc.identifier.journal Journal of Geophysical Research: Space Physics es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi https://doi.org/10.1029/2011JA017454 es_ES

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