@Article{FejerPaulScheBati:1996:InScRa,
               author = "Fejer, B. G. and Paula, Eurico Rodrigues de and Scherliess, Ludger 
                         and Batista, Inez Staciarini",
                title = "Incoherent scatter radar, ionosonde, and satellite measurements of 
                         equatorial F region vertical plasma drifts in the evening sector",
              journal = "Geophysical Research Letters",
                 year = "1996",
               volume = "24",
               number = "14",
                pages = "1733--1736",
                month = "July",
             keywords = "AERONOMIA, IONOSFERA, RADAR DE ESPALHAMENTO COERENTE, IONOSSONDA, 
                         SONDAGEM IONOSFERICA, REGIAO F, PLASMA IONOSFERICO.",
             abstract = "Studies of equatorial F region evening vertical plasma drifts 
                         using different measurement techniques have produced conflicting 
                         results. We examine the relationship of incoherent scatter radar 
                         and ionosonde drift observations over the Peruvian equatorial 
                         region, and AE-E satellite drifts for different geophysical 
                         conditions. Our data show that there is large day-to-day 
                         variability on the ratios of radar and ionosonde drifts, but on 
                         the average the measurements from these two techniques are in fair 
                         agreement during low and moderate solar flux conditions. For high 
                         solar activity, however, the Jicamarca evening drifts during 
                         equinox and December solstice are significantly larger than the 
                         ionosonde drifts. These results can be explained by the different 
                         height ranges of the radar and ionosonde measurements, and the 
                         increase of the upward drift velocity with height below the F 
                         region peak. This altitudinal variation is related to the 
                         longitudinal gradient of the zonal plasma drifts as a result of he 
                         curl-free electric field condition. Our results also indicate that 
                         during equinox the increase of the vertical prereversal velocity 
                         enhancement with solar activity is largely longitude 
                         independent.",
                 issn = "0094-8276",
                label = "8741",
           targetfile = "7445.pdf",
        urlaccessdate = "03 maio 2024"
}