Browsing by Author "Calderon, C."
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Item Restricted F region east-west drifts at Jicamarca(American Geophysical Union, 1981-01-01) Fejer, B. G.; Farley, D. T.; Gonzales, C. A.; Woodman Pollitt, Ronald Francisco; Calderon, C.F region east-west drifts have been measured at Jicamarca for almost 10 years, using incoherent scatter. The drifts are westward during the day and eastward at night. The daytime drift velocities are about 50 m/s and change very little with season or solar cycle. The evening reversal occurs at about 1600 local time throughout the solar cycle. The maximum nighttime eastward drifts are about 105 and 130 m/s during solar minimum and maximum, respectively. The daytime and nighttime drifts show very litle variation with magnetic activity. These Jicamarca incoherent scatter results (especially the reversal times) differ appreciably from results obtained using other techniques, but there appear to be fairly simple explanations for the apparent disagreements.Item Open Access F-region electril fields: Observational aspects(Max-Plank Institute für Aeronomie, 1976) Woodman Pollitt, Ronald Francisco; Calderon, C.Equatorial electric field measurements were recently reviewed by B. Balsley on occasion of the last equatorial symposium. We present in this review new measurements reported in the literature since the last symposium and include a large amount of new unpublished measurements of the vertical and East-West electric fields performed at Jicamarca using the incoherent scatter technique. The data base at Jicamarca comprises now almost a full solar cycle. The effects of low solar activity are discussed. The main effects being: (1) A reduction in the night-time maximum amplitude of the E-W drift; (2) an increase in the frequency of occurrence of afternoon reversals of the vertical drift (E-W electric field); (3) a reduction in the amplitude and frequency of occurrence in the prereversal (post-sunset) vertical drift enhancement.