Journal ArticleDOI
Average equatorial zonal and vertical ion drifts determined from San Marco D electric field measurements
Abstract:
San Marco D electric field measurements have been averaged in terms of their equivalent ion drift to produce an average pattern of equatorial zonal and vertical ion drifts. Variations with season, solar activity, Kp, lunar phase and longitude have been analyzed. Similarities and some differences from previous Jicamarca, DE 2 and AE-E results are seen. Confirmation is given of the dominance of the F region dynamo in the 1900-2100 local time region. The daytime zonal ion drift is larger for high F10.7 values than that for low values. There is little variation between high and low values of Kp. Superrotation is evident in this data set and is larger at equinox compared to solstice. At the June solstice there are significant differences between the average ion drifts in the longitude sector where the geomagnetic equator is north of the geographic equator (Indian sector) and the sector where the geomagnetic equator is south of the geographic equator (Peruvian sector). The daytime upward velocity is larger in the Indian sector than in the Peruvian sector, and it reverses later in the evening in the Indian sector. Daytime westward zonal velocities are larger and the nighttime eastward velocities are smaller in the Indian sector. A presunrise enhancement is seen in the downward velocity in the Indian sector but not in the Peruvian sector. Significant variations are also seen with the phase of the moon. In light of current theory, the lunar variations suggest a complex interaction of E and F region dynamo sources with conductivity, changing in phase and character with latitude.read more
Citations
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Journal ArticleDOI
Radar and satellite global equatorial F-region vertical drift model
Ludger Scherliess,Bela G. Fejer +1 more
TL;DR: In this article, the authors present a global empirical model for the F region equatorial vertical drifts based on combined incoherent scatter radar observations at Jicamarca and Ion Drift Meter observations on board the Atmospheric Explorer E satellite.
Journal ArticleDOI
Quiet time equatorial F region vertical plasma drift model derived from ROCSAT‐1 observations
TL;DR: In this article, the authors used five years of measurements on board the ROCSAT-1 satellite to develop a detailed quiet time global empirical model for equatorial F region vertical plasma drifts, which describes the local time, seasonal and longitudinal dependence of the vertical drifts for an altitude of 600 km under moderate and high solar flux conditions.
Journal ArticleDOI
The electrodynamics of the low-latitude ionosphere: Recent results and future challenges
TL;DR: In this article, the authors examined the present understanding of low-latitude F-region electrodynamics focusing on the large-scale distribution of the ionospheric electric fields and their response to magnetospheric disturbances.
Journal ArticleDOI
Modeling investigation of the evening prereversal enhancement of the zonal electric field in the equatorial ionosphere
TL;DR: In this article, a flux-tube-integrated model of ionospheric electrodynamics is used to examine three proposed causes of the prereversal enhancement of the zonal electric field.
Journal ArticleDOI
Observations of DC electric fields in the low‐latitude ionosphere and their variations with local time, longitude, and plasma density during extreme solar minimum
Robert F. Pfaff,Douglas E. Rowland,Henry Freudenreich,Kenneth R. Bromund,Guan Le,Mario H. Acuña,Jeffrey Klenzing,C. Liebrecht,S. Martin,William J. Burke,N. C. Maynard,Donald E. Hunton,Patrick A. Roddy,John O. Ballenthin,Gordon R. Wilson +14 more
TL;DR: In this article, the C/NOFS double-probe experiment on the satellite during extreme solar minimum conditions near the June 2008 solstice is shown to be highly variable, with weak to moderate ambient amplitudes of ∼1 −2 mV/m (∼25 −50 m/s).
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Average vertical and zonal F region plasma drifts over Jicamarca
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TL;DR: Incoherent scatter observations of vertical drifts taken at Jicamarca (2° dip) are presented in this paper, where the effect of geomagnetic activity is discussed.
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