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dc.contributor.author Oyekola, O. S.
dc.contributor.author Ojo, Akin
dc.contributor.author Akinrimisi, J.
dc.date.accessioned 2018-10-31T16:57:49Z
dc.date.available 2018-10-31T16:57:49Z
dc.date.issued 2008-01-12
dc.identifier.issn 1944-799X
dc.identifier.uri http://repositorio.igp.gob.pe/handle/IGP/3261
dc.description En: Radio Science, v. 43, n. 1, (February 2008), p. RS1005 1-13.
dc.description.abstract "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 International Geophysical Year (IGY) and 1990 periods, respectively; for high solar flux and geomagnetic quiet time conditions. We compare the seasonal averages of vertical drifts with observations made by Incoherent Scatter Radar (ISR) at Jicamarca (11.95°S, 76.87°W; 2°N dip) and Atmospheric Explorer E (AE‐E) satellite for equatorial F layer vertical drifts reported by Fejer et al. (1995). The results indicate good accord between the three techniques at periods when convection dominates other factors (e.g., around prereversal enhancement) except for June solstice drifts. However, when the drifts are completely downward (negative) between 2000 and 0500 LT sector, the mean discrepancies between ionosondes and ISR drifts are of 8–11 m/s (December solstice), 14–17 m/s (equinoxes) but comparable during June solstice with a value of about 14 m/s. Conversely, the typical values of the differences among ionosondes and AE‐E downward velocities are 7–10 m/s (December solstice), 9–12 m/s (equinoxes), yet again similar in winter with a significantly smaller value of about 3 m/s. The evening reversal times are in excellent agreement, apart from June solstice drifts, which exhibits large fluctuations. The morning reversal times show small variations. Equinoctial prereversal enhancement velocities have amplitudes of approximately 17–35 m/s between the methods. Our data are useful for global ionospheric modeling and for the predictions of development of nighttime equatorial F region irregularities at the African region where there is paucity of data". es_ES
dc.format application/pdf es_ES
dc.language.iso en es_ES
dc.publisher Radio Science es_ES
dc.rights info:eu-repo/semantics/restrictedAccess es_ES
dc.rights.uri http://creativecommons.org/licences/restrictedAccess es_ES
dc.source Repositorio institucional - IGP es_ES
dc.subject Región F es_ES
dc.subject Ionósfera--Observaciones es_ES
dc.subject Ionósfera--Investigación es_ES
dc.subject Ionosondas es_ES
dc.subject Radar de dispersión incoherente es_ES
dc.subject Radar--Perú--Observaciones es_ES
dc.subject Satélites artificiales es_ES
dc.subject Ciclo solar es_ES
dc.subject Actividad solar es_ES
dc.subject Geomagnetismo es_ES
dc.title A comparison of ground and satellite observations of F region vertical velocity near the dip equator es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.subject.ocde Atmósfera es_ES
dc.subject.ocde Observación es_ES
dc.subject.ocde Radar es_ES
dc.subject.ocde Investigación es_ES
dc.subject.ocde Geofísica es_ES
dc.subject.ocde Perú es_ES
dc.subject.ocde África es_ES
dc.subject.ocde Nigeria es_ES
dc.subject.ocde Burkina Faso es_ES
dc.identifier.journal Radio science es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi 10.1029/2007RS003699 es_ES

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